CN102339981A - Lithium ion battery and anode thereof - Google Patents
Lithium ion battery and anode thereof Download PDFInfo
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- CN102339981A CN102339981A CN2011102854648A CN201110285464A CN102339981A CN 102339981 A CN102339981 A CN 102339981A CN 2011102854648 A CN2011102854648 A CN 2011102854648A CN 201110285464 A CN201110285464 A CN 201110285464A CN 102339981 A CN102339981 A CN 102339981A
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Abstract
The invention discloses preparation and application of a lithium ion battery anode with high energy density and high safety. The anode at least comprises two kinds of anode active materials A and B, wherein A has the characteristic of high energy density, and B has slightly low energy density and higher safe property; a cathode material with both high energy density and good safety property can be prepared by mixing and using A and B in different manners, and a lithium ion battery with both high energy density and good safety property can be prepared by collocating the cathode material with an anode material.
Description
Technical field
The present invention relates to technical field of lithium ion, refer in particular to a kind of high-energy-density and high security lithium ion cell positive preparation and use the lithium ion battery of this positive pole preparation.
Background branch art
Lithium ion battery is as a kind of secondary cell of environmental protection, obtained extensive use in fields such as portable set such as mobile phone, video camera, notebook computers.Yet along with development of modern society, numerous portable sets all stride forward to intelligent, multifunction, in order to satisfy its requirement to capacity and power, guarantee the service time that it is sufficient, require its power source must have higher energy density.Simultaneously, along with the expansion in lithium ion battery applications field, the consumer has higher requirement to the security performance of lithium ion battery.
The cathode material of the high-energy-density that uses at present mainly is chosen as LiCoO
2But LiCoO
2Along with the transition metal dissolving takes place easily for the rising of charging voltage and temperature, the structure of material is damaged, and then destroys the chemical property and the security performance of battery, influences the performance and the actual life of lithium ion battery.And the manganese cathode material environmental friendliness, China's manganese aboundresources, low price.The manganese based material of report comprises spinel-type LiMn
2O
4, spinel-type Li
2Mn
2O
4, iris shape LiMnO
2, stratiform LiMnO
2, LiNi
xMn
yCo
1-x-yO
2Deng.LiMn wherein
2O
4, iris shape LiMnO
2With stratiform Mn sill such as LiNi
xMn
yCo
1-x-yO
2And LiMn
1-xNi
xO
2The most potential, like spinel lithium manganate LiMn
2O
4The redox temperature of material has very high security performance up to 250 ℃, but this type material compacted density is less, and energy density is on the low side.If make the LiCoO of high-energy-density
2The Mn sill high with security performance effectively combines through certain way; Can make the positive electrode of high-energy-density and high safety performance; The negative material of collocation high-energy-density just can be prepared the lithium ion battery that has high-energy-density and high safety performance concurrently.
Summary of the invention:
One of the object of the invention is to provide a kind of lithium ion cell positive, and this lithium ion cell positive can satisfy the requirement of high-energy-density and high safety performance simultaneously.In order to solve above-mentioned technical problem, adopt following technical scheme among the present invention first:
A kind of lithium ion cell positive comprises collector, and attached to the active material on the collector, described active material contains active material A and active material B;
Described active material A has the Li of high-energy-density
1+xCoO
2, Li
1+xNiO
2, Li
1+xNi
0.8Co
0.15M
0.05O
2(M=Al, Mg, Cr, Mn), Li
1+xCo
1-yNi
yO
2In (wherein :-0.3≤x≤0.3, y≤0.3) one or several;
Said active material B has the Li of high safety performance
zMn
2O
4, Li
zMnO
2, Li
zMn
1-xNi
xO
2, Li
zNi
xMn
yM
1-x-yO
2, wherein M can be any one or several kinds among Co, Al, Mg, Cr, Ti, Zr, Pt, Au, Pd, Ce, Pr, the Nd, x ≈ y≤0.5 wherein, x+y≤1,0.95≤z≤1.10;
The mass ratio of wherein said active material A and active material B is 1～19.
