CN113363582B - Electrolyte for improving overcharge safety performance of lithium ion battery and application thereof - Google Patents

Electrolyte for improving overcharge safety performance of lithium ion battery and application thereof Download PDF

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CN113363582B
CN113363582B CN202110710591.1A CN202110710591A CN113363582B CN 113363582 B CN113363582 B CN 113363582B CN 202110710591 A CN202110710591 A CN 202110710591A CN 113363582 B CN113363582 B CN 113363582B
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electrolyte
lithium
ion battery
lithium ion
additive
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CN113363582A (en
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徐秋红
宋鹏元
罗列科
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Eve Energy Co Ltd
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Eve Energy 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
    • 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

Abstract

The invention relates to an electrolyte for improving overcharge safety performance of a lithium ion battery and application thereof, wherein the electrolyte comprises an organic solvent, lithium salt and an additive, and the additive comprises at least two of lithium dioxalate borate, tri (trimethylsilane) phosphate and adiponitrile; the additives have synergistic effect, so that the overcharge safety performance of the lithium ion battery assembled by the electrolyte obtained by the additives is obviously improved, and the lithium ion battery assembled by the electrolyte has excellent cycle performance.

Description

Electrolyte for improving overcharge safety performance of lithium ion battery and application thereof
Technical Field
The invention belongs to the field of lithium batteries, and relates to an electrolyte for improving overcharge safety performance of a lithium ion battery and application thereof.
Background
The overcharge safety performance of cylindrical ternary batteries has been an important issue for the industry, and as cylindrical batteries develop in the electric tool market, they are increasingly concerned with the safety performance of modular overcharging. Many workers adopt the use or mixed use of the overcharge additives Biphenyl (BP), cyclohexylbenzene (CHB) and Fluorophenyl (FB), can generate overcharge polymerization when the battery is overcharged, and block the charging of current, thereby effectively avoiding the ignition or explosion phenomenon caused by overcharging the cylindrical ternary battery; however, the addition of the overcharge additive has obvious negative effects on the performance of the battery cell, influences the internal resistance of the battery cell, accelerates the attenuation of the cycle performance and has low high-temperature storage and retention rate, and the application of the overcharge additive is restricted.
CN101308939a discloses an anti-overcharging lithium ion battery electrolyte, which adopts an additive which is an alkyl aromatic hydrocarbon organic compound, and comprises the following components in weight ratio: 92-97% of lithium ion battery electrolyte organic solvent, 3-8% of alkyl aromatic hydrocarbon organic compound, wherein the alkyl aromatic hydrocarbon organic compound comprises one or more of biphenyl, cyclohexylbenzene and fluorophenyl; the battery assembled by the electrolyte can not generate smoke and explosion during charging, but the addition of the additive has a great adverse effect on the cycle performance of the lithium ion battery.
CN101093901a discloses a composition of lithium ion battery electrolyte with overcharge and flatulence prevention, the composition of the electrolyte comprises ethylene carbonate, methyl ethyl carbonate, diethyl carbonate, cyclohexylbenzene, vinylene carbonate, 1, 3-propane sultone and lithium hexafluorophosphate; among them, the addition of cyclohexylbenzene is advantageous for improving overcharge performance, but has a great adverse effect on cycle performance of lithium ion batteries.
Therefore, development of the lithium ion battery electrolyte which can obviously improve the overcharge safety performance of the lithium ion battery and has small influence on the battery cycle performance is of great significance.
Disclosure of Invention
The invention aims to provide an electrolyte for improving overcharge safety performance of a lithium ion battery and application thereof, wherein the electrolyte comprises an organic solvent, lithium salt and an additive, and the additive comprises at least two of lithium dioxalate borate, tri (trimethylsilane) phosphate and adiponitrile; the additives have synergistic effect, so that the overcharge safety performance of the lithium ion battery assembled by the electrolyte obtained by the additives is obviously improved, and the lithium ion battery assembled by the electrolyte has excellent cycle performance.
In order to achieve the aim of the invention, the invention adopts the following technical scheme:
in a first aspect, the invention provides an electrolyte for improving overcharge safety performance of a lithium ion battery, wherein the electrolyte comprises an organic solvent, lithium salt and an additive; the additive comprises at least two of lithium dioxalate borate (LiBOB), tris (trimethylsilane) phosphate (TMSP), and Adiponitrile (ADN); the additives illustratively include a combination of LiBOB and TMSP, a combination of ADN and LiBOB, a combination of TMSP and ADN, or a combination of LiBOB, TMSP and ADN.
