CN108987752A - Positive plate, preparation method thereof and lithium ion battery - Google Patents
Positive plate, preparation method thereof and lithium ion battery Download PDFInfo
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- CN108987752A CN108987752A CN201710404374.3A CN201710404374A CN108987752A CN 108987752 A CN108987752 A CN 108987752A CN 201710404374 A CN201710404374 A CN 201710404374A CN 108987752 A CN108987752 A CN 108987752A
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- H01M4/00—Electrodes
- H01M4/02—Electrodes composed of, or comprising, active material
- H01M4/62—Selection of inactive substances as ingredients for active masses, e.g. binders, fillers
- H01M4/628—Inhibitors, e.g. gassing inhibitors, corrosion inhibitors
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- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/05—Accumulators with non-aqueous electrolyte
- H01M10/052—Li-accumulators
- H01M10/0525—Rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodes; Lithium-ion batteries
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- H01M4/02—Electrodes composed of, or comprising, active material
- H01M4/04—Processes of manufacture in general
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- H01M4/13—Electrodes for accumulators with non-aqueous electrolyte, e.g. for lithium-accumulators; Processes of manufacture thereof
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Abstract
The invention discloses a positive plate, which comprises a positive current collector and a positive slurry layer coated on the surface of the positive current collector, wherein the positive slurry layer comprises a positive active material and a plate additive, and the plate additive comprises a double-bond cyclic sultone compound. Compared with the prior art, the positive plate prepared by the method has good interface stability, and the lithium ion battery containing the positive plate has excellent high-temperature storage performance, low-temperature direct-current internal resistance, low-temperature lithium precipitation performance and high-temperature thermal stability. In addition, the invention also discloses a preparation method of the positive plate, which has simple process and easy operation and is suitable for large-scale production.
Description
Technical field
The invention belongs to field of lithium ion battery, it is more particularly related to a kind of positive plate and preparation method thereof
And lithium ion battery.
Background technique
Lithium ion battery is due to having the characteristics that energy density is high, having extended cycle life, pollution-free, so that it is in consumer electricity
It has broad application prospects on son, power vehicle battery and accumulation power supply.
Demand with people to lithium ion battery energy density is higher and higher, cruising ability of the people to lithium ion battery
Higher requirements are also raised.In order to improve the energy density of lithium ion battery, the lithium ion battery with height ratio capacity is developed
Positive electrode is one of effective way.Currently, nickelic positive electrode due to its theoretical specific capacity height make its become research hotspot,
However nickel tenor is very high so that it is easy to cause electrolyte in positive table with very strong oxidisability in nickelic positive electrode
Electrochemical oxidation reactions occur for face, while causing the variation of nickelic cathode material structure, eventually lead to the transition metal such as nickel, cobalt hair
Raw reduction reaction and dissolve out, cause the deterioration of lithium ion battery chemical property, especially high-temperature storage performance and high warm steady
Qualitatively deteriorate.
Effectively inhibiting nickelic positive electrode is to improve high-temperature storage performance of lithium ion battery to the oxygenolysis of electrolyte
It is crucial.In lithium ion battery, improve lithium ion battery as electrolysis additive frequently with 1,3- propene sultone (PST)
High-temperature storage performance, still, PST be easy graphite cathode surface reduction formed the biggish SEI film of impedance, severe exacerbation lithium from
The power-performance of sub- battery.
In view of this, it is necessory to provide a kind of positive plate and preparation method thereof with ideal performance, and include this
The lithium ion battery of positive plate, so that lithium ion battery has excellent high-temperature storage performance, low temperature direct internal resistance, low temperature simultaneously
Analyse lithium performance and high high-temp stability.
Summary of the invention
It is an object of the invention to: overcome the deficiencies of the prior art and provide a kind of positive plate with ideal performance and its
Preparation method, and the lithium ion battery comprising the positive plate, so that lithium ion battery has excellent high temperature storage simultaneously
Energy, low temperature direct internal resistance, low temperature analysis lithium performance and high high-temp stability.
In order to achieve the above-mentioned object of the invention, it the present invention provides a kind of positive plate, including plus plate current-collecting body and is coated in just
The anode sizing agent layer of pole collection liquid surface includes positive electrode active materials and pole piece additive, the pole in the anode sizing agent layer
It include double bond containing cyclic annular sultone compounds in piece additive.
