CN115275342A - Lithium ion battery electrolyte and lithium ion battery - Google Patents

Lithium ion battery electrolyte and lithium ion battery Download PDF

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Publication number
CN115275342A
CN115275342A CN202210808269.7A CN202210808269A CN115275342A CN 115275342 A CN115275342 A CN 115275342A CN 202210808269 A CN202210808269 A CN 202210808269A CN 115275342 A CN115275342 A CN 115275342A
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electrolyte
additive
lithium
ion battery
lithium ion
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段凯嘉
张昌明
李枫
邓卫龙
胡大林
廖兴群
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Huizhou Highpower Technology Co Ltd
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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
    • 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
    • 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
    • H01M10/42—Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells
    • H01M10/4235—Safety or regulating additives or arrangements in electrodes, separators or electrolyte
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M2300/00—Electrolytes
    • H01M2300/0088—Composites
    • H01M2300/0091—Composites in the form of mixtures
    • 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
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02E60/10—Energy storage using batteries

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  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
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  • Electrochemistry (AREA)
  • General Chemical & Material Sciences (AREA)
  • Physics & Mathematics (AREA)
  • Condensed Matter Physics & Semiconductors (AREA)
  • General Physics & Mathematics (AREA)
  • Inorganic Chemistry (AREA)
  • Materials Engineering (AREA)
  • Secondary Cells (AREA)

Abstract

The invention discloses a lithium ion battery electrolyte and a lithium ion battery, which comprise lithium salt, a solvent and an additive, wherein the additive comprises an additive A, an additive B, a film forming additive and a lithium salt additive; the general formula of the additive A is shown as the following formula I, and the general formula of the additive B is shown as the following formula II:
Figure DDA0003737988400000011
wherein R is1Selected from alkyl groups of 1 to 3 carbon atoms partially or fully substituted by nitrile groups, R2、R3、R4、R5Any one selected from fluorine atoms, hydrogen atoms and nitrile groups; x1, X2 and X3 are selected from any one of alkyl, halogenated alkyl, alkenyl, alkynyl, aromatic and halogenated aromatic.

Description

Lithium ion battery electrolyte and lithium ion battery
Technical Field
The invention relates to the technical field of secondary batteries, in particular to a lithium ion battery electrolyte and a lithium ion battery.
Background
The lithium ion battery has the advantages of high specific energy, no memory effect, environmental protection and the like, and is widely applied to consumer electronic products and power batteries at present. With the expansion of the market scale of the lithium ion battery, higher demands are also put on the comprehensive performance of the lithium ion battery. The high-temperature cycle life and the high-temperature storage performance of the battery become important indexes for measuring the comprehensive performance of the lithium ion battery.
The performance of the lithium ion battery is a key factor related to the popularity of the lithium ion battery in the market. The performance of the lithium ion battery is comprehensively influenced by various indexes, wherein the lithium salt and the additive ratio of the electrolyte are two particularly key indexes by optimizing the electrolyte formula and simultaneously regulating and controlling the characteristics of the anode and cathode materials. The high-temperature cycle life and the high-temperature storage performance of the lithium ion battery can be remarkably improved. The conventional lithium ion battery is difficult to bear high-temperature circulation and high-temperature storage.
Disclosure of Invention
The invention aims to provide a lithium ion battery electrolyte and a lithium ion battery, and the lithium ion battery electrolyte and the lithium ion battery improve the high-temperature storage and cycle performance of the lithium ion battery.
The invention discloses a lithium ion battery electrolyte, which comprises lithium salt, a solvent and an additive, wherein the additive comprises an additive A, an additive B, a film forming additive and a lithium salt additive; the general formula of the additive A is shown as the following formula I, and the general formula of the additive B is shown as the following formula II:
Figure BDA0003737988390000021
wherein R is1Selected from alkyl groups of 1 to 3 carbon atoms partially or fully substituted by nitrile groups, R2、R3、R4、R5Any one selected from fluorine atoms, hydrogen atoms and nitrile groups; x1, X2 and X3 are selected from any one of alkyl, halogenated alkyl, alkenyl, alkynyl, aromatic and halogenated aromatic.