The additive is added into the electrolyte, and the synergistic effect of the additives reduces the temperature rise of the lithium ion battery during overcharging, so that the safety performance of the battery is improved, and the battery assembled by the battery can pass the single overcharge test.
Preferably, the content of LiBOB is 0.1 to 5% by mass, for example 0.2%, 0.5%, 0.8%, 1%, 1.3%, 1.5%, 1.8%, 2%, 2.3%, 2.5%, 2.8%, 3%, 3.2%, 3.5%, 3.8%, 4%, 4.5% or 4.8% by mass, etc., preferably 0.5 to 2% by mass, based on 100% by mass of the electrolyte.
Preferably, the TMSP is present in an amount of 0.1-2% by mass, e.g. 0.2%, 0.5%, 0.6%, 0.7%, 0.8%, 0.9%, 1%, 1.2%, 1.5% or 1.8% by mass, based on 100% by mass of the electrolyte, preferably 0.5-1%.
Preferably, the ADN is present in an amount of 0.1-2% by mass, e.g. 0.2%, 0.5%, 0.8%, 1%, 1.2%, 1.5% or 1.8% etc., preferably 1-2% by mass, based on 100% by mass of the electrolyte.
Preferably, the additive comprises lithium dioxalate borate, TMSP and adiponitrile.
Preferably, the additive comprises the following components in percentage by mass, based on 100% by mass of the electrolyte:
LiBOB 0.1-5％
TMSP 0.1-2％
ADN 0.1-2％。
the electrolyte adopts the composition, and the mass percentage of LiBOB is 0.1-5%, such as 0.2%, 0.5%, 1%, 2%, 3% or 4% and the like, calculated by taking the mass of the electrolyte as 100%; TMSP is 0.1-2% by mass, e.g. 0.2%, 0.5%, 0.8%, 1%, 1.2%, 1.5% or 1.8% etc.; the ADN content is 0.1-2% by mass, such as 0.2%, 0.5%, 0.8%, 1%, 1.2%, 1.5% or 1.8%.
The additives in the electrolyte provided by the invention have the above components and have a synergistic effect, so that the lithium ion battery assembled by adopting the electrolyte has excellent cycle performance, and meanwhile, the overcharge safety performance of the lithium ion battery is effectively improved.
Preferably, the organic solvent includes Ethylene Carbonate (EC), dimethyl carbonate (DMC) and ethylmethyl carbonate (EMC).
Preferably, the organic solvent comprises the following components in percentage by volume, based on 100% of the volume of the organic solvent:
20 to 30 percent of ethylene carbonate
50-70% of dimethyl carbonate
0-20% of methyl ethyl carbonate.
Here, the volume percentage of the ethylene carbonate is 20 to 30%, for example, 22%, 25% or 28%, etc., based on 100% of the volume of the organic solvent; the dimethyl carbonate is 50-70% by volume, such as 52, 55, 57, 60, 62, 65 or 68; the volume percentage of the methyl ethyl carbonate is 0-20%, such as 1%, 3%, 5%, 7%, 9%, 11%, 13%, 15% or 18%, etc.
The organic solvent in the electrolyte adopts the combination of the three solvents, which is beneficial to improving the cycle performance of the battery, reducing the temperature rise of the lithium ion battery caused by overcharging and improving the safety of the battery.
Preferably, the lithium salt comprises lithium bis-fluorosulfonyl imide (LiPSI) and/or LiPF 6 Preferred are lithium bis-fluorosulfonyl imide and LiPF 6 。
Preferably, the concentration of lithium salt in the electrolyte is 0.8-1.5M, e.g. 0.9M, 1M, 1.1M, 1.2M, 1.3M or 1.4M, etc.
Preferably, the additive further comprises Methylene Methane Disulfonate (MMDS), fluoroethylene carbonate (FEC), vinylene Carbonate (VC), vinyl sulfate (DTD), succinonitrile (SN) or LiPF 2 O 2 Any one or a combination of at least two of the above, the combination illustratively includes a combination of MMDS and FEC, a combination of VC and DTD, or SN and LiPF 2 O 2 Combinations of (a) and the like.