Present inventor is by further investigation discovery: adding using double bond containing cyclic annular sultone compounds as pole piece
Add agent to be added in the anode sizing agent coated in plus plate current-collecting body surface, the oxidation resistent susceptibility of anode can be effectively improved, and not
It will increase the interface impedance of cathode.Positive plate made from this double bond containing cyclic annular sultone compounds is applied to lithium ion
In battery, so that lithium ion battery has excellent high-temperature storage performance, low temperature direct internal resistance, low temperature analysis lithium performance and height simultaneously
Warm stability.
Double bond containing ring-type sultone compounds improve the high temperature of lithium ion battery usually as electrolysis additive
Storage performance, the reason is that double bond containing ring-type sultone compounds can positive electrode surface oxidation polymerization formed one layer it is fine and close
Passivating film improves the oxidative resistance at positive interface, effectively prevents the oxygenolysis of electrolyte, but in double bond containing cyclic annular sulfonic acid
Ester compounds are in addition to that can also form the biggish SEI film of impedance in graphite cathode surface reduction, seriously other than positive oxidation filming
Deteriorate the power-performance of lithium ion battery.In order to overcome double bond containing cyclic annular sultone compounds to cathode interface impedance not
Benefit influences, while not influencing its passivation to positive interface, and present inventor has found by lot of experiments, will contain double
The cyclic annular sultone compounds of key are added in slurry as pole piece additive, are solidificated in it in anode sizing agent layer, are both reached
The oxidation resistent susceptibility for improving anode has been arrived, and not will increase the purpose of cathode interface impedance.
As a kind of improvement of positive plate of the present invention, the general structure of the double bond containing cyclic annular sultone compounds
Are as follows:
Wherein, R is selected from the alkenylene that containing substituent group or the carbon atom number containing substituent group is not 3~6, and substituent group is selected from
The alkyl or halogen that carbon atom number is 1~6.
In above-mentioned general formula I, in the alkyl that carbon atom number is 1~6, the specific type of alkyl is not exposed to specific limit
System, can be selected, for example, chain-like alkyl and naphthenic base, wherein chain-like alkyl includes straight chain alkane again according to actual needs
Base and branched alkyl can contain the substituent group of such as alkyl on the ring of naphthenic base, can also not contain substituent group.
It as the example of alkyl, can specifically enumerate: methyl, ethyl, n-propyl, isopropyl, cyclopropyl, normal-butyl, different
Butyl, sec-butyl, tert-butyl, cyclobutyl, n-pentyl, isopentyl, neopentyl, cyclopenta, n-hexyl, isohesyl, cyclohexyl.
As a kind of improvement of positive plate of the present invention, the double bond containing cyclic annular sultone compounds are selected from general formula (1)
One or more of compound shown in~(8):
As a kind of improvement of positive plate of the present invention, the weight of the double bond containing cyclic annular sultone compounds accounts for anode
The 0.1%~5% of pulp layer total weight, preferably 0.1%~2%, further preferably 0.1%~1%.
When it is 0.1%~5% that double bond containing cyclic annular sultone compounds, which account for the content of anode sizing agent layer total weight, one
Aspect can be effectively improved the oxidative resistance of anode pole piece, significantly improve the high-temperature storage performance of lithium ion battery；On the other hand,
The pole piece additive being solidificated in anode sizing agent layer, which will not be dissolved out obviously in electrolyte, to be diffused into cathode and increases graphite cathode
Interface impedance, thus guarantee battery have good low temperature direct internal resistance, low temperature analysis lithium performance.
It further include conductive agent and binder in the anode sizing agent layer as a kind of improvement of positive plate of the present invention, wherein
The weight of the conductive agent accounts for the 0.5%~3% of anode sizing agent layer total weight, and it is total that the weight of the binder accounts for anode sizing agent layer
The 0.5%~5% of weight.
It has been investigated that being unable to reach good conductive effect when the content of conductive agent is very few；When conductive agent content mistake
When more, the quality of positive electrode active materials in battery can be reduced, to be unfavorable for improving the energy density of lithium ion battery.Work as bonding
When the content of agent is very few, it is unable to reach good bond effect；When binder content is excessive, on the one hand can reduce in battery just
The quality of pole active material, thus be unfavorable for improve lithium ion battery energy density, on the other hand, can reduce positive plate from
Subconductivity increases the polarization in lithium ion battery charge and discharge process, to deteriorate electrical property.
As a kind of improvement of positive plate of the present invention, the weight of the conductive agent account for anode sizing agent layer total weight 1%~
2%, the weight of the binder accounts for the 1%~2% of anode sizing agent layer total weight.
