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Electrolyte, lithium ion battery and preparation method and application of lithium ion battery

An electrolyte and lithium salt technology, applied in secondary batteries, organic electrolytes, non-aqueous electrolytes, etc., can solve the problems of thermal stability, safety and better cycle performance, and achieve excellent cycle stability and low surface tension. , good wettability

Pending Publication Date: 2021-08-24
SHANGHAI ELECTRICGROUP CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The problem to be solved by the present invention is to overcome the defects that the electrolyte in the prior art is used in lithium-ion batteries, which cannot simultaneously achieve better thermal stability, safety and cycle performance, and provide an electrolyte, lithium-ion battery And its preparation method and application

Method used

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  • Electrolyte, lithium ion battery and preparation method and application of lithium ion battery
  • Electrolyte, lithium ion battery and preparation method and application of lithium ion battery
  • Electrolyte, lithium ion battery and preparation method and application of lithium ion battery

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Embodiment 1

[0063] The preparation of embodiment 1 electrolyte

[0064] In the glove box, weigh ethylene carbonate (EC), ethyl methyl carbonate (EMC), dimethyl carbonate (DMC), and fluoroethylene carbonate (FEC) in a mass ratio of 27:35:27:10 Mixing to obtain a mixed organic solvent;

[0065] Add the first additive of 4% propane sultone (PS) and 3% adiponitrile (ADN), the percentage is the mass percentage of PS or ADN in the electrolyte solution; mix well;

[0066] Then add 1.15mol / L lithium hexafluorophosphate (LiPF 6 ), to obtain a mixed solution;

[0067] Stir to dissolve the mixed solution completely to obtain an electrolyte solution.

Embodiment 2

[0068] The preparation of embodiment 2 electrolyte

[0069] In the glove box, weigh ethylene carbonate (EC), ethyl methyl carbonate (EMC), dimethyl carbonate (DMC), and fluoroethylene carbonate (FEC) in a mass ratio of 27:35:27:10 Mixing to obtain a mixed organic solvent;

[0070] Add the first additive of 4% propane sultone (PS) and 3% adiponitrile (ADN), the percentage is the mass percentage of PS or ADN in the electrolyte solution; mix well;

[0071] Then add lithium hexafluorophosphate (LiPF 6 ) and lithium bistrifluorosulfonyl imide (LiTFSI) to obtain a mixed solution; among them, LiPF 6 The concentration of LiTFSI is 0.575mol / L; the concentration of LiTFSI is 0.575mol / L; that is, the concentration of lithium salt is 1.15mol / L;

[0072] Stir to dissolve the mixed solution completely to obtain an electrolyte solution.

Embodiment 3

[0073] The preparation of embodiment 3 electrolyte

[0074] In the glove box, respectively take ethylene carbonate (EC), ethyl methyl carbonate (EMC), dimethyl carbonate (DMC) and mix in a volume ratio of 1:1:1 to obtain a mixed organic solvent;

[0075] Add the first additive of 1% propane sultone (PS) and 5% fluoroethylene carbonate (FEC), the percentage is that PS or FEC accounts for the mass percent of electrolytic solution; And add 5% trimethyl phosphate (TMP) The second additive, the percentage is the mass percent that TMP accounts for electrolyte; Fully mix;

[0076] Then add lithium hexafluorophosphate (LiPF 6 ) and lithium bistrifluorosulfonyl imide (LiTFSI) to obtain a mixed solution; among them, LiPF 6 The concentration of LiTFSI is 0.575mol / L; the concentration of LiTFSI is 0.575mol / L; that is, the concentration of lithium salt is 1.15mol / L;

[0077] Stir to dissolve the mixed solution completely to obtain an electrolyte solution.

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Abstract

The invention discloses an electrolyte, a lithium ion battery and a preparation method and application of the lithium ion battery. The electrolyte comprises a lithium salt, an organic solvent and a first additive, wherein the lithium salt comprises lithium hexafluorophosphate; the concentration of the lithium hexafluorophosphate is 0.8 to 1.5 mol / L; the first additive comprises propane sultone and a substance m; and the substance m is one or more of vinylene carbonate, adiponitrile, fluoroethylene carbonate and 1, 1, 1, 3, 3, 3-hexafluoroisopropyl methyl ether. The electrolyte disclosed by the invention is high in flash point, high in ionic conductivity, relatively good in thermal stability and safety and incombustible; when the electrolyte is applied to the lithium ion battery, the thermal stability, the safety and the cycle performance of the lithium ion battery are obviously improved; and meanwhile, the preparation methods of the electrolyte and the lithium ion battery are simple and can be used for industrial production.

Description

technical field [0001] The invention relates to an electrolytic solution, a lithium ion battery and a preparation method and application thereof. Background technique [0002] Due to its high energy density, working voltage, long cycle life and environmental friendliness, lithium-ion batteries have been widely used in the market of ultra-portable electronic products, such as mobile phones, tablet computers, notebook computers, smart watches, etc., and have become the mainstay of modern technology. key support. In addition, lithium-ion batteries have great development potential in applications of different capacity levels such as home energy storage, grid energy storage, and power batteries for electric vehicles. [0003] However, with the rapid development of lithium-ion batteries, some problems have gradually emerged in terms of safety performance. The main component of the current commercial electrolyte is a linear carbonate solvent, such as lithium hexafluorophosphate (...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/0567H01M10/0568H01M10/42H01M10/0525
CPCH01M10/0567H01M10/0568H01M10/4235H01M10/0525H01M2300/0025Y02E60/10
Inventor 廖文俊耿振王雷丹阳周兰汤剑涛
Owner SHANGHAI ELECTRICGROUP CORP
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