Said active material B is Li
zNi
xMn
yM
1-x-yO
2, wherein M can be any one perhaps several kinds among Co, Al, Mg, Cr, Ti, Zr, Pt, Au, Pd, Ce, Pr, the Nd, wherein 0.3≤x ≈ y≤0.45,0.95≤z≤1.05.
Active material comprises graphite, hard carbon, CNT in the said negative pole, Graphene etc., metal nitride, Sn base alloy, Si base alloy, Sn-C compound, Si-C compound, SnO/SnO
2, SiO
x, SbO
xIn any one or several kinds, 0.5＜x＜2 wherein.
Described charging voltage platform is at 4.20～4.60V; Being coated on outer field active material B can stop active material A directly to contact with electrolyte; Prevent the A material under high potential with electrolyte in HF reaction cause the transition metal dissolving, material structure subsides, and improves anodal structural stability.
A kind of lithium ion cell positive, the preparation method of said positive pole does, active material A evenly mixed with active material B ball milling, wherein, the granule of the preferred 0.5～10um of active material B and behind ball milling, can evenly be coated on the surface of active material A; At high temperature carry out sintering then, with the active material of gained and binding agent, conductive carbon, be mixed into slurry then, then slurry is coated on the plus plate current-collecting body, the oven dry back forms anodal.The lithium ion cell positive of this kind method preparation, its positive electrode B is even must to be wrapped in positive electrode A surface, in charge and discharge process, can play and avoid positive electrode A material directly to contact with electrolyte, plays the effect of protection A material structure.Simultaneously, this kind method is directly taken A, the B material carries out mix grinding, and can be through regulating the granularity of A, B material, and additional proportion is regulated the thickness and the covering amount of B material coating layer, and technology is simple, and process is controlled easily.
A kind of lithium ion cell positive; The preparation method of said positive pole does; Precursor with active material A evenly mixes with the precursor ball milling of active material B earlier; Wherein, the granule precursor of the preferred 0.5～10um of active material B and behind ball milling, can evenly be coated on the precursor surface of active material A is with adding lithium salts in the gained mixture; Lithium salts comprises: Li
2CO
3, LiOH, LiNO
3In one or more; The ratio of lithium salts is: 0.95≤Li: (Ni+Mn+M)≤1.1, stir, at high temperature carry out sintering then; With the active material of gained and binding agent, conductive carbon; Be mixed into slurry, then slurry be coated on the plus plate current-collecting body, the oven dry back forms anodal.The lithium ion cell positive of this kind method preparation; Not only positive electrode B is wrapped in positive electrode A surface equably; A precursor and B precursor in heat treatment process, according to the Ke Kendaer effect, can pore-creating in materials A and material B; These holes have a transmission that is beneficial to the charge and discharge process intermediate ion, improve the high rate performance of material.Simultaneously, material B is coated on the surface of materials A uniformly, and the particle of the positive electrode active materials that is increases, and has improved the compacted density of material, has guaranteed the energy density of positive electrode arrangement.
A kind of lithium ion cell positive, the preparation method of said positive pole is that active material B is coated on the surface of active material A earlier; To coat good active material and binding agent, conductive carbon then; Be mixed into slurry, then slurry be coated on the plus plate current-collecting body, the oven dry back forms anodal.The positive pole of this method preparation, dopant material B around the materials A, material B is protective material A effectively; Guarantee that positive pole possesses high energy density and security performance, this method equipment requirements is simple, easy to operate; Cost is low, enlarges in the production of reality that can be very fast and promotes.
