Electrolyte additive composition, electrolyte and lithium ion battery

An electrolyte additive and lithium-ion battery technology, applied in the field of lithium-ion batteries, can solve problems such as deterioration of high-temperature performance and rate performance, increase in battery internal resistance, adverse effects of battery rate performance and low-temperature performance, etc.

Pending Publication Date: 2021-05-25
ZHEJIANG RES INST OF CHEM IND CO LTD +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] (1) Vinylene carbonate (VC): Patents CN107749492A, CN106207258A and CN106129456A disclose that VC can form a dense passivation film on the surface of graphite electrodes to improve the cycle stability of the battery. Free radical polymerization leads to a significant increase in the internal resistance of the battery, which adversely affects the battery rate performance and low-temperature performance;
[0006] (2) Fluorinated ethylene carbonate (FEC): Patents CN101640288A and CN102637894A disclose that FEC can form a dense passivation film on the surface of graphite electrodes to improve the cycle stability of the battery, but FEC may be accompanied by HF removal during the film formation process. The process of VC, which has similar film-forming characteristics to VC, did not fundamentally solve the problem of high battery impedance, and the high-temperature performance and rate performance deteriorated;
Commonly used negative electrode film-forming additives (such as VC) require that the additive can form a dense and stable interfacial film on the surface of the negative electrode to improve the normal temperature cycle and high temperature performance of the battery. Increase the interfacial impedance of the battery

Method used

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  • Electrolyte additive composition, electrolyte and lithium ion battery
  • Electrolyte additive composition, electrolyte and lithium ion battery
  • Electrolyte additive composition, electrolyte and lithium ion battery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0053] Preparation of the positive plate

[0054] Mix the positive electrode active material lithium nickel cobalt manganese oxide LiNi according to the mass ratio of 93:4:3 0.5 co 0.2 mn 0.3 o 2 Or lithium cobalt oxide LiCoO 2 , conductive carbon black Super-P and binder polyvinylidene fluoride (PVDF), and then disperse them in N-methyl-2-pyrrolidone (NMP) to obtain positive electrode slurry. The slurry is evenly coated on both sides of the aluminum foil, dried, calendered and vacuum-dried, and an aluminum lead-out wire is welded by an ultrasonic welder to obtain a positive plate.

[0055] Preparation of negative plate

[0056] Mix negative active material artificial graphite, conductive carbon black Super-P, binder styrene-butadiene rubber (SBR) and carboxymethyl cellulose (CMC) according to the mass ratio of 92:2:3:3, and then disperse them in the deionized water to obtain negative electrode slurry. The slurry is coated on both sides of the copper foil, dried, calend...

Embodiment 2

[0065] The specific operation is the same as that in Example 1, except that the additive composition used in this example is: 0.5% of compound 1 and 1.5% of VEC.

Embodiment 3

[0067] The specific operation is the same as that in Example 1, except that the additive composition used in this example is: 0.2% of compound 1 and 1% of VEC.

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Abstract

The invention discloses an electrolyte additive composition. The electrolyte additive composition comprises a first additive as shown in the following formula (I) and a second additive as shown in the following formula (II). The electrolyte additive composition can be used for a lithium ion battery electrolyte and can improve the rate cycle performance, the high-temperature performance and the cycle stability performance of a lithium ion battery at the same time.

Description

technical field [0001] The invention relates to a lithium ion battery, in particular to an electrolyte additive composition, an electrolyte containing the additive composition, and a lithium ion battery. Background technique [0002] Lithium-ion batteries have the advantages of high working voltage, high energy density, no memory effect, no pollution, and small self-discharge, and are widely used in 3C, energy storage, power batteries and other fields. The electrolyte is one of the key materials of lithium-ion batteries, and its role cannot be ignored. Additives are an important part of the electrolyte and are the most economical and effective way to improve battery performance. [0003] With the application of lithium-ion batteries in the field of new energy electric vehicles, the fast charging ability, long life and high temperature stability of batteries are getting more and more attention. Since the use environment of electric vehicles is more harsh than that of 3C and ...

Claims

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Application Information

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IPC IPC(8): H01M10/0567H01M10/0525
CPCH01M10/0567H01M10/0525H01M2300/0025Y02E60/10
Inventor 马国强沈旻李南盛楠蒋志敏宋半夏李中凯
Owner ZHEJIANG RES INST OF CHEM IND CO LTD
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