Electrolyte solution and lithium ion battery comprising same

An electrolyte and lithium salt technology, which is applied in battery electrodes, secondary batteries, organic electrolytes, etc., can solve problems such as poor wettability of electrolytes, improve high-temperature storage performance, storage performance and cycle performance, and increase rate performance Effect

Active Publication Date: 2016-02-24
NINGDE AMPEREX TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the irregular shape of the shaped battery, the problem of poor electrolyte wettability is more serious

Method used

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  • Electrolyte solution and lithium ion battery comprising same
  • Electrolyte solution and lithium ion battery comprising same
  • Electrolyte solution and lithium ion battery comprising same

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1～17

[0129] Examples 1-17 Preparation of conventional lithium-ion batteries 1-17 and special-shaped lithium-ion batteries S1-S17

[0130] Conventional lithium-ion batteries (abbreviated as batteries) 1-17, special-shaped lithium-ion batteries (abbreviated as batteries) S1-S17 are prepared according to the following method:

[0131] (1) Preparation of positive electrode sheet

[0132] Lithium cobalt oxide (LiCoO 2 ), binder (polyvinylidene fluoride), conductive agent (acetylene black) according to the weight ratio of LiCoO 2 : polyvinylidene fluoride: acetylene black = 98: 1: 1 to mix, add N-methylpyrrolidone (NMP), stir under the action of a vacuum mixer until the system becomes uniform and transparent, and obtain positive electrode slurry; Coated on an aluminum foil with a thickness of 12 μm; the aluminum foil was dried at room temperature and then transferred to an oven at 120° C. for 1 hour, and then subjected to cold pressing and slitting to obtain a positive electrode sheet....

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PUM

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Abstract

The invention relates to an electrolyte solution and a lithium ion battery comprising the electrolyte solution. The electrolyte solution comprises a lithium salt, an organic solvent and an additive, wherein the organic solvent comprises a carboxylic ester compound; and the additive comprises a fluoro-ether compound and a dinitrile compound with ether bonds. The electrolyte solution is applied into the lithium ion battery, and particularly after the electrolyte solution is applied into specially-shaped lithium ion batteries, the high-temperature storage performance, high-temperature cycle performance and rate performance of the lithium ion battery can be improved.

Description

technical field [0001] The present application relates to the technical field of lithium-ion batteries, in particular to an electrolyte and a lithium-ion battery including the electrolyte. Background technique [0002] In battery design, the wettability of the electrolyte is very important. It is usually expected that solvents and liquid electrolytes are adsorbed by the hydrophilic surface of the positive electrode material. However, the hydrophobic surface of materials such as polyolefins and carbon negative electrodes is repellent to solvents and liquid electrolytes. At present, the electrolyte of lithium-ion batteries often uses a mixed solvent of cyclic carbonate and chain carbonate as a non-aqueous organic solvent. Since both cyclic carbonate and chain carbonate are aprotic solvents, their viscosity is high and the surface tension is high. Too large, so that the affinity between the electrolyte and the diaphragm material is small, and the diaphragm material is difficult...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/0567H01M10/0569H01M10/0525
CPCH01M10/0525H01M10/0567H01M10/0569H01M2300/0025H01M2300/0028Y02E60/10H01M4/131H01M4/133H01M4/525H01M4/587H01M4/622H01M4/623H01M4/625H01M4/661H01M10/0568H01M2004/027
Inventor 庄锐锐
Owner NINGDE AMPEREX TECH
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