As a kind of improvement of positive plate of the present invention, the conductive agent be selected from conductive black, superconducting carbon black, electrically conductive graphite,
Be vapor-deposited one or more of carbon fiber, acetylene black, carbon nanotube, graphene.
As a kind of improvement of positive plate of the present invention, the conductive agent is selected from superconducting carbon black, electrically conductive graphite, acetylene black, carbon
The one or more of nanotube.
As a kind of improvement of positive plate of the present invention, the conductive agent is superconducting carbon black.
As a kind of improvement of positive plate of the present invention, the binder be selected from polyvinyl alcohol, polyurethane, polyacrylate,
One or more of Kynoar, butadiene-styrene rubber, epoxy resin, vinyl acetate resin and chlorinated rubber.
As a kind of improvement of positive plate of the present invention, the binder is Kynoar.
As a kind of improvement of positive plate of the present invention, the anode sizing agent layer with a thickness of 10 μm~70 μm, preferably 30 μ
M~60 μm, further preferably 40 μm~50 μm.
As a kind of improvement of positive plate of the present invention, the plus plate current-collecting body selects metal foil.
As a kind of improvement of positive plate of the present invention, the plus plate current-collecting body selects silver foil, copper foil or aluminium foil.
As a kind of improvement of positive plate of the present invention, the plus plate current-collecting body selects aluminium foil.
As a kind of improvement of positive plate of the present invention, the plus plate current-collecting body with a thickness of 5 μm~30 μm.
As a kind of improvement of positive plate of the present invention, the plus plate current-collecting body with a thickness of 8 μm~25 μm.
As a kind of improvement of positive plate of the present invention, the plus plate current-collecting body with a thickness of 12 μm~20 μm.
As a kind of improvement of positive plate of the present invention, the plus plate current-collecting body with a thickness of 14 μm.
As a kind of improvement of positive plate of the present invention, the positive electrode active materials are in lithium-containing transition metal oxide
One or more, the lithium-containing transition metal oxide are selected from LiCoO2、LiNixCoyMn(1-x-y)O2、LiNixCoyAl(1-x-y)O2、
LiNixMn1-xO2、LiNiO2、LiMnO2、Li2MnO4One of or it is a variety of, wherein x, y, x+y are respectively less than 1.
As a kind of improvement of positive plate of the present invention, the lithium-containing transition metal oxide is selected from LiCoO2、LiNi1/ 3Co1/3Mn1/3O2、LiNi0.5Co0.2Mn0.3O2、LiNi0.6Co0.2Mn0.2O2、LiNi0.8Co0.1Mn0.1O2、
LiNi0.8Co0.15Mn0.05O2、LiNi1.5Mn0.5O2、LiNiO2、LiMnO2、Li2MnO4One or more of.
As a kind of improvement of positive plate of the present invention, the positive electrode is LiNi0.8Co0.1Mn0.1O2。
In order to achieve the above-mentioned object of the invention, the present invention provides a kind of preparation methods of positive plate, comprising the following steps:
1) positive electrode active materials, conductive agent, binder and double bond containing cyclic annular sultone compounds are added in solvent
Dispersed, obtains anode sizing agent；
2) anode sizing agent for obtaining step 1) is coated in the surface of plus plate current-collecting body, is then dried, obtains anode
Pulp layer；
3) the anode sizing agent layer after will be dry in step 2) successively carries out roll-in, slitting and slice, obtains positive plate.
As a kind of improvement of piece preparation method of the invention positive, the drying temperature is 80 DEG C~110 DEG C, preferably 90
DEG C~100 DEG C.
As a kind of improvement of piece preparation method of the invention positive, in step 1), the solvent is organic solvent, preferably
Ground, the organic solvent is one or more of heterocycle compound, it is further preferred that the organic solvent is selected from tetrahydro
One of furans, pyridine, N-Methyl pyrrolidone and pyrroles are a variety of, and most preferably, the organic solvent is N- methyl
Pyrrolidones.
As a kind of improvement of piece preparation method of the invention positive, in step 2), the anode sizing agent is coated in anode collection
On two surfaces of fluid.
In order to achieve the above-mentioned object of the invention, the present invention also provides a kind of lithium ion batteries comprising positive plate, cathode
Piece, the isolation film and electrolyte being interval between positive plate and negative electrode tab, wherein the positive plate is aforementioned positive electrode piece.
