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Lithium-ion battery electrolyte and lithium-ion battery

A lithium-ion battery and electrolyte technology, applied in the field of electrochemistry, achieves the effects of high safety, improved cycle life, and suppressed swelling

Active Publication Date: 2015-03-11
ZHANGJIAGANG GUOTAI HUARONG NEW CHEM MATERIALS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] However, there is currently no lithium-ion full battery that can take into account the high-voltage cycle and safety performance above 4.85V.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0051] The organic solvent is ethylene carbonate, 3-fluorophenylmethyl sulfone, and ethyl methyl carbonate (the mass ratio of the three is 30:30:40); the lithium salt is LiPF 6 , and the concentration of lithium salt is 1mol / L, the film-forming additives are vinylene carbonate and 1,3-propane sultone, respectively accounting for 1% of the total mass of the electrolyte, and the anti-overcharge additive is cyclohexylbenzene, accounting for 0.1% of the total mass of the electrolyte, and the positive electrode protection additive is N,N-dicyclohexylcarbodiimide, accounting for 0.2% of the total mass of the electrolyte.

Embodiment 2

[0053] The organic solvent is ethylene carbonate, 3-fluorophenylmethyl sulfone, dimethyl sulfoxide, and ethyl methyl carbonate (the mass ratio of the four is 30:20:10:40); the lithium salt is LiPF 6 , and the concentration of lithium salt is 1mol / L, the film-forming additives are vinylene carbonate and 1,3-propane sultone, respectively accounting for 1% of the total mass of the electrolyte, and the anti-overcharge additive is cyclohexylbenzene, accounting for 0.1% of the total mass of the electrolyte, and the positive electrode protection additive is N,N-dicyclohexylcarbodiimide, accounting for 0.2% of the total mass of the electrolyte.

Embodiment 3

[0055] The organic solvent is ethylene carbonate, 3-fluorophenylmethyl sulfone, tetramethyl sulfoxide, and ethyl methyl carbonate (the mass ratio of the four is 30:20:10:40); the lithium salt is LiPF 6 , and the concentration of lithium salt is 1mol / L, the film-forming additives are vinylene carbonate and 1,3-propane sultone, which account for 1% of the total mass of the electrolyte, and the anti-overcharge additive is biphenyl, which accounts for 1% of the total mass of the electrolyte. 0.1% of the total mass of the electrolyte, and the anode protection additive is N,N-dicyclohexylcarbodiimide, which accounts for 0.2% of the total mass of the electrolyte.

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PUM

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Abstract

The invention relates to a lithium-ion battery electrolyte and a lithium-ion battery. The lithium-ion battery electrolyte includes lithium salt, an organic solvent and additives, wherein the organic solvent is a mixed solvent of sulfones and / or sulfoxides and other organic solvents; the mass ratio of sulfones and / or sulfoxides to other organic solvents ranges from 0.1 to 1:1; the additives include a film-forming additive, an overcharge protection additive and an anode protection additive. The lithium-ion battery electrolyte provided by the invention can greatly prolong the cycle life of the lithium-ion battery at a high voltage of over 4.85 V and can suppress battery bulging. The lithium-ion battery using the lithium-ion battery electrolyte provided by the invention does not explode or fire when being stabbed in a fully-charged state and is highly safe.

Description

technical field [0001] The invention belongs to the technical field of electrochemistry, and in particular relates to an electrolyte of a lithium-ion battery with a working voltage above 4.85V and the lithium-ion battery. Background technique [0002] In recent years, lithium-ion batteries have gradually replaced traditional batteries such as lead-acid, nickel-cadmium, and nickel-metal hydride due to their high energy density, long cycle life, and environmental friendliness. However, with the development of portable electronic products in the direction of miniaturization and multi-function, the energy density requirements of lithium-ion batteries are getting higher and higher, and increasing the working voltage of lithium-ion batteries is one of the most effective ways to increase their energy density. The currently commonly used carbonate solvents have a narrow electrochemical window and are easy to decompose under high voltage. At the same time, the reaction between the po...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/0569H01M10/0525
CPCH01M10/0525H01M10/0567H01M10/0569H01M2300/0037Y02E60/10
Inventor 陈黎甘朝伦袁翔云舒亚飞方剑慧赵世勇
Owner ZHANGJIAGANG GUOTAI HUARONG NEW CHEM MATERIALS CO LTD
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