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Non-aqueous electrolyte and lithium ion battery containing the non-aqueous electrolyte

A non-aqueous electrolyte, lithium ion battery technology, applied in the field of batteries, can solve problems such as hindering lithium ion migration, affecting battery life, damaging passivation films, etc., to improve internal dynamic characteristics, improve cycle performance and high temperature performance , the effect of reducing dissolution

Pending Publication Date: 2021-12-21
ZHUHAI COSMX BATTERY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, there will be certain defects in the positive electrode material under high voltage. For example, the high-voltage positive electrode active material has a strong oxidation property in the lithium-deficient state, which makes the electrolyte easy to be oxidized and decomposed, and produces a large amount of gas; in addition, the high-voltage positive electrode The active material itself is also very unstable in the state of lithium deficiency, and some side reactions are prone to occur, such as the release of oxygen, the dissolution of transition metal ions, etc., causing the transition metal ions to break away from the crystal and enter the electrolyte as the reaction progresses to catalyze the decomposition and dissolution of the electrolyte. Damage the passivation film of the active material, and transition metal lithium ions will also occupy the lithium ion migration channel of the passive film on the surface of the negative electrode material, hindering the migration of lithium ions, thereby affecting the service life of the battery. This negative effect will be more pronounced when used under

Method used

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  • Non-aqueous electrolyte and lithium ion battery containing the non-aqueous electrolyte
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  • Non-aqueous electrolyte and lithium ion battery containing the non-aqueous electrolyte

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Embodiment 1

[0042] The present embodiment provides a kind of non-aqueous electrolytic solution, and described non-aqueous electrolytic solution comprises as follows:

[0043] An additive consisting of additive A of formula I-1 and additive B of formula II-1;

[0044] Solvents, including cyclic carbonates and chain carbonates, wherein the cyclic carbonates are ethylene carbonate, and the chain carbonates are dimethyl carbonate;

[0045] Lithium salt is LiPF 6 ;

[0046] Wherein, the mass ratio of the cyclic carbonate and the chain carbonate is 1:2.5; the molar concentration of the lithium salt in the mixed solvent formed by the cyclic carbonate and the chain carbonate is 1.2mol / L; The quality of said additive A is 0.3% of the total mass of lithium salt, cyclic carbonate and chain carbonate; the quality of said additive B is 1.2% of the total mass of lithium salt, cyclic carbonate and chain carbonate .

[0047] Preparation method: Stir and mix the above-mentioned cyclic carbonate, chain...

Embodiment 2

[0049] The non-aqueous electrolytic solution of the present embodiment, with embodiment 1, difference is:

[0050] The additive A is the additive A of formula I-2; the cyclic carbonate is gamma-butyrolactone, and the chain carbonate is ethyl methyl carbonate;

[0051] The mass ratio of the cyclic carbonate to the chain carbonate is 1:2.

[0052] The preparation method of the non-aqueous electrolyte of this embodiment is the same as that of Embodiment 1.

Embodiment 3

[0054] The non-aqueous electrolytic solution of the present embodiment, with embodiment 1, difference is:

[0055] The additive A is the additive A of formula I-3; The cyclic carbonate is propylene carbonate, and the chain carbonate is diethyl carbonate;

[0056] The mass ratio of the cyclic carbonate to the chain carbonate is 1:3.

[0057] The preparation method of the non-aqueous electrolyte of this embodiment is the same as that of Embodiment 1.

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Abstract

The invention provides a non-aqueous electrolyte and a lithium ion battery containing the non-aqueous electrolyte. The non-aqueous electrolyte comprises a solvent, a lithium salt, an additive A and an additive B, wherein the additive A is an organic silicon nitrile compound, and the additive B is an oxazolone compound. Through the combined action of the additive A organic silicon nitrile compound and the additive B oxazolone compound, the cycle performance, the high-temperature storage performance and the low-temperature performance of the high-voltage lithium ion battery, especially the ternary high-voltage lithium ion battery, are effectively improved.

Description

technical field [0001] The invention belongs to the technical field of batteries, and relates to a nonaqueous electrolytic solution, a preparation method thereof and a lithium ion battery. Background technique [0002] Compared with commercial lithium cobalt oxide cathode materials, ternary materials have higher theoretical and actual gram capacities, and are becoming more and more popular in practical applications. In order to increase the energy density of lithium-ion batteries, a common measure is to increase the charging medium voltage of the positive electrode material, such as the commercial ternary material battery voltage from 4.2V→4.35V→4.4V→4.6V. However, there will be certain defects in the positive electrode material under high voltage. For example, the high-voltage positive electrode active material has a strong oxidation property in the lithium-deficient state, which makes the electrolyte easy to be oxidized and decomposed, and produces a large amount of gas; i...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/0567H01M10/0525
CPCH01M10/0567H01M10/0525H01M2300/0025Y02E60/10
Inventor 王海曾长安李素丽李俊义徐延铭
Owner ZHUHAI COSMX BATTERY CO LTD
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