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Non-aqueous electrolyte and lithium ion battery containing same

A non-aqueous electrolyte and lithium-ion battery technology, applied in secondary batteries, secondary battery repair/maintenance, circuits, etc., can solve the problems of unsatisfactory high and low temperature performance of additives, achieve good performance, long cycle life, high The effect of conducting lithium ion

Inactive Publication Date: 2019-05-28
ZHUHAI COSMX BATTERY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The object of the present invention is to solve the problem of unsatisfactory high and low temperature performance of existing electrolyte additives, and provide a non-aqueous electrolyte and a lithium-ion battery containing the non-aqueous electrolyte. The electrolyte can be formed on the surface of the positive and negative electrodes. The interfacial film with high lithium ion conductivity and high stability makes the battery have a long cycle life at high temperature and good performance at low temperature

Method used

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  • Non-aqueous electrolyte and lithium ion battery containing same
  • Non-aqueous electrolyte and lithium ion battery containing same
  • Non-aqueous electrolyte and lithium ion battery containing same

Examples

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Embodiment 1

[0018] A kind of nonaqueous electrolytic solution, is made of nonaqueous organic solvent, conductive lithium salt and additive, and described nonaqueous organic solvent accounts for 84.9% of nonaqueous electrolytic solution gross mass, is made of cyclic solvent (ethylene carbonate) and linear solvent ( ethyl methyl carbonate) composition, the mass ratio of ethylene carbonate and ethyl methyl carbonate is 1:2. The conductive lithium salt is lithium hexafluorophosphate, which accounts for 10% of the total mass of the non-aqueous electrolyte. The additives were 0.1% lithium divinylbis(malonate)phosphate and 5% methylene methanedisulfonate. The electrolyte solution of this embodiment is used for LiNi 0.6 co 0.2 mn 0.2 o 2 / graphite pouch battery.

Embodiment 2

[0020] In the non-aqueous electrolytic solution of this embodiment, the non-aqueous organic solvent accounts for 72.9% of the total mass of the non-aqueous electrolytic solution, consisting of a cyclic solvent (ethylene carbonate) and a linear solvent (ethyl methyl carbonate), ethylene carbonate and carbonic acid The mass ratio of methyl ethyl ester is 1:2. The conductive lithium salt is lithium hexafluorophosphate, which accounts for 25% of the total mass of the non-aqueous electrolyte. The electrolyte additive is 2% lithium diphenylbis(malonate) phosphate and 0.1% 1,4-butane sultone. The electrolyte solution of this embodiment is used for LiNi 0.5 co 0.2 mn 0.3 o 2 / graphite pouch battery.

Embodiment 3

[0022] In the non-aqueous electrolytic solution of the present embodiment, the non-aqueous organic solvent accounts for 80% of the total mass of the non-aqueous electrolytic solution, and consists of a cyclic solvent (ethylene carbonate) and a linear solvent (ethyl methyl carbonate, dimethyl carbonate) , the mass ratio of ethylene carbonate, ethyl methyl carbonate and dimethyl carbonate is 1:1:1. Lithium hexafluorophosphate accounts for 15% of the total mass of the non-aqueous electrolyte. The electrolyte additives are 0.5% lithium difluorobis(malonate)phosphate, 0.5% lithium difluorobis(4-fluoromalonate)phosphate, and 4% ethylene sultone. The electrolyte solution of this embodiment is used for LiNi 0.8 co 0.15 Al 0.05 o 2 / graphite pouch battery.

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Abstract

The invention discloses a non-aqueous electrolyte and a lithium ion battery containing the non-aqueous electrolyte, and belongs to the technical field of lithium ion batteries. The non-aqueous electrolyte comprises a non-aqueous organic solvent, a conductive lithium salt and an additive. The additive includes at least one phosphate type lithium salt compound and at least one S=O-containing compound, wherein the phosphate type lithium salt compound is divinyl bis(malonic acid) lithium phosphate, diphenyl bis(malonic acid) lithium phosphate and difluoro bis(malonic acid) lithium phosphate. The S=O-containing compound is methylene methanedisulfonate, ethylene sulfate, propylene sulfate, 1,3-propane sultone, 1,4-butyl sultone, ethylene sultone and 1,3-propylene sultone or 1,4-butylene sultone.The preparation method has the advantages that through the synergistic effect of the phosphate lithium salt compound and the S=O-containing compound, a stable interface film with low impedance is formed, and the interface film has relatively good high-temperature cycling stability and low-temperature characteristic.

Description

technical field [0001] The invention belongs to the technical field of lithium ion batteries, and in particular relates to a nonaqueous electrolytic solution and a lithium ion battery containing the nonaqueous electrolytic solution. Background technique [0002] In recent years, lithium-ion batteries have been widely used as energy storage devices in electronic devices such as smartphones, tablet computers, and Bluetooth headsets. However, with the diversification and diversification of functions of electronic devices, consumers have higher and higher requirements for the battery life of electronic devices. Therefore, improving the energy density of lithium-ion batteries is a current research hotspot. [0003] The improvement of energy density, on the one hand, is to obtain higher capacity by increasing the charging voltage of the battery; on the other hand, it is to use high-capacity positive or negative electrode materials. Unfortunately, whether it is the increase of ba...

Claims

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Application Information

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IPC IPC(8): H01M10/0567H01M10/42H01M10/0525
CPCH01M10/0525H01M10/0567H01M10/42Y02E60/10
Inventor 廖波李素丽王海徐延铭李俊义
Owner ZHUHAI COSMX BATTERY CO LTD
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