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Electrolyte and lithium ion battery

A technology of electrolyte and electrolyte additive, which is applied in secondary batteries, secondary battery repair/maintenance, circuits, etc., and can solve the problems that lithium-ion batteries are difficult to have both high energy density rate discharge performance and high temperature resistance performance

Active Publication Date: 2019-06-25
FARASIS TECH (GANZHOU) CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The object of the present invention is to provide a lithium-ion battery capable of obtaining high energy density, cycle performance, rate discharge performance and high temperature resistance for existing lithium-ion batteries. Electrolyte and lithium-ion battery of lithium-ion battery with discharge performance and high temperature resistance

Method used

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  • Electrolyte and lithium ion battery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0056] This example is used to illustrate the electrolyte solution of the present invention.

[0057] LiPF 6 , LiODFB and LiBOB were dissolved in a mixed solvent of ethylene carbonate EC, diethyl carbonate DEC, ethyl methyl carbonate EMC and propylene carbonate PC (volume ratio EC:DEC:EMC:PC=20:35:20:3) , the solution obtained; then add electrolyte additives: film-forming agent VC and film-forming agent PS, and additive A (ie 1,3-propane sultone) mixed uniformly to obtain electrolyte A1, in electrolyte A1, LiPF 6 The concentration of LiODFB is 1mol / L, the concentration of LiODFB is 0.01mol / L, the concentration of LiBOB is 0.03mol / L, the content of film-forming agent VC is 1.5% by weight, the content of film-former PS is 1.5% by weight, the content of additive A The content is 0.5% by weight.

Embodiment 2

[0059] This example is used to illustrate the electrolyte solution of the present invention.

[0060] LiPF 6 , LiODFB and LiBOB were dissolved in a mixed solvent of ethylene carbonate EC, diethyl carbonate DEC, ethyl methyl carbonate EMC and propylene carbonate PC (volume ratio EC:DEC:EMC:PC=20:35:20:3) , the resulting solution; then add electrolyte additives: film-forming agent VC and film-forming agent PS, and additive A (ie, 1,4-butane sultone), mix well to obtain electrolyte A2, in electrolyte A2 , LiPF 6 The concentration of LiODFB is 1mol / L, the concentration of LiODFB is 0.02mol / L, the concentration of LiBOB is 0.03mol / L, the content of film-forming agent VC is 2% by weight, the content of film-former PS is 2% by weight, the content of additive A The content is 1% by weight.

Embodiment 3

[0062] This example is used to illustrate the electrolyte solution of the present invention.

[0063] LiPF 6 , LiODFB and LiBOB were dissolved in a mixed solvent of ethylene carbonate EC, diethyl carbonate DEC, ethyl methyl carbonate EMC and propylene carbonate PC (volume ratio EC:DEC:EMC:PC=20:35:20:3) , the solution obtained; then add electrolyte additives: film-forming agent VC and film-forming agent PS, and additive A (i.e. 1,3-propane sultone), mix uniformly to obtain electrolyte A3, in electrolyte A3, LiPF 6 The concentration of LiODFB is 1mol / L, the concentration of LiODFB is 0.03mol / L, the concentration of LiBOB is 0.05mol / L, the content of film-forming agent VC is 2% by weight, the content of film-former PS is 3% by weight, the content of additive A The content is 1.5% by weight.

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Abstract

The invention relates to the field of lithium ion batteries, in particular to an electrolyte and a lithium ion battery. The electrolyte contains an electrolyte lithium salt, a non-aqueous solvent andan electrolyte additive. The electrolyte lithium salt is a combination of a first lithium salt and a second lithium salt, wherein the first lithium salt is LiPF6, and the second lithium salt is one ormore of lithium difluoro(oxalato) borate, Lithium bis(oxalate)borate and lithium difluorophosphate. The electrolyte additive includes a film forming agent and an additive A, and the additive A is oneor more of alkyl sultone, alkenyl sultone and sulfurous dialkyl ester. The components of the electrolyte of the invention can cooperate to complete the charging and discharging process and maintain the stabilization effect of LiPF6. The electrolyte can be used to prepare a lithium ion battery with high energy density, high cycle performance, high rate discharge performance and high resistance tohigh temperature.

Description

technical field [0001] The invention relates to the field of lithium ion batteries, in particular to an electrolyte and a lithium ion battery. Background technique [0002] With the increasing development of electric vehicles, higher requirements are placed on batteries with high energy density that can provide greater cruising range. Existing lithium-ion batteries include a positive electrode made of ternary materials and a negative electrode made of graphite. If the amount of active material coating on the positive and negative plates is increased and the conductive agent carbon black is used, although the battery cell can obtain a higher energy density, However, the cycle performance and rate discharge performance are poor, which cannot meet the requirements of EV power batteries. At the same time, due to the continuous heat release of the battery during use, the temperature inside the battery pack rises, making the temperature inside the battery pack reach 50°C or even ...

Claims

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Application Information

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IPC IPC(8): H01M10/0567H01M10/0568H01M10/0525H01M10/42
CPCY02E60/10
Inventor 谭军P·廖J·W·江熊伟
Owner FARASIS TECH (GANZHOU) CO LTD