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An electrolyte and a 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: 2020-12-11
CONTEMPORARY AMPEREX TECH CO
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  • Abstract
  • Description
  • Claims
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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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  • An electrolyte and a battery
  • An electrolyte and a battery
  • An electrolyte and a battery

Examples

Experimental program
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Effect test

Embodiment 1～10

[0082] Preparation of Examples 1-10 Lithium-ion secondary battery (hereinafter referred to as battery) 1-10

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

[0084] (1) Negative plate preparation

[0085] Negative electrode active material graphite, conductive agent acetylene black, binder styrene-butadiene rubber, thickener sodium carboxymethylcellulose are graphite in weight ratio: acetylene black: styrene-butadiene rubber: sodium carboxymethylcellulose=95:2 : 2:1 for mixing, after adding deionized water, fully stir and mix to form a uniform negative electrode slurry; apply this slurry on the copper foil of the negative electrode current collector, then dry and cold press to obtain the 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 lithium nickel ma...

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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] The present application relates to the field of energy storage materials, in particular, 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 is increasing 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 manganese oxide, lithium cobalt oxide, ternary materials, lithium iron phosphate, etc., under normal circumstances, the above-mentioned positive electrode materials are selected. The charging cut-off voltage of lithium-ion batteries does not exceed 4.2V, but with the adva...

Claims

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Application Information

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Patent Type & Authority Patents(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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