CN111883829A - Non-aqueous electrolyte of lithium ion battery and lithium ion battery - Google Patents
Non-aqueous electrolyte of lithium ion battery and lithium ion battery Download PDFInfo
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/05—Accumulators with non-aqueous electrolyte
- H01M10/056—Accumulators with non-aqueous electrolyte characterised by the materials used as electrolytes, e.g. mixed inorganic/organic electrolytes
- H01M10/0564—Accumulators with non-aqueous electrolyte characterised by the materials used as electrolytes, e.g. mixed inorganic/organic electrolytes the electrolyte being constituted of organic materials only
- H01M10/0566—Liquid materials
- H01M10/0567—Liquid materials characterised by the additives
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- 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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- H—ELECTRICITY
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- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M2300/00—Electrolytes
- H01M2300/0017—Non-aqueous electrolytes
- H01M2300/0025—Organic electrolyte
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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Abstract
The invention provides a lithium ion battery non-aqueous electrolyte and a lithium ion battery, wherein the lithium ion battery non-aqueous electrolyte comprises a compound additive with a structure shown in a formula I, the additive can enable the capacity retention rate of the lithium ion battery to be more than 73% after 200 times of 45-DEG C circulation, the capacity retention rate to be more than 71%, the capacity recovery rate to be more than 72% and the thickness expansion rate to be less than 31% after the lithium ion battery is stored for 30 days at a high temperature of 60 ℃, and the problems of too fast capacity fading and severe high-temperature ballooning of the current lithium ion battery non-aqueous electrolyte in circulation are solved.
Description
Technical Field
The invention belongs to the field of lithium ion batteries, and relates to a lithium ion battery non-aqueous electrolyte and a lithium ion battery.
Background
With the development of new energy vehicles, power energy storage and high-performance digital products, people have higher and higher requirements on the performance and the application range of batteries, and therefore lithium ion batteries which can meet the increasing demands need to be developed. This is particularly important to improve the cycle life and temperature suitability of the battery.
Disclosure of Invention
In view of the defects of the prior art, the invention aims to provide a lithium ion battery nonaqueous electrolyte and a lithium ion battery. The lithium ion battery non-aqueous electrolyte can solve the problems of too fast capacity fading of the cycle of the conventional lithium ion battery non-aqueous electrolyte and severe high-temperature ballooning.
In order to achieve the purpose, the invention adopts the following technical scheme:
in one aspect, the invention provides a lithium ion battery nonaqueous electrolyte, which includes a compound additive with a structure shown in formula I below:
wherein R is1One selected from unsubstituted C1-C4 hydrocarbyl, C1-C4 fluorinated hydrocarbyl, C1-C4 silicon-containing hydrocarbyl, and cyano-substituted C1-C4 hydrocarbyl. R2One selected from hydrogen atom, fluorine atom, unsubstituted C1-C4 hydrocarbyl, C1-C4 fluorinated hydrocarbyl, C1-C4 oxygen-containing hydrocarbyl, C1-C4 silicon-containing hydrocarbyl, and cyano-substituted C1-C4 hydrocarbyl.
In the present invention, a definition of a carbon atom in the group, for example, C1-C4, means that the number of carbon atoms in the defined group may be 1, 2, 3 or 4.
In the invention, the special additive is used, and the existence of the phosphazene structure in the structure can improve the high-temperature stability of the electrolyte, thereby inhibiting the decomposition of the electrolyte under the high-temperature condition to a certain extent, and effectively improving the cycle performance and the high-temperature storage performance of the lithium ion battery.
Preferably, the compound additive is selected from any one of or a combination of at least two of the compounds represented by the following structures:
the synthetic route of the compound additive shown in the formula I is as follows:
taking compound 1 as an example, the specific embodiment is as follows:
hydroxy-methane diacid and dichloro-methyl phosphate with the molar ratio of 1:1 are subjected to synthetic reaction in solvent triethylamine at the temperature of 0-70 ℃ by using catalyst TBU or TBD to obtain the compound 1.
Preferably, the compound additive represented by the formula I is contained in an amount of 0.1 to 5% by mass, for example, 0.5%, 0.8%, 1%, 1.5%, 1.8%, 2%, 2.5%, 2.8%, 3%, 3.5%, 3.8%, 4%, 4.5% or 5%, preferably 1 to 3% by mass, based on 100% by mass of the total mass of the lithium ion battery nonaqueous electrolyte solution.