A kind of lithium ion cell positive, the preparation method of said positive pole is earlier active material A, binding agent, conductive agent to be mixed into slurry; Then slurry is coated on the plus plate current-collecting body; As first starting sheet,, be mixed into slurry then with active material B, binding agent, conductive agent; Then slurry is coated on the surface of starting sheet just, the oven dry back forms anodal.The positive pole of this method preparation, active material A surface coverage layer of material B, outer field material B can effectively be protected active material A, the coating layer thickness of material B is controlled, equipment requirements is simple, and is easy to operate, cost is low.
A kind of lithium ion cell positive, the preparation method of said positive pole is that elder generation is mixed together active material A, active material B, binding agent, conductive carbon and stirs into slurry, then slurry is coated on the plus plate current-collecting body oven dry back formation positive pole.The positive electrode of this method preparation, this anode preparation method flow process is simple, needs process few, is easy to control anodal consistency.
Another object of the present invention is to provide a kind of lithium ion battery, and comprise positive pole, negative pole, be interval in the barrier film between the both positive and negative polarity, and electrolyte, described just very above-mentioned positive pole.
Other anode preparation methods of the present invention comprise but are not limited to above five kinds of modes.
Beneficial effect:
Among the present invention, contain A, two kinds of positive electrode active materials of B in the positive pole at least, wherein A has very high energy density, and B has the characteristic of high safety performance, and B and A collocation are used; Can be prepared into the anode material for lithium-ion batteries of a kind of high-energy-density and high security.
With respect to prior art, advantage of the present invention is, as anodal A and anodal B during with method for preparing, the A in the positive pole can utilize its high-energy-density, and B can utilize its high safety performance, and technology is simple, and cost is lower.
Advantage of the present invention is that also material B comprises the Ni of certain content, makes B possess certain energy density, after arranging in pairs or groups according to certain mode described in the present invention with A, has guaranteed the whole energy density of positive electrode.
Advantage of the present invention is that also material B comprises the Mn element with Ni element a great deal of simultaneously; The existence of Mn element makes Ni become+divalent by+3, and the valence state of Ni can not reach+4 valencys in charging process, has improved the structural stability and the thermal stability of material, after arranging in pairs or groups according to certain mode described in the present invention with A, improves the security performance of material.
Advantage of the present invention also is, contains elements such as a spot of Co or Mg in the material B; Having of these elements is beneficial to the electron conduction that improves material B; Help the diffusion of Li+ in anodal bulk material simultaneously; Especially the existence of Co element can significantly improve the high rate performance of material, thereby has guaranteed the whole chemical property of positive electrode.
The positive electrode B that this method makes can be coated on the surface of A phase mutually uniformly, stops A directly to contact with electrolyte, especially in the high voltage operation environment; The transition metal of A phase is easy to oxidation; Destructurized, oxygen release simultaneous oxidation electrolyte makes the battery gas phenomenon that rises.After A was coated by B mutually, the existence of the Mn element of B phase made and under high voltage, can keep stability of structure, stoped the generation of oxygen release, prevented the battery gas that rises.
Following table is the performance comparison of three kinds of both positive and negative polarity collocation, and as can be seen from the table, behind the positive pole that application A, B mix, the security performance of material obtains bigger raising than A, and energy density obtains bigger raising than B, and can guarantee the circulation and the memory property of battery.
The performance comparison of three kinds of both positive and negative polarity collocation
| Active material | Energy density | Cycle performance | Memory property | Drift bolt | Overcharge | Security performance |
| A+ graphite | +++++ | ++++ | ++++ | 4/5 | 3/5 | +++ |
| B+ graphite | +++ | ++++ | ++++ | 5/5 | 5/5 | +++++ |
| A+B+ graphite | ++++ | ++++ | ++++ | 5/5 | 5/5 | +++++ |
Annotate the good and bad grade of the above-mentioned battery performance of "+" expression, "+" bright its performance of speaking more more is good more.
Embodiment:
Below in conjunction with embodiment the present invention is further described.