Compared with the existing technology, positive plate provided by the invention can effectively improve the oxidation resistent susceptibility of anode, and will not
The interface impedance for obviously increasing cathode, the lithium ion battery containing positive plate of the present invention have both excellent high temperature storage simultaneously
Energy, low temperature direct internal resistance, low temperature analysis lithium performance and high high-temp stability；The preparation method technique letter of positive plate provided by the invention
It is single, easily operated, it is suitble to large-scale production.
Specific embodiment
In order to be more clear goal of the invention of the invention, technical solution and advantageous effects, with reference to embodiments
The present invention is described in further detail, however, it should be understood that the embodiment of the present invention is of the invention just for the sake of explaining, and
It is non-in order to limit the present invention, and embodiments of the present invention are not limited to the embodiment provided in specification.
Embodiment 1
Positive plate preparation
1) by positive electrode active materials LiNi0.8Co0.1Mn0.1O2(NCM811), conductive agent Super P, binder gather inclined difluoro
Ethylene (PVDF) is uniformly mixed, and solvent N-methyl pyrilidone (NMP) is added and is dispersed, is then added to compound (1)
It is further uniformly dispersed in slurry, obtains anode sizing agent, wherein solid content is 77wt% in anode sizing agent.
2) surface of the anode sizing agent for obtaining step 1) coated in plus plate current-collecting body, the then forced air drying at 90 DEG C,
Obtain anode sizing agent layer；
3) the anode sizing agent layer after will be dry in step 2) successively carries out roll-in, slitting and slice, obtains positive plate.
Negative electrode tab preparation
By negative electrode active material graphite, conductive agent Super P, thickener sodium carboxymethylcellulose (CMC), binder butylbenzene
Rubber latex (SBR) is mixed according to mass ratio 96.4:1.5:0.5:1.6, is added in deionized water, is made in de-airing mixer
It is dispersed with stirring under uniformly, obtains negative electrode slurry, wherein solid content is 54wt% in negative electrode slurry；Negative electrode slurry is uniformly applied
It overlays on negative current collector copper foil and is dried at 85 DEG C, then pass through cold pressing, trimming, cut-parts, slitting, finally at 120 DEG C
Dry 12h, obtains negative electrode tab under vacuum condition.
Electrolyte preparation
In water content < 10ppm argon atmosphere glove box, by ethylene carbonate (EC), methyl ethyl carbonate (EMC) and carbon
Diethyl phthalate (DEC) is that EC:EMC:DEC=30:50:20 is mixed according to mass ratio, then will be abundant as organic solvent
Dry lithium salts LiPF6It is dissolved in mixed organic solvents, pole piece additive is added later, obtains electrolyte after mixing.
Wherein, LiPF6Concentration be 1mol/L.
The preparation of isolation film
Using the polyethylene film (PE) with a thickness of 14 μm as isolation film.
The preparation of lithium ion battery
Positive plate, isolation film, negative electrode tab are folded in order, isolation film is between positive and negative plate and plays isolation
Then effect winds the naked battery core of squarely, naked battery core is fitted into package foil aluminum plastic film by soldering polar ear, then at 80 DEG C
It after toasting water removal, injects corresponding electrolyte and seals, later by standing, heat are cold-pressed, (0.02C constant-current charge arrives for chemical conversion
3.3V, then with 0.1C constant-current charge to the processes such as 3.6V), shaping, volume test, finished product flexible packing lithium ion battery is obtained,
With a thickness of 4.0mm, width 60mm, length 140mm.
Embodiment 2~16 and the test of comparative example 1~7 are substantially the same manner as Example 1, and each embodiment is related to comparative example
Substance classes and content and test result are referring to table 1~3.
The performance test of lithium ion battery
(1) the high-temperature storage performance test of lithium ion battery
Use the initial volume of drainage test lithium ion battery for V0, then by lithium ion battery at room temperature with 1C perseverance
For current charge to 4.2V, constant-voltage charge to electric current is 0.05C, is put into 85 DEG C of insulating box, keeps the temperature 10 days, and survey every taking-up in 1 day
The volume for trying battery is denoted as Vn, and n is the number of days of 85 DEG C of lithium ion battery storages, and the high temperature storage for calculating lithium ion battery produces gas
Expansion rate, the storage after high-temperature lithium ion battery stores n days produce gas expansion rate as=(Vn-V0)/V0 × 100%.