Preferably, the solvent in the non-aqueous electrolyte of the lithium ion battery is selected from any one of Ethylene Carbonate (EC), Propylene Carbonate (PC), Butylene Carbonate (BC), dimethyl carbonate (DMC), diethyl carbonate (DEC), Ethyl Methyl Carbonate (EMC) or Methyl Propyl Carbonate (MPC) or a combination of at least two thereof.
Preferably, the lithium ion battery non-aqueous electrolyte further comprises other additives besides the compound additive shown in the formula I.
Preferably, the other additive includes at least one of an unsaturated cyclic carbonate-based compound or a sultone-based compound.
Preferably, the unsaturated cyclic carbonate-based compound includes at least one of vinylene carbonate (abbreviated as VC) and vinyl ethylene carbonate (abbreviated as VEC).
Preferably, the sultone compound comprises at least one of 1, 3-Propane Sultone (PS) and 1, 4-butane sultone.
Preferably, the unsaturated cyclic carbonate compound is contained in an amount of 0.1 to 5% by mass, for example, 0.5%, 0.8%, 1%, 1.5%, 1.8%, 2%, 2.5%, 2.8%, 3%, 3.5%, 3.8%, 4%, 4.5% or 5% by mass based on 100% by mass of the total amount of the lithium ion battery nonaqueous electrolyte solution.
Preferably, the content of the sultone-based compound is 0.1 to 5% by mass, for example, 0.5%, 0.8%, 1%, 1.5%, 1.8%, 2%, 2.5%, 2.8%, 3%, 3.5%, 3.8%, 4%, 4.5% or 5% by mass based on 100% by mass of the total mass of the nonaqueous electrolyte solution for a lithium ion battery.
Preferably, the other additives further include lithium salt additives, and the lithium salt additives include LiBOB (bis (oxalato) borate), LiFSi (lithium difluorosulfonato imide), LiODFB (lithium difluorooxalato borate), and LiBF4(lithium tetrafluoroborate) LiPO2F2(lithium difluorophosphate) or LiDFOP (lithium difluorobis (oxalato) phosphate), or a combination of at least two of them.
Preferably, the lithium salt-based additive is contained in an amount of 0.1 to 5% by mass, for example, 0.5%, 0.8%, 1%, 1.5%, 1.8%, 2%, 2.5%, 2.8%, 3%, 3.5%, 3.8%, 4%, 4.5% or 5% by mass based on 100% by mass of the total amount of the lithium ion battery nonaqueous electrolyte solution.
Preferably, the electrolyte in the non-aqueous electrolyte of the lithium ion battery is a lithium salt, and the lithium salt is preferably LiPF6。
Preferably, the content of the electrolyte lithium salt in the non-aqueous electrolyte solution of the lithium ion battery is 0.1 to 20% by mass, for example, 0.5%, 0.8%, 1%, 1.5%, 2%, 3%, 4%, 5%, 6%, 7%, 8%, 9%, 10%, 12%, 14%, 16%, 18% or 20%.
In another aspect, the present invention provides a lithium ion battery comprising a positive electrode, a negative electrode, a separator disposed between the positive electrode and the negative electrode, and an electrolyte solution, wherein the electrolyte solution is the lithium ion battery non-aqueous electrolyte solution described above.
Preferably, the positive electrode includes an active material that is LiNixCoyMnzL(1-x-y-z)O2、LiCoxL(1-x')O2、LiNixLyMn(2-x”-y')O4Liz'MPO4At least one of; wherein L is at least one of Co, Al, Sr, Mg, Ti, Ca, Zr, Zn, Si and Fe; x is more than or equal to 0 and less than or equal to 1, y is more than or equal to 0 and less than or equal to 1, z is more than or equal to 0 and less than or equal to 1,x + y + z is more than 0 and less than or equal to 1, x ' is more than 0 and less than or equal to 1, x is more than 0.3 and less than or equal to 0.6, y ' is more than 0.01 and less than or equal to 0.2, z ' is more than or equal to 0.5 and less than or equal to 1, and M is at least one of Fe, Mn and Co.
In the present invention, the positive electrode, the negative electrode, and the separator are not particularly limited, and any of the positive electrode, the negative electrode, and the separator that are conventional in the art can be used.
The lithium ion battery non-aqueous electrolyte provided by the invention effectively improves the cycle and high-temperature storage performance of the battery, and the lithium ion battery containing the non-aqueous electrolyte has excellent cycle performance and high-temperature storage performance.