Optionally, the content of the additive A accounts for 0.1-3 wt% of the total mass of the electrolyte; and/or the content of the additive B accounts for 0.1 to 3 weight percent of the total mass of the electrolyte.
Optionally, the film forming additive is selected from two or more of fluoroethylene carbonate, vinylene carbonate, 1, 3-propane sultone, vinyl sulfate, methylene methanedisulfonate, propylene sultone, tris (trimethyl alkane) borate and tris (trimethyl alkane) phosphate, succinonitrile, adiponitrile, 1,3, 6-hexanetrinitrile, one of which is at least fluoroethylene carbonate.
Optionally, the content of the fluoroethylene carbonate accounts for 0.5-20 wt% of the total mass of the electrolyte, and the total content of other components of the film forming additive accounts for 0.1-8 wt% of the total mass of the electrolyte.
Optionally, the lithium salt additive is selected from two or more of lithium difluorophosphate, lithium difluoro (trifluoromethylsulfonyl) imide, lithium bis (fluorosulfonyl) imide, lithium tetrafluoroborate, lithium bis (oxalato) borate, and lithium difluoro (oxalato) borate, wherein one has at least lithium difluoro (trifluoromethylsulfonyl) imide.
Optionally, the content of the lithium difluoro (trifluoromethylsulfonyl) imide accounts for 0.5-5 wt% of the total mass of the electrolyte, and the total content of other components of the lithium salt additive accounts for 0.1-3 wt% of the total mass of the electrolyte.
Optionally, the lithium salt is lithium hexafluorophosphate, and the concentration of lithium hexafluorophosphate in the electrolyte is 0.5M to 2M.
Optionally, the solvent is selected from two or more of ethylene carbonate, propylene carbonate, dimethyl carbonate, diethyl carbonate, ethyl methyl carbonate, methyl formate, ethyl propionate, propyl propionate, methyl butyrate, and tetrahydrofuran.
The invention also discloses a lithium ion battery which comprises a positive plate, a negative plate, a diaphragm and the electrolyte.
Optionally, the positive electrode sheet includes a positive electrode current collector and a positive electrode membrane, the positive electrode membrane includes a positive electrode active material, a conductive agent and a binder, and the positive electrode active material is LiNi1-x-y-zCoxMnyAlzO2(ii) a Wherein 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, and x + y + z is more than or equal to 0 and less than or equal to 1.
According to the lithium ion battery electrolyte, the additive A effectively prevents the transition metal of the anode material from dissolving out at high temperature, so that the stability of the anode material structure is effectively protected; the additive B can be preferentially reduced on the surface of the negative electrode to participate in the formation of a negative electrode SEI film, the formed SEI film is rich in B-O bonds with stronger mechanical property and better toughness, the continuous repair capability of the SEI film in the circulation process is improved, and the circulation performance of the battery is effectively improved; the film-forming agent can prevent the electrode interface from directly contacting with the electrolyte to generate side reaction, and the cycle performance of the battery is effectively improved; the lithium salt additive can improve an SEI film, improve the first effect and the cycle performance of the battery, and remarkably improve the high-temperature cycle performance of the battery. The four substances can be mutually influenced when being jointly used in the electrolyte, compared with the situation that only one or two or three substances are used, the performance of the electrolyte can be effectively improved, a good synergistic effect is achieved, the film forming performance of the electrolyte on the surface of a negative electrode is excellent, the additive can effectively remove acidic byproducts of the electrolyte and stabilize the structure of a positive electrode material, and therefore the high-temperature cycle performance, the high-temperature storage performance and the like of the lithium ion battery are effectively improved.
Detailed Description
It is to be understood that the terminology, the specific structural and functional details disclosed herein are for the purpose of describing particular embodiments only, and are not intended to be limiting, since the present invention may be embodied in many alternate forms and should not be construed as limited to only the embodiments set forth herein.