Take into account security performance simultaneously for the energy density that improves lithium ion battery, contain A, two kinds of positive electrode active materials of B in the positive pole of lithium ion battery of the present invention at least, wherein A has the high characteristic of energy density, and B has the high characteristic of security performance; Adopt the negative active core-shell material of high gram volume in the negative pole of lithium ion battery of the present invention.Arrange in pairs or groups when using according to preparation method according to the invention when A active material and B active material, can access the positive electrode that possesses high-energy-density and high safety performance simultaneously.When this positive electrode and negative material collocation to high-energy-density according to the invention are used, can obtain energy density height, lithium ion battery that security performance is high.
Preferably; High energy density lithium ion battery among the present invention; Its barrier film can be polypropylene (PP) barrier film; Polyethylene (PE) barrier film, or PP and the compound macromolecule barrier film of PE also can be the polymer condensed state barrier films that polyvinylidene fluoride (PVDF), vinylidene difluoride-hexafluoropropylene copolymer (PVDF-HFP), polymethyl methacrylate (PMMA), polyethylene glycol (PEG) etc. form.
Preferably, the lithium ion battery that possesses high-energy-density and high safety performance simultaneously of the present invention, its electrolyte can be liquid electrolytes, also can be polymer dielectrics.
Preferably, the lithium ion battery that possesses high-energy-density and high safety performance simultaneously of the present invention, its collector can be the copper collectors, also can be the copper collector of surface through the porous of special processing.
Embodiment 1
A kind of high energy density lithium ion anode and use this anodal lithium ion battery, its concrete preparation process is following:
Anodal preparation: the first step: (select active material A precursor for use LiCoO
2Precursor Co
3O
4) and active material B (LiNi
0.5Mn
0.5O
2Precursor (Ni
0.5Mn
0.5) (OH)
2) the precursor ball mill mixing.Second step: in the mixture that mixes, add LiNO
3, make 0.95≤Li: (Ni+Mn+M)≤1.1, stir, under air atmosphere; In 780 ℃ of processing 20 hours, be prepared into the compound positive electrode of A and B, wherein, the mass ratio of A and B is 9: 1; In this example, A, B precursor are in sintering process, and two kinds of mutual embeddings of material form transition zone.The 3rd step: positive pole that will make and binding agent PVDF, conductive carbon powder SP are dissolved among the solvent NMP according to a certain percentage, stir to be slurry, then slurry are uniformly coated on the surface of collector, oven dry.In the 4th step,, make anode pole piece through colding pressing, cut into slices (size of promptly pole piece being reduced, cutting into required size).
The preparation of negative pole: with negative active core-shell material (select for use: native graphite) and binding agent (for example: (select for use: water), stirring is slurry, then slurry (for example: Copper Foil) is uniformly coated on negative current collector SBR) to be dissolved in solvent in proportion.Through colding pressing, cutting into slices, make cathode pole piece at last.
The assembling of battery: with anode pole piece, after barrier film and cathode pole piece were reeled, the formation model was 454261 battery, passes through encapsulation, fluid injection, changes into, and the moulding of bleeding makes the high energy density lithium ion battery.
The battery of preparing in this example, energy density are 520Wh/L.In safety test, the percent of pass of Nail (drift bolt) is 5/5, and the percent of pass of overcharge (overcharging) is 5/5.
Embodiment 2
A kind of high energy density lithium ion anode and use this anodal lithium ion battery, its concrete preparation process is following:
Anodal preparation: the first step: A (selects LiCoO for use with active material
2) (select LiNi for use with active material B
0.5Mn
0.5O
2) the particle ball mill mixing even.Under air atmosphere, in 750 ℃ of processing 20 hours, be prepared into the compound positive electrode of A and B, wherein, the mass ratio of A and B is 10: 1, in this example, A, two kinds of materials of B are embedding mutually in sintering process, forms transition zone.Second step: positive pole that will make and binding agent PVDF, conductive carbon powder SP are dissolved among the solvent NMP according to a certain percentage, stir to be slurry, then slurry are uniformly coated on the surface of collector, oven dry.In the 3rd step,, make anode pole piece through colding pressing, cut into slices (size of promptly pole piece being reduced, cutting into required size).