Compared with the prior art, the invention has the following beneficial effects:
the compound additive shown in the formula I is used in the non-aqueous electrolyte of the lithium ion battery, so that the special additive can be used, and the existence of the phosphazene structure in the structure can improve the high-temperature stability of the electrolyte, thereby inhibiting the decomposition of the electrolyte under the high-temperature condition to a certain extent and effectively improving the cycle performance and the high-temperature storage performance of the lithium ion battery. The capacity retention rate of the lithium ion battery can be more than 73% after 200 times of 45 ℃ circulation, the capacity retention rate is more than 71%, the capacity recovery rate is more than 72%, the thick expansion rate is less than 31% after the lithium ion battery is stored for 30 days at a high temperature of 60 ℃, and the lithium ion battery has a wide market application prospect.
Detailed Description
The technical solution of the present invention is further explained by the following embodiments. It should be understood by those skilled in the art that the examples are only for the understanding of the present invention and should not be construed as the specific limitations of the present invention.
Example 1
LiNi0.5Co0.2Mn0.3O2An artificial graphite battery comprises a positive electrode (NCM523 from Union, Confucius), a negative electrode (artificial graphite P15 from fir), a diaphragm (PP/PE from Hakko), and an electrolyte, wherein the electrolyte is a nonaqueous electrolyte, the total weight of the nonaqueous electrolyte is 100%, and the nonaqueous electrolyte contains the components with the mass percentages shown in example 1 in Table 1 and 12% of LiPF6And (3) salt.
Example 2
LiNi0.5Co0.2Mn0.3O2An artificial graphite battery comprises a positive electrode (NCM523 from Union, Confucius), a negative electrode (artificial graphite P15 from fir), a separator (PP/PE from Hakko), and an electrolyte, wherein the electrolyte is a nonaqueous electrolyte, the total weight of the nonaqueous electrolyte is 100%, and the nonaqueous electrolyte contains the components with the mass percentages shown in example 2 in Table 1 and 12% of LiPF6And (3) salt.
Example 3
LiNi0.5Co0.2Mn0.3O2An artificial graphite battery comprises a positive electrode (NCM523 from Union, Confucius), a negative electrode (artificial graphite P15 from fir), a diaphragm (PP/PE from Hakko), and an electrolyte, wherein the electrolyte is a nonaqueous electrolyte, the total weight of the nonaqueous electrolyte is 100%, and the nonaqueous electrolyte contains the components with the mass percentage shown in example 3 in Table 1 and 12% of LiPF6And (3) salt.
Example 4
LiNi0.5Co0.2Mn0.3O2An artificial graphite battery comprises a positive electrode (NCM523 from Union, Confucius), a negative electrode (artificial graphite P15 from fir), a separator (PP/PE from Hakko), and an electrolyte, wherein the electrolyte is a nonaqueous electrolyte, the total weight of the nonaqueous electrolyte is 100%, and the nonaqueous electrolyte contains the components with the mass percentage shown in example 4 in Table 1 and 12% of LiPF6And (3) salt.
Example 5
LiNi0.5Co0.2Mn0.3O2An artificial graphite battery comprises a positive electrode (NCM523 from Union, Confucius), a negative electrode (artificial graphite P15 from fir), a separator (PP/PE from Hakko), and an electrolyte, wherein the electrolyte is a nonaqueous electrolyte, the total weight of the nonaqueous electrolyte is 100%, and the nonaqueous electrolyte contains the components with the mass percentage shown in example 5 in Table 1 and 12% of LiPF6And (3) salt.
Example 6
LiNi0.5Co0.2Mn0.3O2An artificial graphite battery comprises a positive electrode (NCM523 from Union, Congress) and a negative electrode (artificial graphite)Graphite P15 from fir, a separator (PP/PE from hazel), and an electrolyte, wherein the electrolyte is a nonaqueous electrolyte, and the total weight of the nonaqueous electrolyte is 100%, and the electrolyte contains the components shown in example 6 in Table 1 in percentage by mass and 12% of LiPF6And (3) salt.
Example 7
LiNi0.5Co0.2Mn0.3O2An artificial graphite battery comprises a positive electrode (NCM523 from Union, Confucius), a negative electrode (artificial graphite P15 from fir), a separator (PP/PE from Hakko), and an electrolyte, wherein the electrolyte is a nonaqueous electrolyte, the total weight of the nonaqueous electrolyte is 100%, and the nonaqueous electrolyte contains the components with the mass percentages shown in example 7 in Table 1 and 12% of LiPF6And (3) salt.