The invention is described in detail below with reference to alternative embodiments.
As an embodiment of the present invention, a lithium ion battery electrolyte includes a lithium salt, a solvent, and additives, where the additives include an additive a, an additive B, a film-forming additive, and a lithium salt additive; the general formula of the additive A is shown as the following formula I, and the general formula of the additive B is shown as the following formula II:
Figure BDA0003737988390000041
wherein R is1Selected from partially or fully substituted by nitrile groupsAlkyl of 1 to 3 carbon atoms, R2、R3、R4、R5Any one selected from fluorine atom, hydrogen atom and nitrile group; x1, X2 and X3 are selected from any one of alkyl, halogenated alkyl, alkenyl, alkynyl, aromatic and halogenated aromatic.
Specifically, the content of the additive A accounts for 0.1-3 wt% of the total mass of the electrolyte; and/or the content of the additive B accounts for 0.1 to 3 weight percent of the total mass of the electrolyte.
Specifically, the film-forming additive is selected from two or more of fluoroethylene carbonate (FEC), vinylene Carbonate (VC), 1, 3-Propane Sultone (PS), vinyl sulfate (DTD), methylene Methanedisulfonate (MMDS), propene Sultone (PST), tris (trimethylalkane) borate (TMSB), tris (trimethylalkane) phosphate (TMSP), succinonitrile (SN), adiponitrile (ADN), 1,3, 6-Hexane Trinitrile (HTCN), one of which has at least FEC.
Specifically, the content of FEC accounts for 0.5-20 wt% of the total mass of the electrolyte, and the total content of other components of the film-forming additive accounts for 0.1-8 wt% of the total mass of the electrolyte.
Specifically, the lithium salt additive is selected from lithium difluorophosphate (LiPO)2F2) Lithium difluoro (trifluoromethylsulfonyl) imide (LiTFSI), lithium bis (fluorosulfonyl) imide (LiFSI), lithium tetrafluoroborate (LiBF)4) Two or more of lithium bis (oxalato) borate (LiBOB) and lithium difluoro (oxalato) borate (lidob), wherein at least one of them is lithium difluoro (trifluoromethylsulfonyl) imide (LiTFSI).
Specifically, the content of difluoro (trifluoromethyl sulfonyl) lithium imide (LiTFSI) accounts for 0.5-5 wt% of the total mass of the electrolyte, and the total content of other components of the lithium salt additive accounts for 0.1-3 wt% of the total mass of the electrolyte.
Specifically, the lithium salt is lithium hexafluorophosphate (LiPF)6) Lithium hexafluorophosphate (LiPF)6) The concentration in the electrolyte is 0.5M-2M.
Specifically, the solvent is selected from two or more of ethylene carbonate, propylene carbonate, dimethyl carbonate, diethyl carbonate, ethyl methyl carbonate, methyl formate, ethyl propionate, propyl propionate, methyl butyrate and tetrahydrofuran.
The invention also discloses a lithium ion battery which comprises a positive plate, a negative plate, a diaphragm and the electrolyte.
Preferably, the negative electrode sheet includes a negative electrode current collector and a negative electrode membrane, the negative electrode membrane includes a negative active material, a conductive agent and a binder, the negative active material is selected from graphite and/or silicon, such as natural graphite, artificial graphite, mesophase micro carbon spheres (MCMB), hard carbon, soft carbon, silicon or SiOwSilicon-carbon composite material (w is more than 1 and less than 2) compounded with graphite, li-Sn alloy, li-Sn-O alloy, sn, snO and SnO2Spinel-structured lithiated TiO2-Li4Ti5O12And Li-Al alloy.
Specifically, the positive pole piece comprises a positive current collector and a positive diaphragm, the positive diaphragm comprises a positive active substance, a conductive agent and a binder, and the positive active substance is LiNi1-x-y-zCoxMnyAlzO2(ii) a Wherein 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, and x + y + z is more than or equal to 0 and less than or equal to 1.