The preparation of negative pole: identical with embodiment 1, repeat no more here.
The assembling of battery: identical with embodiment 1, repeat no more here.
The battery of preparing in this example, energy density are 525Wh/L.In safety test, the percent of pass of Nail (drift bolt) is 5/5, and the percent of pass of overcharge (overcharging) is 5/5.
Embodiment 3
A kind of high energy density lithium ion anode and use this anodal lithium ion battery, its concrete preparation process is following:
Anodal preparation: the first step is LiNiCoO with active material A
2And binding agent (for example: butadiene-styrene rubber, i.e. SBR) (for example: water), stir, in slurry, (select active material B for use LiNi by the amount adding then is dissolved in solvent according to a certain percentage
0.45Mn
0.45Co
0.1O
2), solvent is fallen in final evaporation, and pulverizing, grinding is powder.Second step: the powder that the first step is made, binding agent are (for example: PVDF), (for example: (for example: NMP), stir is slurry to conductive agent, then slurry is uniformly coated on the surface of starting sheet just, oven dry SP) to be dissolved in solvent in proportion.In the 3rd step,, make anode pole piece through colding pressing, cut into slices (size of promptly pole piece being reduced, cutting into required size).Wherein, the mass ratio of A and B is 9: 1.
The preparation of negative pole: identical with embodiment 1, repeat no more here.
The assembling of battery: identical with embodiment 1, repeat no more here.
The battery of preparing in this example, energy density are 520Wh/L.In safety test, the percent of pass of drift bolt (Nail) is 5/5, and the percent of pass that overcharges (overcharge) is 5/5.
Embodiment 4
A kind of high energy density lithium ion battery, its concrete preparation process is following:
Anodal preparation: the first step, with active material A LiNiO
2, binding agent (for example: PVDF), (for example: (for example: NMP), stir is slurry to conductive agent, and (for example: aluminium foil), oven dry back is as first starting sheet then slurry to be uniformly coated on plus plate current-collecting body SP) to be dissolved in solvent in proportion; Second step is with active material B LiMnO
2And binding agent (for example: PVDF), (for example: (for example: NMP), stir is slurry to conductive agent, then slurry is uniformly coated on the surface of the first starting sheet that the first step makes, oven dry SP) to be dissolved in solvent in proportion.In the 3rd step,, make anode pole piece through colding pressing, cut into slices (size of promptly pole piece being reduced, cutting into required size).Wherein, the mass ratio of A and B is 8: 1.
The preparation of negative pole: identical with embodiment 1, repeat no more here.
The assembling of battery: identical with embodiment 1, repeat no more here.
The battery of preparing in this example, energy density are 530Wh/L.In safety test, the percent of pass of Nail (drift bolt) is 5/5, and the percent of pass of overcharge (overcharging) is 5/5.
Embodiment 5
A kind of high energy density lithium ion battery, its concrete preparation process is following:
Anodal preparation: the first step, with active material A LiCoO
2, active material B (selects for use: LiMn
2O
4), binding agent (for example: PVDF), conductive agent (for example: conductive carbon, i.e. SP) is dissolved in the solvent (for example: n-formyl sarcolysine base pyrrolidones, i.e. NMP) in proportion, stirring is slurry, then with slurry be uniformly coated on plus plate current-collecting body (for example: aluminium foil), oven dry; In second step,, make anode pole piece through colding pressing, cut into slices (size of promptly pole piece being reduced, cutting into required size).Wherein, the mass ratio of A and B is 7.5: 1.
The preparation of negative pole: identical with embodiment 1, repeat no more here.
The assembling of battery: identical with embodiment 1, repeat no more here.
