Lithium ion battery electrolyte and lithium ion battery

A lithium-ion battery and electrolyte technology, applied in secondary batteries, circuits, electrical components, etc., can solve problems such as thermal runaway and poor safety performance

Active Publication Date: 2020-10-30
HUIZHOU BYD IND
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present disclosure is to provide

Method used

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  • Lithium ion battery electrolyte and lithium ion battery
  • Lithium ion battery electrolyte and lithium ion battery
  • Lithium ion battery electrolyte and lithium ion battery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0105] (1) Preparation of electrolyte:

[0106] The electrolyte solution was prepared in a glove box, the moisture in the glove box was controlled at ≤1ppm, and the temperature was 25°C. 250g ethylene carbonate (EC), 450g ethyl methyl carbonate (EMC), 150g diethyl carbonate (DEC) were uniformly mixed to make a mixed solvent, and 130g lithium hexafluorophosphate (LiPF 6 ), so that the concentration of the lithium salt is 1mol / L, then 51g of perfluoropolyether ethanol is added thereto, its chemical structural formula is compound 1, the weight average molecular weight is 2130, and a in compound 1 is 30 on average.

[0107] (2) Preparation of battery:

[0108] Mix 100 parts of graphite material, 1 part of conductive agent super-p, 1.5 parts of thickener sodium carboxymethylcellulose (CMC) and 2.5 parts of styrene-butadiene rubber (SBR) binder into a uniform paste , evenly coated on the copper foil as the negative electrode collector, and dried under vacuum at 80°C for 24h to obt...

Embodiment 2

[0111] The battery was prepared in the same manner as in Example 1, except that the additive in the electrolyte was 51 g of perfluoropolyether formamide, its chemical structural formula was Compound 2, the weight average molecular weight was 2400, and the average value of a in Compound 2 was 19 , to prepare battery S2.

Embodiment 3

[0113] The battery was prepared in the same manner as in Example 1, except that the additive in the electrolyte was 51 g of perfluoropolyether acyl fluoride, its chemical structural formula was Compound 3, the weight average molecular weight was 3300, and the average value of a in Compound 3 was 18 , to prepare battery S3.

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Abstract

The invention relates to a lithium ion battery electrolyte. The electrolyte comprises a lithium salt, a solvent and a first additive, wherein based on 100 parts by weight of the electrolyte, the content of the first additive is 1-10 parts by weight, the first additive contains a compound shown as a formula (I): CxF<2x+1>Oy-A-R, and the weight-average molecular weight of the compound is 2000-5000;x and y are integers, x is greater than or equal to 0 and less than or equal to 6, y is greater than or equal to 0 and less than or equal to 1, A is a perfluoropolyether group, and R is selected fromone or more of a partially-fluorinated or completely-fluorinated alkyl alcohol group, an alkyl amide group, an alkyl acyl group, an alkyl amine group, an alkenyl carboxylate group and a siloxane group. The lithium ion battery containing the electrolyte disclosed by the invention is good in safety performance, and other electrochemical properties of the lithium ion battery can be ensured to be stable.

Description

technical field [0001] The present disclosure relates to the field of lithium-ion batteries, and in particular, to an electrolyte solution of a lithium-ion battery and a lithium-ion battery. Background technique [0002] Lithium-ion batteries have the advantages of small memory effect, high output voltage, high energy density, good cycle performance, and easy miniaturization. They are widely used in electronic products and other industrial fields. The safety performance of batteries is very important to our life and property. very important. Battery safety tests include extrusion, acupuncture, short circuit, drop and overcharge, etc. Among them, the acupuncture test is the most stringent safety test, which has been difficult to pass, especially for high-voltage lithium cobalt oxide batteries and ternary nickel-cobalt-manganese batteries. High energy density batteries such as batteries. This means that the safety performance of the battery is not up to standard, and the ess...

Claims

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Application Information

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IPC IPC(8): H01M10/0525H01M10/0567
CPCH01M10/0567H01M10/0525Y02E60/10
Inventor 钟海敏王圣黄荣刚陶蒙
Owner HUIZHOU BYD IND
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