Preferably, the binder comprises polyvinyl alcohol, hydroxypropyl cellulose, diacetyl cellulose, polyvinyl chloride, carboxylated polyvinyl chloride, polyvinyl fluoride, ethylene oxide containing polymers, polyvinyl pyrrolidone, polyurethane, polytetrafluoroethylene, polyvinylidene 1, 1-difluoroethylene, polyethylene, polypropylene, styrene-butadiene rubber, acrylated styrene-butadiene rubber, epoxy, nylon, and the like.
Preferably, the conductive agent includes a carbon-based material such as natural graphite, artificial graphite, carbon black, acetylene black, ketjen black, carbon fiber, or the like; metal-based materials such as metal powders, metal fibers, and the like, including, for example, copper, nickel, aluminum, silver, and the like, are also possible. Conductive polymers such as polyphenylene derivatives and mixtures of polyphenylene derivatives.
According to the lithium ion battery electrolyte, the additive A effectively prevents the transition metal of the anode material from dissolving out at high temperature, so that the stability of the anode material structure is effectively protected; the additive B can be preferentially reduced on the surface of the negative electrode to participate in the formation of the negative electrode SEI film, the formed SEI film is rich in B-O bonds with stronger mechanical property and better toughness, the continuous repair capability of the SEI film in the circulating process is improved, and the circulating performance of the battery is effectively improved; the film forming agent can prevent the electrode interface from directly contacting with the electrolyte to generate side reaction, and effectively improves the cycle performance of the battery; the lithium salt additive can improve an SEI film, improve the first effect and the cycle performance of the battery, and remarkably improve the high-temperature cycle performance of the battery. The four substances can be mutually influenced when being jointly used in the electrolyte, compared with the situation that only one or two or three substances are used, the performance of the electrolyte can be effectively improved, a good synergistic effect is achieved, the film forming performance of the electrolyte on the surface of a negative electrode is excellent, the additive can effectively remove acidic byproducts of the electrolyte and stabilize the structure of a positive electrode material, and therefore the high-temperature cycle performance, the high-temperature storage performance and the like of the lithium ion battery are effectively improved.
The present invention will be further described with reference to specific examples.
Examples
This embodiment is used to illustrate a lithium ion battery and a method for manufacturing the same disclosed in the present invention, and includes the following operation steps:
preparing an electrolyte: EC, DEC, and PC were mixed at a mass ratio of 1. Adding the additive with the mass percentage content shown in the example 1 in the table 1 into the organic solvent, uniformly mixing, and adding LiPF6Obtaining LiPF6An electrolyte solution having a concentration of 1.1 mol/L.
Manufacturing a positive plate: a positive electrode active material (LiNi)0.5Mn0.3Co0.2O2The conductive agent CNT (Carbon Nanotube) and the binder PVDF (polyvinylidene fluoride) were sufficiently stirred and mixed in an N-methylpyrrolidone solvent at a mass ratio of 97. And coating the slurry on an aluminum foil of the positive current collector, drying, and performing cold pressing to obtain the positive plate.
And (3) manufacturing a negative plate: fully stirring and mixing a negative electrode active material silicon-oxygen-carbon composite material, a conductive agent acetylene black, a binder styrene butadiene rubber and a thickening agent carboxymethylcellulose sodium in a proper amount of deionized water solvent according to the mass ratio of 95. And coating the slurry on a copper foil of a negative current collector, drying, and performing cold pressing to obtain a negative plate.
Manufacturing the lithium ion battery: the PE porous polymer film is used as a separator.
And sequentially stacking the positive pole piece, the diaphragm and the negative pole piece to enable the diaphragm to be positioned between the positive pole and the negative pole, so as to play a role in isolation, and then winding the stacked pole pieces and the diaphragm to obtain the winding core. And placing the winding core in an aluminum plastic film bag which is formed by punching a shell, respectively injecting the prepared electrolyte into the baked and dried battery core, and completing the preparation of the lithium ion battery through the procedures of vacuum packaging, standing, formation and the like.