Preferably, the MMDS is 0-1% by mass, e.g., 0.1%, 0.2%, 0.3%, 0.4%, 0.5%, 0.6%, 0.7%, 0.8%, or 0.9% by mass, based on 100% by mass of the electrolyte.
Preferably, the FEC is present in a mass percentage of 1-5%, e.g. 1.5%, 2%, 2.5%, 3%, 3.5%, 4% or 4.5% based on 100% of the electrolyte mass.
Preferably, the mass percentage of VC is 0.1-1%, for example 0.3%, 0.4%, 0.5%, 0.6%, 0.7%, 0.8% or 0.9%, etc., based on 100% of the mass of the electrolyte.
Preferably, the DTD is 0.1-2% by mass, e.g. 0.3%, 0.6%, 0.7%, 0.8%, 0.9%, 1%, 1.1%, 1.2%, 1.3%, 1.4%, 1.5%, 1.6%, 1.7%, 1.8% or 1.9% by mass of the electrolyte based on 100% by mass of the electrolyte.
Preferably, the mass percentage of SN is 0.1-2%, for example 0.3%, 0.6%, 0.7%, 0.8%, 0.9%, 1%, 1.1%, 1.2%, 1.3%, 1.4%, 1.5%, 1.6%, 1.7%, 1.8% or 1.9%, etc., based on 100% of the mass of the electrolyte.
Preferably, the LiPF is 100% by mass of the electrolyte 2 O 2 The mass percentage of (C) is 0.1-2%, for example 0.3%, 0.6%, 0.7%, 0.8%, 0.9%, 1%, 1.1%, 1.2%, 1.3%, 1.4%, 1.5%, 1.6%, 1.7%, 1.8% or 1.9%.
In a second aspect, the present invention provides a lithium ion battery comprising a positive electrode, a negative electrode, a separator and an electrolyte, the electrolyte employing the electrolyte according to the first aspect.
Preferably, the positive electrode of the lithium ion battery comprises a ternary material.
Preferably, the ternary material comprises a nickel cobalt manganese ternary material.
Preferably, the negative electrode comprises a graphite-based material.
The lithium ion battery provided by the invention adopts the electrolyte in the first aspect, so that the lithium ion battery maintains excellent cycle performance, and meanwhile, the overcharge safety of the lithium ion battery is effectively improved.
The method for assembling the lithium ion battery comprises the following steps:
(1) Mixing an anode active material and a cathode active material with a conductive agent, a binder and a solvent respectively to prepare anode conductive paste and cathode conductive paste respectively;
(2) Coating the positive electrode conductive paste and the negative electrode conductive paste in the step (1) on an aluminum foil and a copper foil respectively, drying in a dry environment, cold pressing, slitting and tabletting to obtain a positive electrode plate and a negative electrode plate;
(3) And stacking and winding the diaphragm, the negative plate, the diaphragm and the positive plate into a columnar pole group according to the sequence of the diaphragm, the negative plate, the diaphragm and the positive plate, then placing the columnar pole group into a steel shell, injecting a proper amount of electrolyte, sealing and forming the electrolyte into a component, and obtaining the lithium ion battery.
Compared with the prior art, the invention has the following beneficial effects:
(1) The additive in the electrolyte for improving the overcharge safety performance of the lithium ion battery comprises at least two of lithium dioxalate borate, tri (trimethylsilane) phosphate and adiponitrile, and the additive has a synergistic effect, so that the overcharge safety performance of the lithium ion battery assembled by the obtained electrolyte is obviously improved;
(2) The electrolyte for improving the overcharge safety performance of the lithium ion battery is used for assembling the lithium ion battery, and the obtained lithium ion battery has excellent cycle performance.
Drawings
FIG. 1 is a graph showing the temperature change over time of a single overcharge test performed on a lithium ion cylindrical battery assembled from the electrolytes described in examples 1-4 of the present invention;
FIG. 2 is a graph showing the temperature change over time of the lithium ion cylindrical batteries assembled with the electrolyte according to example 1 and comparative examples 1 to 4 according to the present invention, when the lithium ion cylindrical batteries were subjected to the single overcharge test;
FIG. 3 is a graph showing the cycle performance test of the lithium ion cylindrical battery assembled by the electrolyte in example 1 and example 5 of the present invention;
fig. 4 is a graph showing the high-temperature storage performance test of the lithium ion cylindrical battery assembled by the electrolyte described in example 1 and example 5 of the present invention.