Example 8
LiNi0.5Co0.2Mn0.3O2An artificial graphite battery comprises a positive electrode (NCM523 from Union, Confucius), a negative electrode (artificial graphite P15 from fir), a separator (PP/PE from Hakko), and an electrolyte, wherein the electrolyte is a nonaqueous electrolyte, the total weight of the nonaqueous electrolyte is 100%, and the nonaqueous electrolyte contains the components with the mass percentage shown in example 8 in Table 1 and 12% of LiPF6And (3) salt.
Example 9
LiNi0.5Co0.2Mn0.3O2An artificial graphite battery comprises a positive electrode (NCM523 from Union, Confucius), a negative electrode (artificial graphite P15 from fir), a separator (PP/PE from Hakko), and an electrolyte, wherein the electrolyte is a nonaqueous electrolyte, the total weight of the nonaqueous electrolyte is 100%, and the nonaqueous electrolyte contains the components with the mass percentages shown in example 9 in Table 1 and 12% of LiPF6And (3) salt.
Example 10
LiNi0.5Co0.2Mn0.3O2An artificial graphite battery comprises a positive electrode (NCM523 from Union, Confucius), a negative electrode (artificial graphite P15 from Taxus), a separator (PP/PE from Haw), and an electrolyte, wherein the electrolyte is a nonaqueous electrolyte, the total weight of the nonaqueous electrolyte is 100%, and the nonaqueous electrolyte containsHaving the components in the mass percentages shown in example 10 of Table 1 and 12% LiPF6And (3) salt.
Example 11
LiNi0.5Co0.2Mn0.3O2An artificial graphite battery comprises a positive electrode (NCM523 from Union, Confucius), a negative electrode (artificial graphite P15 from fir), a separator (PP/PE from Hakko), and an electrolyte, wherein the electrolyte is a nonaqueous electrolyte, the total weight of the nonaqueous electrolyte is 100%, and the nonaqueous electrolyte contains the components with the mass percentages shown in example 11 of Table 1 and 12% of LiPF6And (3) salt.
Example 12
LiNi0.5Co0.2Mn0.3O2An artificial graphite battery comprises a positive electrode (NCM523 from Union, Confucius), a negative electrode (artificial graphite P15 from fir), a separator (PP/PE from Hakko), and an electrolyte, wherein the electrolyte is a nonaqueous electrolyte, the total weight of the nonaqueous electrolyte is 100%, and the nonaqueous electrolyte contains the components with the mass percentage shown in example 12 in Table 1 and 12% of LiPF6And (3) salt.
Example 13
LiNi0.5Co0.2Mn0.3O2An artificial graphite battery comprises a positive electrode (NCM523 from Union, Confucius), a negative electrode (artificial graphite P15 from fir), a separator (PP/PE from Hakko), and an electrolyte, wherein the electrolyte is a nonaqueous electrolyte, the total weight of the nonaqueous electrolyte is 100%, and the nonaqueous electrolyte contains the components with the mass percentage shown in example 13 in Table 1 and 12% of LiPF6And (3) salt.
Example 14
LiNi0.5Co0.2Mn0.3O2An artificial graphite battery comprises a positive electrode (NCM523 from Union, Confucius), a negative electrode (artificial graphite P15 from fir), a separator (PP/PE from Hakko), and an electrolyte, wherein the electrolyte is a nonaqueous electrolyte, the total weight of the nonaqueous electrolyte is 100%, and the nonaqueous electrolyte contains the components with the mass percentage shown in example 14 of Table 1 and 12% of LiPF6And (3) salt.
Comparative example 1
LiNi0.5Co0.2Mn0.3O2An artificial graphite battery comprising a positive electrode (NCM523 from Union, Confucius), a negative electrode (artificial graphite P15 from Taxus), a separator (PP/PE from Hakko), and an electrolyte, wherein the electrolyte is a nonaqueous electrolyte, and the total weight of the nonaqueous electrolyte is 100%, and the battery comprises the components in the mass percentages shown in comparative example 1 in Table 1 and 12% of LiPF6And (3) salt.
Comparative example 2
LiNi0.5Co0.2Mn0.3O2An artificial graphite battery comprising a positive electrode (NCM523 from Union, Confucius), a negative electrode (artificial graphite P15 from Taxus), a separator (PP/PE from Hakko), and an electrolyte, wherein the electrolyte is a nonaqueous electrolyte, and the total weight of the nonaqueous electrolyte is 100%, and the battery comprises the components in the mass percentages shown in comparative example 2 in Table 1 and 12% of LiPF6And (3) salt.
