High-voltage lithium ion battery non-aqueous electrolyte and high-voltage lithium ion battery

A lithium-ion battery, non-aqueous electrolyte technology, applied in secondary batteries, secondary battery repair/maintenance, circuits, etc., can solve problems such as dissolution, improve high and low temperature performance, strong oxidation resistance, and good stability Effect

Inactive Publication Date: 2020-05-08
DONGGUAN SHANSHAN BATTERY MATERIALS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The electrolyte additive of the present invention has good positive electrode film-forming performance, can effectively solve the problem of positive metal ion dissolution, and improve the normal temperature cycle performance, high temperature cycle performance and high temperature storage performance of high-voltage lithium ion batteries

Method used

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  • High-voltage lithium ion battery non-aqueous electrolyte and high-voltage lithium ion battery

Examples

Experimental program
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Effect test

Embodiment 1

[0041] Electrolyte preparation: The preparation of electrolyte was carried out in a glove box filled with argon (H 2 O2 6 ) and lithium difluorophosphate (LiPO 2 f 2 ), then add sulfur compound 1, finally add negative electrode film-forming additives fluoroethylene carbonate (FEC), 1.3-propane sultone (PS), positive electrode protection additive succinonitrile (SN), stir After uniformity, the lithium ion battery electrolyte of Example 1 was obtained. Wherein, the mass percent of lithium hexafluorophosphate in the electrolyte is 14%, the mass percent of lithium difluorophosphate in the electrolyte is 1.0%, the mass percent of Compound 1 in the electrolyte is 0.5%, and the 1,3-propanesulfonic acid The mass percentage of ester (PS) in the electrolyte is 3.0%, the mass percentage of fluoroethylene carbonate (FEC) in the electrolyte is 5.0%, and the mass percentage of succinonitrile (SN) in the electrolyte is 2.0%. . The electrolyte formulation is shown in Table 1.

Embodiment 2-8

[0043] Examples 2-8 are also specific examples of electrolyte preparation. Except for the parameters in Table 1, other parameters and preparation methods are the same as in Example 1. The electrolyte formulation is shown in Table 1.

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Abstract

The invention discloses a high-voltage lithium ion battery non-aqueous electrolyte. The high-voltage lithium ion battery non-aqueous electrolyte comprises an electrolyte lithium salt, a non-aqueous organic solvent and additives, and the additives comprise the following components in percentage by mass in the high-voltage lithium ion battery non-aqueous electrolyte: 0.5-1.0% of a sulfur compound, 0.5-3.0% of a positive electrode protection additive and 0.1-8.0% of a negative electrode film-forming additive. The invention also discloses a high-voltage lithium ion battery. The high-voltage lithium ion battery non-aqueous electrolyte can effectively inhibit dissolution of metal ions, reduce decomposition and gas production of the electrolyte, improve the cycle performance of the battery underhigh voltage, reduce the impedance of the battery and improve the low-temperature performance of the lithium ion battery.

Description

technical field [0001] The invention relates to the technical field of lithium ion batteries, in particular to a high-voltage lithium-ion battery non-aqueous electrolyte and a high-voltage lithium-ion battery. Background technique [0002] Lithium-ion batteries are widely used in digital 3C products such as mobile phones, cameras and notebook computers due to their advantages such as light weight, small size, high energy density, long cycle life, high output power and low environmental pollution. However, with the development of science and technology, people have higher energy density requirements for lithium-ion batteries, and increasing the working voltage of lithium-ion batteries is one of the effective means to increase energy density. [0003] However, as the voltage of the lithium-ion battery increases, the oxidative decomposition reaction of the electrolyte intensifies, a large amount of gas is generated, and the internal pressure of the battery increases, which lead...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/0567H01M10/0525H01M10/42
CPCH01M10/0525H01M10/0567H01M10/4235Y02E60/10
Inventor 钟婷婷朱学全郭力黄慧聪潘立宁
Owner DONGGUAN SHANSHAN BATTERY MATERIALS
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