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Lithium ion battery electrolyte, preparation method thereof, and lithium ion battery

A technology of electrolyte and lithium battery, which is applied in the field of electrolyte, can solve the problems of liquid analysis failure, etc., and achieve the effect of strong wrapping ability, good low temperature performance, and high ion conductivity

Inactive Publication Date: 2017-05-31
DEYANG JIUDING ZHIYUAN INTPROP OPERATION CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Adding a liquid organic solvent with high dielectric constant and low relative molecular mass such as PC to the solid polymer electrolyte can greatly improve the solubility of the conductive salt. The electrolyte formed is the GPE gel polymer electrolyte, which has a high Excellent ionic conductivity, but it will fail due to liquid separation during use

Method used

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  • Lithium ion battery electrolyte, preparation method thereof, and lithium ion battery

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specific Embodiment 1

[0018] Specific Example 1: First, 1,5-naphthalenediamine and succinic acid are polymerized in bulk with a molar ratio of 1:1 and polymerized under an initiator to form a prepolymer with a molecular weight lower than 50,000, and the lithium salt is dissolved in An electrolyte matrix of 80%-95% is configured in the organic solvent, and the electrolyte matrix is ​​a lithium salt: LiBF4, and the solvent is ethylene carbonate;

[0019] Mix the electrolyte matrix with the prepolymer and the crosslinking agent, stir evenly, wherein the weight of the prepolymer is 5% of the mass of the electrolyte matrix, and at room temperature, use a vacuum liquid injection device to infiltrate the diaphragm and the positive electrode. In the negative electrode material, seal the above mixture, and fully infiltrate the separator for more than 2 hours; polymerize at 30°C to form a colloid.

specific Embodiment 2

[0020] Specific Example 2: Firstly, 2,3-naphthalene diamine and maleic acid are bulk polymerized at a molar ratio of 1:1 and polymerized under an initiator to form a prepolymer with a molecular weight lower than 50,000, and the lithium salt is dissolved In the middle of the organic solvent, it is configured as a 95% electrolyte matrix, and the electrolyte matrix is ​​lithium salt as LiClO 4 , the solvent is propylene carbonate;

[0021] Mix the electrolyte matrix with the prepolymer and crosslinking agent, stir evenly, wherein the weight of the prepolymer is 20% of the mass of the electrolyte matrix, and at room temperature, use a vacuum liquid injection device to infiltrate the diaphragm and the positive electrode. In the negative electrode material, seal the above mixture, and fully infiltrate the separator for more than 2 hours; polymerize at 70°C to form a colloid.

specific Embodiment 3

[0022] Specific embodiment 3: at first 2,7-naphthalenediamine and 2-carbonylsuccinic acid are 1:1 bulk polymerization under the initiator polymerization formation molecular weight is lower than the prepolymer of 50000 with molar ratio, described lithium The salt is dissolved in an organic solvent to form a 90% electrolyte matrix, and the electrolyte matrix is ​​a lithium salt: LiAsF 6 , the solvent is dimethyl carbonate;

[0023] Mix the electrolyte matrix with the prepolymer and crosslinking agent, stir evenly, wherein the weight of the prepolymer is 15% of the mass of the electrolyte matrix, and at room temperature, use a vacuum liquid injection device to infiltrate the separator and the positive and negative electrodes In the material, seal the above mixture, and fully infiltrate the diaphragm for more than 2 hours; polymerize at 50°C to form a colloid.

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Abstract

The invention discloses a lithium battery electrolyte, a preparation method thereof, and a lithium ion battery, and belongs to the field of lithium batteries. The raw material formula of the lithium ion electrolyte providing good low temperature performance and high electricity conductivity comprises an electrolyte matrix and a polymer monomer, and the polymer monomer contains at least one naphthalene ring monomer containing an amino group and at least one monomer containing two carboxyl groups.

Description

technical field [0001] The invention relates to the field of lithium batteries, and the specific invention lies in the electrolyte. Background technique [0002] Electrolyte is one of the four key materials of lithium-ion batteries (positive electrode, negative electrode, diaphragm, and electrolyte). It is known as the "blood" of lithium-ion batteries and plays the role of conducting electrons between the positive and negative electrodes in the battery. Guarantee of high voltage, high specific energy and other advantages. The organic solvent is the main part of the electrolyte and is closely related to the performance of the electrolyte. Generally, a high dielectric constant solvent and a low viscosity solvent are used in combination. [0003] Electrolytes can be divided into liquid electrolytes and solid polymers, and solid polymer electrolytes can generally be divided into dry solid polymer electrolytes and gel polymer electrolytes. The SPE solid polymer electrolyte is m...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/0565H01M10/0525
CPCH01M10/0525H01M10/0565H01M2300/0082Y02E60/10
Inventor 陈福彦
Owner DEYANG JIUDING ZHIYUAN INTPROP OPERATION CO LTD
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