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High-voltage lithium ion battery electrolyte, additive and preparation method

An electrolyte additive and lithium-ion battery technology, applied in secondary batteries, chemical instruments and methods, secondary battery repair/maintenance, etc., can solve problems such as poor effect and high electrolyte cost, and achieve excellent safety performance and low cost Low, the effect of improving electrochemical performance

Inactive Publication Date: 2019-07-12
JINGMEN GEM NEW MATERIAL +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In view of the above problems, the object of the present invention is to provide a high-voltage lithium-ion battery electrolyte, additives and preparation methods, aiming to solve the technical problems of high cost and poor effect of the existing electrolyte

Method used

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  • High-voltage lithium ion battery electrolyte, additive and preparation method
  • High-voltage lithium ion battery electrolyte, additive and preparation method
  • High-voltage lithium ion battery electrolyte, additive and preparation method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] The structural formula of this additive 1 is as follows:

[0030]

[0031] Prepare the electrolyte using the following method:

[0032] (1.1) In a glove box filled with high-purity argon, fully mix fluoroethylene carbonate, methylethyl fluorocarbonate, and dimethyl fluorocarbonate in a mass ratio of 1:1:1 to obtain a mixture solvent;

[0033] (1.2) According to lithium salt LiPF 6 The concentration is 1mol / L, taking lithium salt into the mixed solvent and fully dispersing to obtain a dispersion solution;

[0034] (1.3) Add the additive with the above structural formula to the dispersion solution according to 0.5wt% by mass, and fully disperse to obtain the electrolyte solution D1 of this embodiment.

Embodiment 2

[0036] The structural formula of this additive 2 is as follows:

[0037]

[0038] Prepare the electrolyte using the following method:

[0039] (2.1) In a glove box filled with high-purity argon, fully mix chloropropylene carbonate, chlorodimethyl carbonate, and chlorodipropyl carbonate solvents according to a mass ratio of 1:0.5:1 to obtain a mixed solvent;

[0040] (2.2) According to lithium salt LiBF 4 The concentration is 0.8mol / L, taking lithium salt into the mixed solvent and fully dispersing to obtain a dispersion solution;

[0041] (2.3) Add the additive with the above structural formula to the dispersion solution according to 0.4wt% by weight, and fully disperse to obtain the electrolyte solution D2 of this embodiment.

Embodiment 3

[0043] The structural formula of this additive 3 is as follows:

[0044]

[0045] Prepare the electrolyte using the following method:

[0046] (3.1) In a glove box filled with high-purity argon, fully mix bromobutylene carbonate, bromodiethyl carbonate, and bromomethyl ethyl carbonate solvents in a mass ratio of 1:2:1 to obtain a mixture solvent;

[0047] (3.2) According to lithium salt LiSO 3 CF 3 The concentration is 0.5mol / L, taking lithium salt into the mixed solvent and fully dispersing to obtain a dispersion solution;

[0048] (3.3) Add the additive with the above structural formula to the dispersion solution at 0.2wt% by mass, and fully disperse to obtain the electrolyte solution D3 of this embodiment.

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Abstract

The invention is applicable to the technical field of lithium ion batteries and provides high-voltage lithium ion battery electrolyte, an additive and a preparation method. The electrolyte additive isketene and has main functional groups of carbon-carbon double bonds, carbonyl and siloxy groups, the additive and electrolyte component materials are mutually reacted to form a layer of a protectionmembrane on the surface of an electrode material, the membrane is capable of alleviating reactions of hydrofluoric acid generated from reactions of a trace amount of water in a battery with lithium hexafluorophosphate, with the electrode material, then the metallic ion dissolution of an electrode can be alleviated, and the coulombic efficiency and the circulation performance of the battery at a high voltage can be improved; on the other hand, an electrochemical stability window of the electrolyte is widened, then the electrolyte is hard to oxidize in the use process, and the security of the battery can be improved.

Description

technical field [0001] The invention belongs to the technical field of lithium-ion batteries, and in particular relates to a high-voltage lithium-ion battery electrolyte, additives and a preparation method. Background technique [0002] There are mainly the following ways to increase the energy density of lithium-ion batteries: 1. Increase the gram capacity of the positive electrode material; 2. Increase the discharge window of the battery. The discharge window of lithium-ion batteries is mainly determined by the electrochemical window of materials and electrolytes. [0003] At present, the discharge cut-off voltage of some materials can reach more than 5V, but the matching electrolyte has not been developed for a long time, so the effective way to increase the discharge window of the battery is to develop an electrolyte that can withstand higher voltage, but The method of increasing the battery discharge window will significantly increase the cost of the electrolyte, and t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07F7/18H01M10/0525H01M10/0566H01M10/0567H01M10/42
CPCC07F7/1804H01M10/0525H01M10/0566H01M10/0567H01M10/4235Y02E60/10
Inventor 许开华周子龙徐世国陈玉君张明龙
Owner JINGMEN GEM NEW MATERIAL
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