Comparative example 3
LiNi0.5Co0.2Mn0.3O2An artificial graphite battery comprising a positive electrode (NCM523 from Union, Confucius), a negative electrode (artificial graphite P15 from Taxus), a separator (PP/PE from Hakko), and an electrolyte, wherein the electrolyte is a nonaqueous electrolyte, and the total weight of the nonaqueous electrolyte is 100%, and the battery comprises the components in the mass percentages shown in comparative example 3 in Table 1 and 12% of LiPF6And (3) salt.
Comparative example 4
LiNi0.5Co0.2Mn0.3O2An artificial graphite battery comprising a positive electrode (NCM523 from Union, Confucius), a negative electrode (artificial graphite P15 from Taxus), a separator (PP/PE from Hakko), and an electrolyte, wherein the electrolyte is a nonaqueous electrolyte, and the total weight of the nonaqueous electrolyte is 100%, and the battery comprises the components in the mass percentages shown in comparative example 4 in Table 1 and 12% of LiPF6And (3) salt.
The performance tests of the examples 1-14 and the comparative examples 1-4 of the invention are carried out, and the test indexes and the test methods are as follows:
(1) high temperature cycle performance, capacity retention rate N times at 45 ℃ and 1C cycleThe concrete method comprises the following steps: the battery after formation was charged to 4.35V (LiNi) at 45 ℃ with a 1C constant current and constant voltage0.5Co0.2Mn0.3O2Artificial graphite), the off current was 0.02C, and then the discharge was made to 3.0V with a constant current of 1C. After such charge/discharge cycles, the capacity retention rate after 200 weeks' cycles was calculated to evaluate the high-temperature cycle performance thereof.
The calculation formula of the capacity retention rate after 200 cycles at 45 ℃ is as follows:
the 200 th cycle capacity retention (%) was (200 th cycle discharge capacity/1 st cycle discharge capacity) × 100%
(2) Method for testing capacity retention rate, capacity recovery rate and thickness expansion rate after 30 days of storage at 60 ℃: charging the formed battery to 4.4V (LiNi) at normal temperature by using a 1C constant current and constant voltage0.5Co0.2Mn0.3O2Artificial graphite), the cutoff current was 0.02C, then 1C constant current discharge to 3.0V, the initial discharge capacity of the battery was measured, then 1C constant current constant voltage charge to 4.4V, the cutoff current was 0.01C, the initial thickness of the battery was measured, then the thickness of the battery was measured after storing the battery at 60 ℃ for 30 days, then 1C constant current discharge to 3.0V, the retention capacity of the battery was measured, then 1C constant current constant voltage charge to 3.0V, the cutoff battery was 0.02C, then 1C constant current discharge to 3.0V, the recovery capacity was measured. The calculation formulas of the capacity retention rate, the capacity recovery rate and the thickness expansion are as follows:
battery capacity retention (%) retention capacity/initial capacity × 100%
Battery capacity recovery (%) -recovery capacity/initial capacity X100%
Battery thickness swelling ratio (%) (thickness after 30 days-initial thickness)/initial thickness × 100%
TABLE 1
The test results of experimental examples 1 to 14 and comparative examples 1 to 4 are shown in table 2 below.
TABLE 2
The results in table 2 show that the addition of the additive for nonaqueous lithium ion battery electrolyte according to the present invention can make the capacity retention rate of the lithium ion battery 73% or more after 200 cycles at 45 ℃, and the capacity retention rate of the lithium ion battery after 30 days of high temperature storage at 60 ℃ is 71% or more, the capacity recovery rate is 72% or more, and the thick expansion rate is 31% or less. The comparative example, in which such an additive was not added, resulted in a significant decrease in high-temperature capacity retention rate, capacity recovery rate, and cycle performance, and a significant increase in thick expansion rate.
The applicant states that the present invention is described by the above examples of the lithium ion battery nonaqueous electrolyte solution of the present invention and the lithium ion battery comprising the same, but the present invention is not limited to the above examples, that is, the present invention is not meant to be implemented only by relying on the above examples. It should be understood by those skilled in the art that any modification of the present invention, equivalent substitutions of the raw materials of the product of the present invention, addition of auxiliary components, selection of specific modes, etc., are within the scope and disclosure of the present invention.