Detailed Description
The technical scheme of the invention is further described by the following specific embodiments. It will be apparent to those skilled in the art that the examples are merely to aid in understanding the invention and are not to be construed as a specific limitation thereof.
Example 1
The electrolyte in this embodiment contains an organic solvent, a lithium salt and an additive;
wherein the organic solvent comprises EC, EMC and DMC, and the volume ratio of EC, EMC and DMC is 2:2:6;
the lithium salt is LiPF 6 And LiFeSi, liPF in electrolyte 6 And LiFeSi are 0.5M in molar concentration;
the additive comprises the following components in percentage by mass of 100% of the electrolyte:
in the preparation process of the electrolyte in this embodiment, lithium salt and additives are dissolved in an organic solvent to obtain the electrolyte.
The lithium ion cylindrical battery assembled by the electrolyte in this embodiment is subjected to a single body overcharge test, a cycle performance test and a high-temperature storage performance test, and the test results are shown in fig. 1 to 4.
Example 2
The electrolyte in this embodiment contains an organic solvent, a lithium salt and an additive;
wherein the organic solvent comprises EC, EMC and DMC, and the volume ratio of EC, EMC and DMC is 2:2:6;
the lithium salt is LiPF 6 And LiFeSi, liPF in electrolyte 6 And LiFeSi are 0.5M in molar concentration;
the additive comprises the following components in percentage by mass of 100% of the electrolyte:
the method for preparing the electrolyte in this example is exactly the same as in example 1.
The lithium ion cylindrical battery assembled by the electrolyte in this example was subjected to a single overcharge test, and the test result is shown in fig. 1.
Example 3
The electrolyte in this embodiment contains an organic solvent, a lithium salt and an additive;
wherein the organic solvent comprises EC, EMC and DMC, and the volume ratio of EC, EMC and DMC is 2:2:6;
the lithium salt is LiPF 6 And LiFeSi, liPF in electrolyte 6 And LiFeSi are 0.5M in molar concentration;
the additive comprises the following components in percentage by mass of 100% of the electrolyte:
the method for preparing the electrolyte in this example is exactly the same as in example 1.
The lithium ion cylindrical battery assembled by the electrolyte in this example was subjected to a single overcharge test, and the test result is shown in fig. 1.
Example 4
The electrolyte in this embodiment contains an organic solvent, a lithium salt and an additive;
wherein the organic solvent comprises EC, EMC and DMC, and the volume ratio of EC, EMC and DMC is 2:2:6;
the lithium salt is LiPF 6 And LiFeSi, liPF in electrolyte 6 And LiFeSi are 0.5M in molar concentration;
the additive comprises the following components in percentage by mass of 100% of the electrolyte:
the method for preparing the electrolyte in this example is exactly the same as in example 1.
The lithium ion cylindrical battery assembled by the electrolyte in this example was subjected to a single overcharge test, and the test result is shown in fig. 1.
Example 5
The electrolyte in this embodiment contains an organic solvent, a lithium salt and an additive;
wherein the organic solvent comprises EC, EMC and DMC, and the volume ratio of EC, EMC and DMC is 2:2:6;
the lithium salt is LiPF 6 LiPF in electrolyte 6 The molar concentration of (2) is 1M;
the additive comprises the following components in percentage by mass of 100% of the electrolyte:
the method for preparing the electrolyte in this example is exactly the same as in example 1.
The lithium ion cylindrical battery assembled by the electrolyte in this embodiment is subjected to a cycle performance test and a high-temperature storage performance test, and the test results are shown in fig. 3 and 4.
Comparative example 1
The electrolyte of the comparative example comprises an organic solvent, lithium salt and an additive;
wherein the organic solvent comprises EC, EMC and DMC, and the volume ratio of EC, EMC and DMC is 2:2:6;
the lithium salt is LiPF 6 And LiFeSi, liPF in electrolyte 6 And LiFeSi are 0.5M in molar concentration;
the additive comprises the following components in percentage by mass of 100% of the electrolyte:
the method for producing the electrolyte in this comparative example was exactly the same as in example 1.
The lithium ion cylindrical battery assembled by the electrolyte of the comparative example is subjected to a single overcharge test, and the test result is shown in fig. 2.