(2) low temperature direct impedance (DCR) test of lithium ion battery
The state-of-charge (SOC) of battery is adjusted when room temperature to the 20% of capacity, and lithium ion battery is then transferred to -25 DEG C
High-low temperature chamber in, stand 2 hours, so that battery temperature is reached -25 DEG C.Then with the multiplying power discharging 10s of 0.3C, before record electric discharge
Voltage afterwards, the voltage before electric discharge are U1, and the voltage after electric discharge is U2, and discharge DCR=(U1-U2)/I.
(3) lithium ion battery low temperature analysis lithium test
At -10 DEG C, lithium ion battery is stood 30 minutes, elder generation is 4.2V with 1C constant-current charge to voltage later, into one
Step is 0.05C with 4.2V constant-voltage charge to electric current, and stands 5 minutes, is then 2.8V with 1C constant-current discharge to voltage, as
Lithium ion battery is recycled 10 times by the above process, is then with 1C constant-current charge to voltage by one charge and discharge cycles process
4.2V.In dry environment, it will charge to the lithium ion battery dismantling of 4.2V, observe the analysis lithium situation of negative terminal surface.Wherein, it analyses
Lithium degree, which is divided into, not to be analysed lithium, slight analysis lithium and seriously analyses lithium, and slight lithium of analysing indicates that the analysis lithium region of negative terminal surface is whole area
/ 10th of domain are hereinafter, seriously analysis lithium indicates that the analysis lithium region of negative terminal surface is more than the one third of overall region or more.
(4) the high high-temp stability test of lithium ion battery
It with 0.5C constant-current charge to voltage is 4.2V by the lithium ion battery of 500 circulations was carried out, into one at 25 DEG C
Step is 0.05C with 4.3V constant-voltage charge to electric current, is then placed in lithium ion battery in 150 DEG C of high temperature furnace and keeps 1h, is observed
The state of lithium ion battery.
The related species and content and drying temperature of table 1 embodiment 1~16 and comparative example 1~7
The test result of table 2 embodiment 1~16 and comparative example 1~7
Interpretation of result
(1) comparative example 1~4 compares
From the comparison of comparative example 1~4 as can be seen that when a small amount of additive compound (1) is added in the electrolytic solution,
It is significantly reduced gas production of the battery at 85 DEG C, improves the high high-temp stability of lithium ion battery, but lithium ion battery
Low temperature direct internal resistance obviously increases, and low temperature analysis lithium situation also obviously deteriorates.
(2) embodiment 1~16 is compared with comparative example 1~4
From the comparison of embodiment 1~16 and comparative example 1~4 as can be seen that by double bond containing cyclic annular sultones chemical combination
Object is added in the anode sizing agent coated in plus plate current-collecting body surface as pole piece additive, may make that lithium ion battery is simultaneous simultaneously
Have excellent high-temperature storage performance, low temperature direct internal resistance, low temperature analysis lithium performance and high high-temp stability.
(3) embodiment 5~7 is compared with comparative example 7
From embodiment 5~7 and comparative example 7 as can be seen that when double bond containing cyclic annular sultone compounds (1) are starched in anode
When too high levels in material, the low temperature direct internal resistance of battery can be increased to a certain extent and impaired low temperature analyses lithium situation.Reason
It is when additional amount is excessive, electrolyte can be dissolved out by being solidificated in the double bond containing cyclic annular sultone compounds inside positive plate,
It is diffused into the interface impedance that negative terminal surface increases graphite cathode.
(4) embodiment 4,15~16 is compared with comparative example 5
From in the comparison of embodiment 4,15~16 and comparative example 5 as can be seen that positive plate drying temperature is in the comparative example 5
At 120 DEG C, even if being added to double bond containing cyclic annular sultone compounds in anode sizing agent layer as pole piece additive, but electric
The production gas and high high-temp stability in pond are not improved, on the contrary, performance is compared with embodiment 4 (90 DEG C), embodiment 15 (100 DEG C)
It is poor with embodiment 16 (110 DEG C).The possible reason is positive plate, since temperature is excessively high, causes in anode sizing agent layer when dry
Double bond containing ring-type sultone compounds are volatilized totally, so that degradation.
