Lithium ion battery and electrolyte thereof

An electrolyte and lithium salt technology, which is applied in the field of lithium-ion batteries and their electrolytes, can solve the problems affecting the electrochemical performance of the battery and the decline in battery performance

Active Publication Date: 2019-03-05
CONTEMPORARY AMPEREX TECH CO
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the existing additives mostly use biphenyl, cyclohexylbenzene, etc. and their derivatives. These additives can play a certain role in battery safety, but will affect the normal electrochemical performance of the battery, especially the charge and discharge performance and high temperature storage. Performance, at the same time, it will generate a large amount of gas during charging and discharging, resulting in a decline in battery performance

Method used

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  • Lithium ion battery and electrolyte thereof
  • Lithium ion battery and electrolyte thereof
  • Lithium ion battery and electrolyte thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0059] 1) Preparation of negative electrode sheet

[0060] Mix negative electrode active material graphite, conductive agent acetylene black, binder styrene-butadiene rubber, and thickener sodium carboxymethyl cellulose in a weight ratio of 95:2:2:1. After adding deionized water, fully stir to form a uniform negative electrode slurry; this slurry is coated on the copper foil of the negative electrode current collector, dried and cold pressed to obtain the negative electrode sheet.

[0061] 2) Preparation of positive electrode sheet

[0062] The cathode active material LiNi 1 / 3 co 1 / 3 mn 1 / 3 o 2 , the conductive agent acetylene black, and the binder polyvinylidene fluoride are mixed in a weight ratio of 96:2:2, and the solvent N-methylpyrrolidone is added, and after fully stirring and mixing, a uniform positive electrode slurry is formed; the slurry is coated Cover it on the aluminum foil of the positive electrode current collector, dry and cold press to obtain the positiv...

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PUM

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Abstract

The invention discloses a lithium ion battery and electrolyte thereof. The electrolyte comprises a nonaqueous organic solvent, lithium salts, and additives. The nonaqueous organic solvent contains a methyl ester compound (A). The additives comprise a polycyano compound (B) and a hydrocarbyl lithium phosphite compound (C). Compared with the prior art, through the cooperation among the methyl estercompound (A), the polycyano compound (B), and the hydrocarbyl lithium phosphite compound (C) in the electrolyte, the reactions between the solvent and the lithium are prevented, the overcharge performance and high temperature storage performance of the lithium ion battery are obviously improved, and the safety performance of the lithium ion battery is enhanced.

Description

technical field [0001] The invention belongs to the field of batteries, and more specifically, the invention relates to a lithium ion battery and an electrolyte thereof. Background technique [0002] Lithium-ion batteries are widely used in mobile communication equipment such as mobile phones, mobile cameras, notebook computers, mobile phones and other electronic products due to their high energy density, high power density, good cycle performance, no memory effect, and environmental protection. , At the same time, lithium-ion batteries have also become strong candidates for future electric vehicle energy supply systems. [0003] At present, the safety of lithium-ion batteries has become one of the biggest obstacles to the commercialization of large-scale lithium-ion batteries. Overcharging of lithium-ion batteries can easily cause dangers such as explosion and fire. The traditional method is to prevent the battery from overcharging by installing a gas pressure detection d...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/0567H01M10/0569H01M10/0525
CPCH01M10/0525H01M10/0567H01M10/0569Y02E60/10
Inventor 史松君张翠戴璐魏奕民谢岚王珂王海山
Owner CONTEMPORARY AMPEREX TECH CO
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