Comparative example 2
The electrolyte of the comparative example comprises an organic solvent, lithium salt and an additive;
wherein the organic solvent comprises EC, EMC and DMC, and the volume ratio of EC, EMC and DMC is 2:2:6;
the lithium salt is LiPF 6 And LiFeSi, liPF in electrolyte 6 And LiFeSi are 0.5M in molar concentration;
the additive comprises the following components in percentage by mass of 100% of the electrolyte:
in the preparation of the electrolyte in this comparative example, lithium salt and additives were dissolved in an organic solvent to obtain the electrolyte.
The lithium ion cylindrical battery assembled by the electrolyte of the comparative example is subjected to a single overcharge test, and the test result is shown in fig. 2.
Comparative example 3
The electrolyte of the comparative example comprises an organic solvent, lithium salt and an additive;
wherein the organic solvent comprises EC, EMC and DMC, and the volume ratio of EC, EMC and DMC is 2:2:6;
the lithium salt is LiPF 6 And LiFeSi, liPF in electrolyte 6 And LiFeSi are 0.5M in molar concentration;
the additive comprises the following components in percentage by mass of 100% of the electrolyte:
VC 0.5％
FEC 1％
LiPF 2 O 2 1％。
the lithium ion cylindrical battery assembled by the electrolyte of the comparative example is subjected to a single overcharge test, and the test result is shown in fig. 2.
Comparative example 4
The electrolyte of the comparative example comprises an organic solvent, lithium salt and an additive;
wherein the organic solvent comprises EC, EMC and DMC, and the volume ratio of EC, EMC and DMC is 2:2:6;
the lithium salt is LiPF 6 And LiFeSi, liPF in electrolyte 6 And LiFeSi are 0.5M in molar concentration;
the additive comprises the following components in percentage by mass of 100% of the electrolyte:
the lithium ion cylindrical battery assembled by the electrolyte of the comparative example is subjected to a single overcharge test, and the test result is shown in fig. 2.
Comparative example 5
The electrolyte of the comparative example comprises an organic solvent, lithium salt and an additive;
wherein the organic solvent comprises EC, EMC and DMC, and the volume ratio of EC, EMC and DMC is 2:2:6;
the lithium salt is LiPF 6 And LiFeSi, liPF in electrolyte 6 And LiFeSi are 0.5M in molar concentration;
the additive comprises the following components in percentage by mass of 100% of the electrolyte:
the lithium ion cylindrical battery obtained by assembling the electrolyte in the comparative example is subjected to a cycle performance test and a high-temperature storage performance test, and the test results are shown in fig. 3 and 4.
Comparative example 6
The electrolyte of the comparative example comprises an organic solvent, lithium salt and an additive;
wherein the organic solvent comprises EC, EMC and DMC, and the volume ratio of EC, EMC and DMC is 2:2:6;
the lithium salt is LiPF 6 And LiFeSi, liPF in electrolyte 6 And LiFeSi are 0.5M in molar concentration;
the additive comprises the following components in percentage by mass of 100% of the electrolyte:
the lithium ion cylindrical battery obtained by assembling the electrolyte in the comparative example is subjected to a cycle performance test and a high-temperature storage performance test, and the test results are shown in fig. 3 and 4.
Performance test:
the electrolytes of examples and comparative examples were used to assemble lithium ion cylindrical batteries in which the positive electrode activity was nickel cobalt manganese ternary material (NCM 811) and the negative electrode active material was graphene; assembling the lithium ion battery to obtain a lithium ion cylindrical battery, and testing the cycle performance and overcharge safety performance of the lithium ion cylindrical battery;
pretreatment before testing, and constant current discharge of 0.4A to 2.5V at normal temperature.
The test of the overcharge safety performance is a monomer overcharge test, and the test method is as follows;
the test conditions for monomer overcharge were: 4.1C constant current charging to 7.5V, @ RT, continuous charging for 7h or no voltage increase;
cycle performance test conditions: at normal temperature, the voltage is 2.5-4.2V in 2C/10C cycle (high-rate cycle, 2C charge and 10C discharge).
High temperature storage performance test conditions: stored at 60℃for 30 days (100% SOC).
