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Electrolyte used for 5V high-voltage lithium secondary battery and lithium secondary battery containing same

A lithium secondary battery, electrolyte technology, applied in the direction of secondary battery, secondary battery repair/maintenance, circuit, etc., can solve the problems of high temperature and poor cycle performance, achieve excellent performance, improve high temperature storage performance and cycle performance , the effect of improving cycle performance

Active Publication Date: 2018-04-06
GUANGZHOU TINCI MATERIALS TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Based on this, the purpose of the present invention is to provide an electrolyte solution for a 5V high-voltage lithium secondary battery to solve the problems of high temperature and poor cycle performance of the 5V high-voltage lithium secondary battery

Method used

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  • Electrolyte used for 5V high-voltage lithium secondary battery and lithium secondary battery containing same
  • Electrolyte used for 5V high-voltage lithium secondary battery and lithium secondary battery containing same
  • Electrolyte used for 5V high-voltage lithium secondary battery and lithium secondary battery containing same

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] Battery production:

[0031] Positive electrode preparation: the positive electrode material ratio is: lithium nickel manganese oxide, acetylene black (conductive agent), polyvinylidene fluoride (PVDF, binder) mass ratio is 95:2.5:2.5. Add PVDF to N-methyl-pyrrolidone, stir evenly at high speed, add acetylene black to the solution, stir evenly, then add lithium nickel manganese oxide and stir evenly to form positive electrode slurry, coat positive electrode slurry on aluminum foil, and The positive electrode sheet is baked, compacted, cut, and welded.

[0032] Negative electrode preparation: The ratio of negative electrode materials is silicon-carbon composite material, acetylene black, carboxymethyl cellulose (CMC), and propylene butyl rubber (SBR), with a mass ratio of 95:1.0:1.5:2.5. Add CMC to water, stir at high speed to dissolve completely, then add acetylene black, continue to stir until uniform, continue to add silicon-carbon composite material (Si content is 3...

Embodiment 2

[0036] Adopt the preparation method of embodiment 1 electrolyte to prepare electrolyte A2, the difference is that the additives added are fluoroethylene carbonate, phthalic anhydride, triphenyl phosphite, glyceryl tristearate, and the additions are followed by Accounting for 15.00%, 2.00%, 0.10%, 0.50% of the total mass of the electrolyte, and finally adding lithium hexafluorophosphate accounting for 17.00% of the total mass of the electrolyte to the mixed solution. The remaining components are non-aqueous organic solvents, and the non-aqueous organic solvents are TMS, EC, DMC, and EMC mixed solutions (mass ratio is 1:2:5:3), accounting for 65.40% of the total mass of the electrolyte.

[0037] The lithium secondary battery S2 was prepared according to the method of Example 1 by using the above electrolyte solution. The difference is that the positive electrode material is lithium nickel manganese oxide, and the negative electrode material is graphite material; the rest are the...

Embodiment 3

[0039] The preparation method of the electrolyte in Example 1 is used to prepare the electrolyte A3, except that the additives added are vinylene carbonate, ethylene carbonate, 3-methyl-benzene-1,2,4,5-tetracarboxylic Acid-1,2,4,5-dianhydride, dicyclohexylcarbodiimide, glycerol trioleate, the added amount accounted for 0.50%, 0.50%, 3.00%, 0.10%, 0.50% of the total mass of the electrolyte in sequence , and finally add lithium hexafluorophosphate accounting for 14.40% of the total mass of the electrolyte to the mixed solution. The remaining components are non-aqueous organic solvents, and the non-aqueous organic solvents are TMS, EC, DMC, and EMC mixed solutions (mass ratio is 1:2:5:3), accounting for 81.0% of the total mass of the electrolyte.

[0040] The lithium secondary battery S3 was prepared according to the method of Example 1 by using the above electrolyte solution. The difference is that the positive electrode material is lithium nickel manganese oxide, and the negat...

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Abstract

The invention discloses electrolyte used for a 5V high-voltage lithium secondary battery. The electrolyte contains a cathode film-forming additive, an electrolyte stabilizer, electrolyte lithium saltand a non-water organic solvent. The electrolyte is characterized by also containing an anode film-forming additive and an immersion agent, wherein the anode film-forming additive is prepared from phenyl acid anhydride substances, and the immersion agent is prepared from one or two of glyceryl tristearate and glyceryl trioleate. The invention aims at providing the electrolyte used for the 5V high-voltage lithium secondary battery, and the electrolyte has the advantage that high temperature storage performance and cycle performance of the 5V high-voltage lithium secondary battery can be effectively improved. Meanwhile, the invention also discloses a 5V high-voltage lithium secondary battery adopting the electrolyte.

Description

technical field [0001] The invention relates to the field of electrolytes for lithium secondary batteries, in particular to an electrolyte for a 5V high-voltage lithium secondary battery, a preparation method thereof, and a lithium secondary battery. Background technique [0002] Lithium secondary batteries are widely used because of their high energy density and good cycle performance. 5V high-voltage cathode materials have greater development potential and market prospects because of their higher energy density. For example, in the field of electric vehicle batteries, high-voltage cathode materials mean fewer single cells in series, smaller total battery volume, lighter battery quality and higher energy. [0003] However, the existing 5V high-voltage cathode material lithium secondary battery has the following problems: high temperature performance and cycle performance are poor. [0004] At present, there have been some studies on solving the problems of 5V high-voltage...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/0567H01M10/42
CPCH01M10/0567H01M10/4235Y02E60/10
Inventor 王海范伟贞周邵云余乐谢添
Owner GUANGZHOU TINCI MATERIALS TECH
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