The battery of preparing in this example, energy density are 530Wh/L.In safety test, the percent of pass of Nail (drift bolt) is 5/5, and the percent of pass of overcharge (overcharging) is 5/5.
Embodiment 6
Present embodiment is compared difference with embodiment 3 and is: active material B selects LiNi for use
0.5Mn
0.5O
2, the mass ratio of A and B is 7: 1.Other is identical with embodiment 3, repeats no more here.
The battery of preparing in this example, energy density are 524Wh/L.In safety test, the percent of pass of Nail is 5/5, and the percent of pass of overcharge is 5/5.
Embodiment 7
Present embodiment is compared difference with embodiment 3 and is: active material A selects LiNiCoO for use
2, B selects LiNi for use
0.4Mn
0.4Co
0.2O
2, the mass ratio of A and B is 5: 1.Negative active core-shell material is selected MCMB for use, and other embodiment 3 are identical, repeat no more here.
The battery of preparing in this example, energy density are 515Wh/L.In safety test, the percent of pass of Nail is 5/5, and the percent of pass of overcharge is 5/5.
Embodiment 8
Present embodiment is compared difference with embodiment 3 and is: active material selects for use A to select LiNi for use
0.8Co
0.15Mg
0.05O
2, B selects LiNi for use
0.45Mn
0.45Co
0.1O
2, select A for use: the B weight ratio is 5: 1.Other is identical with embodiment 3, repeats no more here.
The battery of preparing in this example, energy density are 535Wh/L.In safety test, the percent of pass of Nail is 5/5, and the percent of pass of overcharge is 5/5.
Embodiment 9
Present embodiment is compared difference with embodiment 3 and is: positive electrode active materials B is LiNi
1/3Co
1/3M
1/3O
2, wherein M is Al, selects A for use: the B weight ratio is 6: 1.Other is identical with embodiment 3, repeats no more here.
The battery of preparing in this example, energy density are 517Wh/L.In safety test, the percent of pass of Nail is 5/5, and the percent of pass of overcharge is 5/5.
Embodiment 10
Present embodiment is compared difference with embodiment 3 and is: positive electrode active materials B adopts LiNi
1/3Mn
1/3Co
(1/3-z)Al
z] O
2(z=0.1), select A for use: the B weight ratio is 9: 1.Other is identical with embodiment 3, repeats no more here.
The battery of preparing in this example, energy density are 540Wh/L.In safety test, the percent of pass of Nail is 5/5, and the percent of pass of overcharge is 5/5.
Embodiment 11
Present embodiment is compared difference with embodiment 3 and is: positive electrode active materials B adopts Li [Ni
(1/3-x)Mn
(1/3-x)Co
(1/3x)M
x] O2 (M=Fe, Mg, x=0.1).Other is identical with embodiment 3, repeats no more here.
The battery of preparing in this example, energy density are 524Wh/L.In safety test, the percent of pass of Nail is 5/5, and the percent of pass of overcharge is 5/5.
Need to prove that according to the announcement and the elaboration of above-mentioned specification, those skilled in the art in the invention can also change and revise above-mentioned execution mode.Therefore, the embodiment that discloses and describe above the present invention is not limited to also should be in the protection range of claim of the present invention to equivalent modifications more of the present invention and change.In addition, although used some specific terms in this specification, these terms are explanation for ease just, the present invention is not constituted any restriction.
Claims (10)
1. a lithium ion cell positive comprises collector, and attached to the active material on the collector, it is characterized in that: described active material contains active material A and active material B;
Described active material A has the Li of high-energy-density
1+xCoO
2, Li
1+xNiO
2, Li
1+xNi
0.8Co
0.15M
0.05O
2(M=Al, Mg, Cr, Mn), Li
1+xCo
1-yNi
yO
2In (wherein :-0.3≤x≤0.3,0＜y≤0.3) one or several;
Said active material B has the Li of high safety performance
zMn
2O
4, Li
zMnO
2, Li
zMn
1-xNi
xO
2, Li
zNi
xMn
yM
1-x-yO
2, wherein M is any one or several kinds among Co, A1, Mg, Cr, Ti, Zr, Pt, Au, Pd, Ce, Pr, the Nd, x ≈ y≤0.5 wherein, x+y≤1,0.95≤z≤1.10;
Wherein, the mass ratio of said active material A and active material B is 1～19.