The results of the single overcharge test performed on the lithium ion cylindrical batteries in the embodiments 1-5 show that the lithium ion cylindrical batteries assembled by the electrolyte in the embodiments 1-5 pass the test, and the test process does not generate fire, explode or leak;
the temperature change curves of the lithium ion cylindrical batteries in examples 1-4 with time are shown in fig. 1, and as can be seen from fig. 1, the electrolyte in examples 1 and 2 contains lithium dioxalate borate, tris (trimethylsilane) phosphate and adiponitrile, and the overcharge performance is better than that of the examples containing any two of the above materials;
the temperature change curves of the lithium ion cylindrical batteries of example 1 and comparative examples 1 to 4, which are subjected to the single overcharge test, with time are shown in fig. 2, and it can be seen from fig. 2 that the overcharge performance of example 1 is significantly better than that of comparative examples 1 to 4; as can be seen by comparing FIG. 1 with FIG. 2, the electrolyte additive of the invention contains at least two of lithium dioxaborate, tri (trimethylsilane) phosphate and adiponitrile, and the performance of the electrolyte additive is obviously better than that of the electrolyte additive which only contains one or no three of the above-mentioned overcharging additives
The lithium ion cylindrical batteries in examples 1, 5 and comparative examples 5 to 6 were subjected to cycle performance test, the test results are shown in fig. 3, and the test results show that the electrolyte of the invention is adopted in example 1 and example 5, the cycle retention rate of 200 weeks is above 95%, and the overcharge additive BP or CHB is added in comparative examples, the cycle of high-rate cycle 2C is charged, 10C is discharged, the cycle decay is accelerated, and the cycle is up to 140 weeks, so that water jump occurs.
The lithium ion cylindrical batteries in examples 1, 5 and comparative examples 5-6 were subjected to high temperature storage performance test, the test results are shown in fig. 4, and the test results show that the lithium ion cylindrical battery adopting the electrolyte provided by the invention has a capacity retention rate of 92% or more and a capacity recovery rate of 100% or more, and the comparative examples 5-6 are added with the overcharge additive BP or CHB, which has a remarkable negative effect on the high temperature storage performance.
The applicant declares that the above is only a specific embodiment of the present invention, but the scope of the present invention is not limited thereto, and it should be apparent to those skilled in the art that any changes or substitutions that are easily conceivable within the technical scope of the present invention disclosed by the present invention fall within the scope of the present invention and the disclosure.

Claims (12)

1. An electrolyte for improving the overcharge safety performance of a lithium ion battery is characterized by comprising an organic solvent, lithium salt and an additive; the additive comprises lithium dioxalate borate, tris (trimethylsilane) phosphate, adiponitrile and methylene methane disulfonate;
the additive comprises the following components in percentage by mass of 100% of the electrolyte:
2. the electrolyte of claim 1 wherein the organic solvent comprises ethylene carbonate, dimethyl carbonate, and ethyl methyl carbonate.
3. The electrolyte of claim 2, wherein the organic solvent comprises the following components in percentage by volume, based on 100% by volume of the organic solvent:
20 to 30 percent of ethylene carbonate
50-70% of dimethyl carbonate
0-20% of methyl ethyl carbonate.
4. The electrolyte of claim 1, wherein the lithium salt comprises lithium bis-fluorosulfonyl imide and/or LiPF 6 。
5. The electrolyte according to claim 4, wherein the lithium salt is bis-fluorosulfonyl imideLithium amide and LiPF 6 。
6. The electrolyte of claim 1 wherein the concentration of lithium salt in the electrolyte is 0.8M to 1.5M.
7. The electrolyte of claim 1 wherein the additive further comprises fluoroethylene carbonate, vinylene carbonate, vinyl sulfate, succinonitrile, or LiPF 2 O 2 Any one or a combination of at least two of these.
8. The electrolyte according to claim 7, wherein the fluoroethylene carbonate is 1 to 5% by mass based on 100% by mass of the electrolyte.
9. A lithium ion battery comprising a positive electrode, a negative electrode, a separator, and an electrolyte, wherein the electrolyte is the electrolyte according to any one of claims 1 to 8.
10. The lithium-ion battery of claim 9, wherein the positive electrode of the lithium-ion battery comprises a ternary material.
11. The lithium-ion battery of claim 10, wherein the ternary material comprises a nickel cobalt manganese ternary material.
12. The lithium-ion battery of claim 9, wherein the negative electrode comprises a graphite-based material.
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