TABLE 1
Figure BDA0003737988390000081
The difference between the embodiments 1 to 5 is that: the contents of the additives added to the organic solvent in the preparation operation of the electrolyte are different, and are specifically shown in table 1. Comparative examples 1 to 7 are for comparative illustration of the lithium ion battery electrolyte disclosed in the present invention.
And (3) testing the battery:
the lithium ion batteries prepared in the above examples 1 to 5 and comparative examples 1 to 7 were subjected to the following performance tests:
45 ℃ cycle test of the battery:
the test method comprises the following steps: charging the lithium ion battery to 4.45V with a constant current of 1C and a constant voltage in a constant temperature box at the temperature of 45 +/-2 ℃, stopping the current to 0.05C, then discharging the lithium ion battery to 3V with 0.5C, and carrying out multiple charging and discharging cycles according to the conditions. The capacity retention after 50 cycles, 100 cycles, 300 cycles and 500 cycles of the cells was calculated for 5 cells each.
Capacity retention (%) = discharge capacity (mAh) corresponding cycle number/discharge capacity (mAh) at cycle three × 100%
The average of the capacity retention after different cycles of each group of 5 batteries was recorded in table 2.
TABLE 2
Battery cell number 50 times 100 times (twice) 300 times (twice) 500 times (times)
Comparative example 1 93.2 88.7 73.1 55.8
Comparative example 2 94.5 90.0 76.6 60.3
Comparative example 3 94.7 90.2 76.3 60.9
Comparative example 4 95.6 91.1 77.9 61.8
Comparative example 5 95.1 90.8 78.1 62.6
Comparative example 6 95.7 92.2 81.1 72.6
Comparative example 7 95.3 93.6 82.4 73.9
Example 1 96.2 94.8 91.5 85.1
Example 2 96.3 95.2 91.9 85.5
Example 3 96.6 94.3 92.8 86.9
Example 4 96.8 94.1 90.7 84.4
Example 5 96.5 94.5 90.5 83.9
As can be seen by combining the data in tables 1 and 2, the addition of one of the above four additives alone to the electrolytes of comparative examples 2, 3, 4 and 5 results in a slight improvement in the cycle performance of the battery as compared to comparative example 1. Comparative examples 6 and 7 the performance of the battery was further improved by adding two of the above four additives. In examples 1, 2, 3, 4 and 5, when the four additives are used together, the four additives have a synergistic effect, and the cycle performance of the battery is remarkably improved.
High temperature storage test of the battery:
the test method comprises the following steps: charging a full-electric-state battery cell at 0.7C to 4.45V at constant current and constant voltage, placing the battery cell at a cut-off current of 0.05C for 18h at 85 ℃, and taking out the battery cell for testing the thermal-state thickness, voltage and internal resistance after 12h; discharging to 3.0V at constant current of 0.2C, and recording recovery capacity for 3 weeks, and taking the capacity for the third week.
TABLE 3
Cell number 18h thickness expansion rate in high temperature storage High temperature storage 18h recovery capacity rate
Comparative example 1 14.5％ 82.6％
Comparative example 2 12.9％ 83.5％
Comparative example 3 12.7％ 82.9％
Comparative example 4 14.8％ 82.5％
Comparative example 5 13.3％ 83.9％
Comparative example 6 13.7％ 84.5％
Comparative example 7 12.8％ 85.1％
Example 1 7.1％ 93.8％
Example 2 6.9％ 95.2％
Example 3 6.4％ 94.9％
Example 4 7.3％ 95.1％
Example 5 6.8％ 94.3％
The data in table 3 show that, compared with the lithium ion batteries provided in comparative examples 1 to 7, the high-temperature storage performance of the lithium ion battery adopting the technical scheme of the present application is greatly improved. When only one additive or two additives are added, the high-temperature storage performance is poor. Only when four additives are used simultaneously, the high-temperature storage performance is obviously improved.