(5) embodiment 4,15~16 is compared with comparative example 1,5
Embodiment 4,15~16, the anode pole piece of comparative example 1,5 are used into ICP-OES (inductive coupling-atom after the drying
Emission spectrum) sulfur content in test anode sizing agent layer, test result is shown in Table 3.From table 3 it can be seen that working as 5 positive plate of comparative example
When drying temperature is 120 DEG C, the S that few content is only detected in comparative example 5 exists, and illustrates double bond containing ring in anode sizing agent layer
Shape sultone compounds under 120 DEG C of high temperature substantially volatilization completely, and be lower than 120 DEG C when, still there is the S of high level to deposit
Illustrating that there is no volatilizations completely for double bond containing ring-type sultone compounds in anode sizing agent layer, since additive contains double bond
Cyclic annular sultone compounds presence, can guarantee the properties of battery.
3 ICP-OES of table (inductive coupling-atomic emission spectrum) test result
Compared with the existing technology, positive plate provided by the invention can effectively improve the oxidation resistent susceptibility of anode, and will not
The interface impedance for obviously increasing cathode, the lithium ion battery containing positive plate of the present invention have both excellent high temperature storage simultaneously
Energy, low temperature direct internal resistance, low temperature analysis lithium performance and high high-temp stability；The preparation method technique letter of positive plate provided by the invention
It is single, easily operated, it is suitble to large-scale production.
According to the disclosure and teachings of the above specification, those skilled in the art in the invention can also be to above-mentioned embodiment party
Formula carries out change and modification appropriate.Therefore, the invention is not limited to the specific embodiments disclosed and described above, to this
Some modifications and changes of invention should also be as falling into the scope of the claims of the present invention.In addition, although this specification
In use some specific terms, these terms are merely for convenience of description, does not limit the present invention in any way.
Claims (10)
1. a kind of positive plate, including plus plate current-collecting body and coated in the anode sizing agent layer on plus plate current-collecting body surface, which is characterized in that
Include positive electrode active materials and pole piece additive in the anode sizing agent layer, includes double bond containing ring-type in the pole piece additive
Sultone compounds.
2. positive plate according to claim 1, which is characterized in that the knot of the double bond containing cyclic annular sultone compounds
Structure general formula are as follows:
Wherein, R is selected from the alkenylene that containing substituent group or the carbon atom number containing substituent group is not 3~6, and it is former that substituent group is selected from carbon
The alkyl or halogen that subnumber is 1~6.
3. positive plate according to claim 2, which is characterized in that the double bond containing cyclic annular sultone compounds are selected from
One or more of compound shown in general formula (1)~(8):
4. positive plate according to claim 1, which is characterized in that the weight of the double bond containing cyclic annular sultone compounds
Amount accounts for the 0.1%~5% of anode sizing agent layer total weight, preferably 0.1%~2%, further preferably 0.1%~1%.
5. positive plate according to claim 1, which is characterized in that further include conductive agent and bonding in the anode sizing agent layer
Agent, wherein the weight of the conductive agent accounts for the 0.5%~3% of anode sizing agent layer total weight, and the weight of the binder accounts for anode
The 0.5%~5% of pulp layer total weight.
6. positive plate according to claim 1, which is characterized in that the anode sizing agent layer with a thickness of 10 μm~70 μm,
Preferably 30 μm~60 μm, further preferably 40 μm~50 μm.
7. positive plate according to claim 1, which is characterized in that the positive electrode active materials are selected from lithium-containing transition metal oxygen
One or more of compound, the lithium-containing transition metal oxide are selected from LiCoO2、LiNixCoyMn(1-x-y)O2、
LiNixCoyAl(1-x-y)O2、LiNixMn1-xO2、LiNiO2、LiMnO2、Li2MnO4One of or it is a variety of, wherein x, y, x+y are equal
Less than 1.
8. a kind of method for preparing the described in any item positive plates of claim 1~7, which comprises the following steps:
1) positive electrode active materials, conductive agent, binder and double bond containing cyclic annular sultone compounds are added in solvent and are carried out
Dispersion obtains anode sizing agent；
2) anode sizing agent for obtaining step 1) is coated in the surface of plus plate current-collecting body, is then dried, obtains anode sizing agent
Layer；
3) the anode sizing agent layer after will be dry in step 2) successively carries out roll-in, slitting and slice, obtains positive plate.
9. the preparation method of positive plate according to claim 8, which is characterized in that the drying temperature is 80 DEG C~110
DEG C, preferably 90 DEG C~100 DEG C.
10. a kind of lithium ion battery comprising positive plate, negative electrode tab, the isolation film being interval between positive plate and negative electrode tab, with
And electrolyte, which is characterized in that the positive plate is positive plate described in claim 1~7.
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Application publication date: 20181211 |