Claims (10)
1. The non-aqueous electrolyte of the lithium ion battery is characterized by comprising a compound additive with the structure shown as the following formula I:
wherein R is1One selected from unsubstituted C1-C4 hydrocarbyl, C1-C4 fluorinated hydrocarbyl, C1-C4 silicon-containing hydrocarbyl, and cyano-substituted C1-C4 hydrocarbyl. R2One selected from hydrogen atom, fluorine atom, unsubstituted C1-C4 hydrocarbyl, C1-C4 fluorinated hydrocarbyl, C1-C4 oxygen-containing hydrocarbyl, C1-C4 silicon-containing hydrocarbyl, and cyano-substituted C1-C4 hydrocarbyl.
2. The nonaqueous electrolyte solution for lithium ion batteries according to claim 1, wherein the compound additive is selected from any one of compounds represented by the following structures or a combination of at least two of the compounds:
3. the nonaqueous electrolyte solution for lithium ion batteries according to claim 1 or 2, wherein the compound additive represented by the formula I is contained in an amount of 0.1 to 5% by mass, preferably 1 to 3% by mass, based on 100% by mass of the total mass of the nonaqueous electrolyte solution for lithium ion batteries.
4. The nonaqueous electrolyte solution for a lithium ion battery according to any one of claims 1 to 3, wherein a solvent in the nonaqueous electrolyte solution for a lithium ion battery is selected from any one of ethylene carbonate, propylene carbonate, butylene carbonate, dimethyl carbonate, diethyl carbonate, ethylmethyl carbonate, and methylpropyl carbonate, or a combination of at least two thereof.
5. The lithium-ion battery nonaqueous electrolyte solution according to any one of claims 1 to 4, characterized in that the lithium-ion battery nonaqueous electrolyte solution further comprises other additives besides the compound additive represented by formula I;
preferably, the other additive comprises at least one of unsaturated cyclic carbonate ester compounds or sultone compounds;
preferably, the unsaturated cyclic carbonate compound comprises at least one of vinylene carbonate and ethylene carbonate;
preferably, the sultone compound comprises at least one of 1, 3-propane sultone and 1, 4-butane sultone;
preferably, the content of the unsaturated cyclic carbonate compound is 0.1-5% by taking the total mass of the lithium ion battery nonaqueous electrolyte as 100%;
preferably, the content of the sultone compounds in percentage by mass is 0.1-5% based on 100% of the total mass of the lithium ion battery nonaqueous electrolyte.
6. The nonaqueous electrolyte solution for lithium ion batteries according to any one of claims 1 to 5, wherein the other additives further comprise lithium salt additives, and the lithium salt additives comprise LiBOB, LiFSI, LiODFB, LiBF4、LiPO2F2Or a combination of at least two of the foregoing.
7. The nonaqueous electrolyte solution for lithium ion batteries according to any one of claims 1 to 6, wherein the lithium salt-based additive is contained in an amount of 0.1 to 5% by mass based on 100% by mass of the total mass of the nonaqueous electrolyte solution for lithium ion batteries.
8. The nonaqueous electrolyte solution for lithium ion batteries according to any one of claims 1 to 7, wherein the electrolyte in the nonaqueous electrolyte solution for lithium ion batteries is a lithium salt, and the lithium salt is preferably LiPF6；
Preferably, the mass percentage of the electrolyte lithium salt in the lithium ion battery non-aqueous electrolyte is 0.1-20%.
9. A lithium ion battery comprising a positive electrode, a negative electrode, a separator provided between the positive electrode and the negative electrode, and an electrolytic solution, wherein the electrolytic solution is the lithium ion battery nonaqueous electrolytic solution according to any one of claims 1 to 8.
10. The lithium ion battery of claim 9, wherein the positive electrode comprises an active material that is LiNixCoyMnzL(1-x-y-z)O2、LiCoxL(1-x')O2、LiNixLyMn(2-x”-y')O4Liz'MPO4At least one of; wherein L is at least one of Co, Al, Sr, Mg, Ti, Ca, Zr, Zn, Si and Fe; x is more than or equal to 0 and less than or equal to 1, y is more than or equal to 0 and less than or equal to 1, z is more than or equal to 0 and less than or equal to 1, x + y + z is more than 0 and less than or equal to 1, x ' is more than 0.3 and less than or equal to 0.6, y ' is more than 0.01 and less than or equal to 0.2, z ' is more than or equal to 0.5 and less than or equal to 1, and M is at least one of Fe, Mn and Co.
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