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Electrolyte solution and battery

An electrolyte and battery technology, applied in the field of energy storage materials, can solve the problems affecting the performance of lithium-ion secondary batteries, the deterioration reaction of positive active materials, etc., and achieve the effect of improving high-voltage cycle performance

Active Publication Date: 2019-02-26
CONTEMPORARY AMPEREX TECH CO
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AI Technical Summary

Problems solved by technology

[0004] However, for example, at a high voltage of 4.5V, the conventional electrolyte will be oxidized and decomposed on the surface of the positive electrode of the battery. The oxidative decomposition of the electrolyte itself will also promote the deterioration of the positive active material, which will further affect the performance of the lithium-ion secondary battery. , such as cycle performance, storage performance and overcharge performance

Method used

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  • Electrolyte solution and battery
  • Electrolyte solution and battery
  • Electrolyte solution and battery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1～10

[0082] Examples 1-10 Preparation of lithium ion secondary batteries (hereinafter all referred to as batteries) 1-10

[0083] Batteries 1 to 10 were prepared according to the following method:

[0084] (1) Preparation of negative electrode sheet

[0085] The negative electrode active material graphite, conductive agent acetylene black, binder styrene butadiene rubber, thickener sodium carboxymethyl cellulose according to the weight ratio of graphite: acetylene black: styrene butadiene rubber: sodium carboxymethyl cellulose = 95:2 : Mix 2:1. After adding deionized water, fully stir and mix to form a uniform negative electrode slurry; coat this slurry on the negative electrode current collector copper foil, then dry and cold press to obtain a negative electrode sheet.

[0086] (2) Preparation of positive electrode sheet

[0087] The positive electrode active material lithium nickel manganese cobalt ternary material, conductive agent acetylene black, and binder polyvinylidene fluoride are ...

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Abstract

The invention relates to the field of energy storage materials, particularly to an electrolyte solution and a battery. The electrolyte solution of the invention comprises an organic solvent, an electrolyte and an additive, wherein the additive comprises a fluorophosphate compound and lithium sulfide. According to the electrolyte solution provided by the invention, the electrolyte solution comprises both fluorophosphate and lithium sulfide, so the high-voltage cycle performance, storage performance and overcharge performance of the battery can be remarkably improved.

Description

Technical field [0001] This application relates to the field of energy storage materials, specifically, to an electrolyte and a battery. Background technique [0002] In the rapidly developing information age, the demand for mobile phones, notebooks, cameras and other electronic products has increased year by year. As the working power source of electronic products, batteries, especially lithium ion secondary batteries, have the characteristics of high energy density, no memory effect, and high working voltage, and are gradually replacing traditional Ni-Cd and MH-Ni batteries. [0003] At present, the positive electrode active materials used in lithium ion secondary batteries mainly include lithium manganate, lithium cobalt oxide, ternary materials, lithium iron phosphate, etc. Under normal circumstances, the above-mentioned positive electrode material is selected as lithium The charge cut-off voltage of ion batteries does not exceed 4.2V, but with the advancement of technology an...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/0567H01M10/0525H01M10/42
CPCH01M10/0525H01M10/0567H01M10/4235H01M2300/0025Y02E60/10
Inventor 谢岚史松君肖松松王耀辉王海山
Owner CONTEMPORARY AMPEREX TECH CO
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