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Lithium ion battery electrolyte and lithium ion battery

A lithium-ion battery and electrolyte technology, applied in the field of electrochemistry, can solve the problems of poor cycle performance and poor solubility of silicon negative batteries, and achieve the effect of improving normal temperature cycle performance, high temperature performance, and compact toughness

Pending Publication Date: 2022-03-11
宁德国泰华荣新材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But LiNO 3 The solubility in carbonate is not good, and the addition of LiNO 3 The electrolyte is not very good for improving the cycle performance of silicon negative batteries

Method used

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  • Lithium ion battery electrolyte and lithium ion battery
  • Lithium ion battery electrolyte and lithium ion battery
  • Lithium ion battery electrolyte and lithium ion battery

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Embodiment Construction

[0023] The present invention will be further described below in conjunction with embodiment. However, the present invention is not limited to the following examples. The implementation conditions adopted in the examples can be further adjusted according to the different requirements of specific use, and the implementation conditions not indicated are the conventional conditions in this industry. The technical features involved in the various embodiments of the present invention may be combined with each other as long as they do not constitute conflicts with each other.

[0024] Electrolyte preparation:

[0025] Mix ethylene carbonate, diethyl carbonate and ethyl methyl carbonate uniformly at a volume ratio of 1:1:1, see Table 1 and Table 2 for other components and dosages in the electrolyte.

[0026] Preparation of battery:

[0027] The negative electrode is made of silicon carbon material, and the positive electrode is made of 4.2V NCM523 material. The electrolyte, positiv...

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Abstract

The invention discloses a lithium ion battery electrolyte and a lithium ion battery. The electrolyte comprises an organic solvent, a lithium salt and an additive, the organic solvent comprises fluoroethylene carbonate, the lithium salt comprises LiPF6 and LiNO3 with the concentration of 1.3 mol / L or above, and the lithium salt further comprises at least one of boron-containing lithium salt or fluorophosphite. The lithium ion battery provided by the invention has good charging and discharging normal-temperature and high-temperature cycle performance.

Description

technical field [0001] The invention belongs to the technical field of electrochemistry, and in particular relates to a lithium battery electrolyte and a lithium ion battery. Background technique [0002] Silicon material is used as the negative electrode of lithium-ion batteries. During the charge-discharge cycle of the battery, the reversible formation and decomposition of Li-Si alloy is accompanied by a huge volume change, which will cause powdering or cracking of the alloy, resulting in the collapse and collapse of the silicon material structure. The peeling of the electrode material causes the electrode material to lose electrical contact, resulting in a sharp decline in the cycle performance of the silicon negative lithium-ion battery. At the same time, due to the occurrence of side reactions, a large amount of gas will be generated during the charging and discharging process, which will easily lead to flatulence inside the battery. [0003] LiNO 3 A layer of solid e...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/0567H01M10/0568H01M10/0525
CPCH01M10/0567H01M10/0568H01M10/0525H01M2300/0025Y02E60/10
Inventor 袁杰李云飞甘朝伦陈明凯戴建才赵世勇
Owner 宁德国泰华荣新材料有限公司