2. a kind of lithium ion cell positive according to claim 1 is characterized in that: said active material B is Li
zNi
xMn
yM
1-x-yO
2, wherein M is any one perhaps several kinds among Co, Al, Mg, Cr, Ti, Zr, Pt, Au, Pd, Ce, Pr, the Nd, wherein 0.3≤x ≈ y≤0.45,0.95≤z≤1.05.
3. a kind of lithium ion cell positive according to claim 1; It is characterized in that: active material comprises graphite, hard carbon, CNT in the said negative pole; Graphene etc., metal nitride, Sn base alloy, Si base alloy, Sn-C compound, Si-C compound, SnO/SnO
2, SiO
x, SbO
xIn any one or several kinds, 0.5＜x＜2 wherein.
4. a kind of lithium ion cell positive according to claim 1 is characterized in that: described charging voltage platform is at 4.20～4.60V.
5. a kind of lithium ion cell positive according to claim 1; It is characterized in that: the preparation method of said positive pole does; Precursor with active material A evenly mixes with the precursor ball milling of active material B earlier; Wherein, active material B is the granule precursor of 0.5～10um and the precursor that behind ball milling, can evenly be coated on active material A surface, with adding lithium salts in the gained mixture; Lithium salts comprises: Li
2CO
3, LiOH, LiNO
3In one or more; The ratio of lithium salts is: 0.95≤Li: (Ni+Mn+M)≤1.1, stir, at high temperature carry out sintering then; With the active material of gained and binding agent, conductive carbon; Be mixed into slurry, then slurry be coated on the plus plate current-collecting body, the oven dry back forms anodal.
6. described a kind of lithium ion cell positive according to claim 1; It is characterized in that: the preparation method of said positive pole does; Active material A is evenly mixed with active material B ball milling; Wherein, active material B is the granule of 0.5～10um and the surface that behind ball milling, can evenly be coated on active material A; At high temperature carry out sintering then, with the active material of gained and binding agent, conductive carbon, be mixed into slurry then, then slurry is coated on the plus plate current-collecting body, the oven dry back forms anodal.
7. described a kind of lithium ion cell positive according to claim 1; It is characterized in that: the preparation method of said positive pole does; Active material B is coated on the surface of active material A earlier, will coat good active material and binding agent, conductive carbon then, is mixed into slurry; Then slurry is coated on the plus plate current-collecting body, the oven dry back forms anodal.
8. described a kind of lithium ion cell positive according to claim 1 is characterized in that: it is characterized in that: the preparation method of said positive pole is earlier active material A, binding agent, conductive agent to be mixed into slurry; Then slurry is coated on the plus plate current-collecting body; As first starting sheet,, be mixed into slurry then with active material B, binding agent, conductive agent; Then slurry is coated on the surface of starting sheet just, the oven dry back forms anodal.
9. described a kind of lithium ion cell positive according to claim 1; It is characterized in that: the preparation method of said positive pole does; Earlier active material A, active material B, binding agent, conductive carbon are mixed together and stir into slurry; Then slurry is coated on the plus plate current-collecting body, the oven dry back forms anodal.
10. a lithium ion battery comprises positive pole, negative pole, is interval in the barrier film between the both positive and negative polarity, and electrolyte, it is characterized in that: the described positive pole of described just very claim 1-9.
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| CN2011102854648A CN102339981A (en) | 2011-09-23 | 2011-09-23 | Lithium ion battery and anode thereof |
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ID=45515575
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