The foregoing is a further detailed description of the invention in connection with specific alternative embodiments and is not intended to limit the invention to the specific embodiments described herein. For those skilled in the art to which the invention pertains, several simple deductions or substitutions can be made without departing from the spirit of the invention, and all shall be considered as belonging to the protection scope of the invention.

Claims (10)

1. The lithium ion battery electrolyte is characterized by comprising lithium salt, a solvent and additives, wherein the additives comprise an additive A, an additive B, a film forming additive and a lithium salt additive; the general formula of the additive A is shown as the following formula I, and the general formula of the additive B is shown as the following formula II:
Figure FDA0003737988380000011
wherein R is1Selected from alkyl of 1 to 3 carbon atoms partially or totally substituted by nitrile groups, R2、R3、R4、R5Any one selected from fluorine atoms, hydrogen atoms and nitrile groups; x1, X2 and X3 are selected from any one of alkyl, halogenated alkyl, alkenyl, alkynyl, aromatic and halogenated aromatic.
2. The lithium ion battery electrolyte of claim 1, wherein the additive a is present in an amount of 0.1 to 3wt% based on the total mass of the electrolyte; and/or the content of the additive B accounts for 0.1-3 wt% of the total mass of the electrolyte.
3. The lithium ion battery electrolyte of claim 1 wherein the film forming additive is selected from two or more of fluoroethylene carbonate, vinylene carbonate, 1, 3-propane sultone, vinyl sulfate, methylene methanedisulfonate, propene sultone, tris (trimethyl alkane) borate and tris (trimethyl alkane) phosphate, succinonitrile, adiponitrile, 1,3, 6-hexanetrinitrile, one of which is at least fluoroethylene carbonate.
4. The electrolyte for lithium ion batteries according to claim 3, wherein the fluoroethylene carbonate accounts for 0.5 to 20wt% of the total mass of the electrolyte, and the total content of other components of the film-forming additive accounts for 0.1 to 8wt% of the total mass of the electrolyte.
5. The lithium ion battery electrolyte of claim 1 wherein the lithium salt additive is selected from two or more of lithium difluorophosphate, lithium difluoro (trifluoromethylsulfonyl) imide, lithium bis (fluorosulfonyl) imide, lithium tetrafluoroborate, lithium bis (oxalato) borate, and lithium difluoro (oxalato) borate, one of which is at least lithium difluoro (trifluoromethylsulfonyl) imide.
6. The lithium ion battery electrolyte of claim 5, wherein the lithium difluoro (trifluoromethylsulfonyl) imide is present in an amount of 0.5 to 5wt% based on the total mass of the electrolyte, and the total amount of the other components of the lithium salt additive is present in an amount of 0.1 to 3wt% based on the total mass of the electrolyte.
7. The lithium ion battery electrolyte of claim 1 wherein the lithium salt is lithium hexafluorophosphate, the concentration of the lithium hexafluorophosphate in the electrolyte being 0.5M to 2M.
8. The lithium ion battery electrolyte of claim 1 wherein the solvent is selected from two or more of ethylene carbonate, propylene carbonate, dimethyl carbonate, diethyl carbonate, ethyl methyl carbonate, methyl formate, ethyl propionate, propyl propionate, methyl butyrate, and tetrahydrofuran.
9. A lithium ion battery comprising a positive electrode sheet, a negative electrode sheet, a separator and the electrolyte according to any one of claims 1 to 8.
10. The lithium ion battery of claim 9, wherein: the positive pole piece comprises a positive current collector and a positive diaphragm, the positive diaphragm comprises a positive active substance, a conductive agent and a binder, and the positive active substance is LiNi1-x-y-zCoxMnyAlzO2(ii) a Wherein 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, and x + y + z is more than or equal to 0 and less than or equal to 1.
CN202210808269.7A 2022-07-08 2022-07-08 Lithium ion battery electrolyte and lithium ion battery Pending CN115275342A (en)

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