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A kind of fluorinated alkylsulfonimide additive for promoting the film formation of graphite carbon negative electrode and electrolyte solution containing the additive

A fluoroalkylsulfonimide, negative electrode film forming technology, applied in circuits, electrical components, secondary batteries, etc., can solve problems such as deterioration, unstable VC, high price, etc., to reduce consumption and prevent co-embedding , the effect of improving safety performance

Active Publication Date: 2020-07-03
SOUTH CHINA NORMAL UNIVERSITY +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

VC, as a commonly used negative electrode film-forming additive for lithium-ion batteries, can better improve the cycle performance of graphite carbon electrodes, but VC is unstable and prone to polymerization and deterioration, and the price is relatively expensive

Method used

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  • A kind of fluorinated alkylsulfonimide additive for promoting the film formation of graphite carbon negative electrode and electrolyte solution containing the additive
  • A kind of fluorinated alkylsulfonimide additive for promoting the film formation of graphite carbon negative electrode and electrolyte solution containing the additive
  • A kind of fluorinated alkylsulfonimide additive for promoting the film formation of graphite carbon negative electrode and electrolyte solution containing the additive

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] In a glove box filled with argon, ethylene carbonate (EC), dimethyl carbonate (DMC) and ethyl methyl carbonate (EMC) were mixed in a weight ratio of EC:DMC:EMC=1:1:1, solvent The mass percentage is 87%, using lithium hexafluorophosphate as lithium salt, its concentration is 1mol / L (mass fraction is 12.5%), and the film-forming additive N-phenylbis(trifluoromethanesulfonyl) of 0.5wt.% is added thereto ) imine (PhTFSI), mixed uniformly to obtain the electrolyte solution of Example 1.

Embodiment 2

[0023] The electrolyte preparation method refers to Example 1, the difference is that 1.0 wt% of film-forming additive N-phenylbis(trifluoromethanesulfonyl)imide (PhTFSI) is added to the electrolyte.

Embodiment 3

[0025] The electrolyte solution preparation method refers to Example 1, the difference is that 0.5 wt% film-forming additive bis(trifluoromethanesulfonyl)imide (HTFSI) is added to the electrolyte solution.

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Abstract

The invention discloses a fluoroalkylsulfonylimide lithium-ion battery electrolyte additive whose structural formula is shown in formula I to promote the film formation of graphite carbon negative electrode: wherein, R 1 is hydrogen, benzene ring, five-membered or six-membered heterocyclic group selected from furan, thiophene, pyrrole, thiazole, imidazole, pyridine, pyrazine, pyrimidine, pyridazine , R 2 and R 3 It is a F atom or a fluoroalkyl group in which 1 to 3 hydrogen atoms in a methyl group, an ethyl group, or a propyl group are replaced by F. The SEI film formed by the fluoroalkylsulfonimide additive is better than the SEI film formed by VC, which can better improve the cycle stability of the graphite carbon negative electrode, improve the safety performance of the lithium-ion battery, and show good performance. Practicality and economic value.

Description

Technical field: [0001] The invention relates to the field of lithium-ion battery electrolytes, in particular to a fluoroalkylsulfonimide additive for promoting the film formation of a graphite carbon negative electrode and an electrolyte containing the additive. Background technique: [0002] Lithium-ion batteries (LIBs) have become the main power source of consumer electronics due to their high energy density and long cycle life, and also show promising applications in fields such as electric vehicles, power tools, and energy storage. Graphite carbon materials are currently the most commonly used anode materials for commercial lithium-ion batteries, with stable cycle performance and high safety performance. Lithium deposition in graphitic carbon materials usually cannot be completely avoided under low electrochemical potential conditions. In particular, obvious lithium dendrites are generated on the surface of graphitic carbon materials under high current density charging...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M10/0567H01M10/0568H01M10/42H01M10/0525
CPCH01M10/0525H01M10/0567H01M10/0568H01M10/4235Y02E60/10
Inventor 南俊民杨天翔马振左晓希
Owner SOUTH CHINA NORMAL UNIVERSITY
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