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Non-aqueous electrolyte and lithium ion battery

A non-aqueous electrolyte and non-aqueous solvent technology, which is applied in the direction of non-aqueous electrolyte battery, electrolyte battery manufacturing, electrolyte, etc., can solve problems that need to be improved, improve kinetic performance, improve electrochemical performance, and overcome poor oxidation resistance Effect

Inactive Publication Date: 2020-04-07
CONTEMPORARY AMPEREX TECH CO
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, there are still many deficiencies in the above-mentioned non-aqueous electrolyte. For example, in a high-voltage system, the cycle performance, storage performance and safety performance of the above-mentioned non-aqueous electrolyte need to be improved. Safety performance such as overcharge safety and hot box safety of ion batteries also needs to be improved

Method used

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  • Non-aqueous electrolyte and lithium ion battery
  • Non-aqueous electrolyte and lithium ion battery
  • Non-aqueous electrolyte and lithium ion battery

Examples

Experimental program
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Effect test

Embodiment 1

[0065] (1) Preparation of non-aqueous electrolyte

[0066] Mix compound A1 and ethyl methyl carbonate (EMC) in a weight ratio of 30:70 as a non-aqueous solvent, and then dissolve 1mol / L LiPF 6As a lithium salt, 0.1% FEC is then added to configure a non-aqueous electrolyte.

[0067] (2) Preparation of positive pole piece

[0068] The cathode active material LiNi 0.8 co 0.1 mn 0.1 o 2 , the conductive agent acetylene black, and the binder polyvinylidene fluoride (PVDF) at a weight ratio of 94:3:3 are fully stirred and mixed in the N-methylpyrrolidone solvent system, and then coated on the current collector Al foil and dried. Cold pressing to obtain the positive electrode sheet.

[0069] (3) Preparation of negative pole piece

[0070] Negative electrode active material artificial graphite, conductive agent acetylene black, binder styrene-butadiene rubber, thickener sodium carboxymethyl cellulose in a weight ratio of 95:2:2:1 are fully stirred and mixed in a deionized water...

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Abstract

The invention provides a non-aqueous electrolyte and a lithium ion battery. The non-aqueous electrolyte comprises a non-aqueous solvent, a lithium salt and an additive, the non-aqueous solvent comprises a carbonate solvent and a high oxidation potential solvent, and the additive is fluoro cyclic carbonate. The carbonate solvent is chain carbonic ester or a mixture of the chain carbonic ester and cyclic carbonic ester, the high oxidation potential solvent is selected from one or more of compounds shown in a formula I and a formula II, and the fluoro cyclic carbonate is selected from one or moreof compounds shown in a formula III. According to the invention, the electrochemical performance of the lithium ion battery under a high temperature and a high voltage can be improved, the safety performance such as overcharge safety and hot box safety of the lithium ion battery can be improved, and the lithium ion battery can be ensured to have a certain dynamic performance.

Description

technical field [0001] The invention relates to the field of batteries, in particular to a nonaqueous electrolytic solution and a lithium ion battery. Background technique [0002] Lithium-ion batteries are widely used in electric vehicles and consumer electronics due to their advantages such as high energy density, high output power, long cycle life and low environmental pollution. The current demand for lithium-ion batteries is: high voltage, high power, long cycle life, long storage life and excellent safety performance. [0003] Lithium-ion batteries currently widely use a non-aqueous electrolyte system using lithium hexafluorophosphate as a conductive lithium salt and cyclic carbonate and / or chain carbonate as a solvent. However, there are still many deficiencies in the above-mentioned non-aqueous electrolyte. For example, in a high-voltage system, the cycle performance, storage performance and safety performance of the above-mentioned non-aqueous electrolyte need to b...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/0569H01M10/0567H01M10/058H01M10/0525H01M10/42
CPCH01M10/0569H01M10/0567H01M10/058H01M10/0525H01M10/4235H01M2300/0037Y02E60/10Y02P70/50H01M2300/004H01M4/505H01M4/525H01M2004/028
Inventor 梁成都付成华陈培培冯俊敏
Owner CONTEMPORARY AMPEREX TECH CO
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