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Polymer electrolyte for lithium battery and manufacturing method of battery thereof

A polymer and electrolyte technology, which is applied in the manufacture of electrolyte batteries, lithium batteries, secondary batteries, etc., can solve the problems of residual polymerized monomers and initiators, affecting battery performance, and high viscosity of electrolytes, and achieves a simple and easy preparation process row, high capacity, and high cycle performance

Inactive Publication Date: 2010-09-08
GUANGZHOU TINCI MATERIALS TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although this method is simple to operate, it is difficult to eliminate the residues of polymerized monomers and initiators, which will affect the performance of the battery
[0008] It is generally believed that polymers are difficult to dissolve or insoluble in the electrolyte of lithium-ion batteries. Even if they are dissolved, the viscosity of the prepared electrolyte is very high, and it is difficult to infiltrate and infiltrate the electrodes when injected into the battery. The lithium-ion batteries produced in this way , poor performance, difficult to apply

Method used

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  • Polymer electrolyte for lithium battery and manufacturing method of battery thereof
  • Polymer electrolyte for lithium battery and manufacturing method of battery thereof
  • Polymer electrolyte for lithium battery and manufacturing method of battery thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0056] The electrolyte composition is:

[0057] Polymer: methyl methacrylate polymer, molecular weight 20000, adding amount 3.0%, vinyl acetate polymer, molecular weight 80000, adding amount 2.0%;

[0058] Lithium salt: LiPF 6 : 10.0%, LiBF 4 : 2.0%;

[0059] Film-forming additives: vinylene carbonate (VC) 0.5%, 1, 3-propiolactone sulfonate (1, 3-PS) 5.0%;

[0060] Surfactant: Perfluorooctylsulfonyl 3-aminopropyltrimethoxysilane 0.05%;

[0061] The balance is non-aqueous solvent, and its proportion is: EC:PC:DEC=1:1:3.

[0062] Preparation method: Mix non-aqueous solvent, lithium salt, and additives evenly to obtain a mixed solution, add polymer while stirring at 10°C, and obtain a polymer electrolyte after completely dissolving.

Embodiment 2

[0064] The electrolyte composition is:

[0065] Polymer: methyl methacrylate polymer, molecular weight 60000, adding amount 3.0%, vinylidene fluoride polymer, molecular weight 16000, adding amount 1.5%;

[0066] Lithium salt: LiPF 6 : 10.0%, LiBF 4 : 2.0%;

[0067] Film-forming additives: vinylene carbonate (VC) 0.5%, 1, 3-propiolactone sulfonate (1, 3-PS) 5.0%;

[0068] Surfactant: Perfluorooctylsulfonyl 3-aminopropyltrimethoxysilane 0.05%;

[0069] The balance is non-aqueous solvent, and its proportion is: EC:PC:DEC=1:1:3.

[0070] Preparation method: Mix non-aqueous solvent, lithium salt, and additives evenly to obtain a mixed solution, add polymer while stirring at 10°C, and obtain a polymer electrolyte after completely dissolving.

Embodiment 3

[0072] The electrolyte composition is:

[0073] Polymer: polyvinylpyrrolidone, molecular weight 120000, adding amount 2.0%, vinylidene fluoride polymer, molecular weight 50000, adding amount 1.0%;

[0074] Lithium salt: LiPF 6 : 10%;

[0075] Film-forming additives: vinylene carbonate (VC) 0.5%, 1,3-propiolactone sulfonate (1,3-PS) 1.0%, fluoroethylene carbonate (FEC) 1.5%, tris(trimethylsilane) ) Phosphate 0.5%;

[0076] Anti-overcharge additive: biphenyl (BP) 1%;

[0077] Flame retardant: 5% triphenyl phosphate, 8% hexachlorocyclotriphosphazene;

[0078] Electrolyte stabilizer: 0.2% hexamethylene isocyanate;

[0079] The balance is non-aqueous solvent, and its proportion is: EC:PC:DMC:EMC=2:1:3:1.

[0080] Preparation method: Mix non-aqueous solvent, lithium salt, and additives evenly to obtain a mixed solution, add polymer while stirring at 50°C, and obtain a polymer electrolyte after completely dissolving.

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Abstract

The invention discloses polymer electrolyte for a lithium ion battery and a manufacturing method of a battery thereof. The electrolyte is formed by dissolving 0.5 to 15 percent of electrochemical inert polymer with the molecular weight of 5000 to 120000, 6 to 18 percent of lithium salt and various functional additives into a non-aqueous solvent. The additives comprise a film forming additive, an overcharging prevention additive, a flame-retardant additive, a lithium salt stabilizer and a surfactant for enhancing the soaking performance of the electrolyte. In order to solve the preparation difficulty and the performance defect of a polymer battery at present, the invention selects a polymer with proper molecular weight and other functional components of the electrolyte creatively. By the electrolyte, the battery can have the characteristics of a traditional polymer battery and a traditional liquid-state battery, the safety performance, the service life, the high / low-temperature performance and the magnification performance of the battery are comprehensively enhanced, and the preparation of the battery is simple and easy.

Description

technical field [0001] The invention relates to an electrolyte solution for a lithium battery, in particular to a polymer electrolyte solution directly prepared by using a polymer for a lithium battery. Background technique [0002] Lithium-ion batteries have the advantages of high working voltage, high specific energy, long cycle life, environmental friendliness, and no memory effect, and are developing rapidly. However, conventional liquid lithium-ion batteries have safety hazards such as easy leakage and flammability, while polymer lithium-ion batteries overcome the above-mentioned shortcomings of liquid lithium-ion batteries. At the same time, because polymer lithium-ion batteries are packaged with soft materials, the shape design is more flexible and convenient. , so the polymer lithium-ion battery has attracted the attention of the market and is considered to be the most promising secondary battery at present. [0003] There are currently three main types of polymer l...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/056H01M10/052H01M10/058
CPCY02E60/122H01M10/0525H01M10/0565Y10T29/4911Y02E60/10Y02P70/50
Inventor 刘建生蒋灵李永坤周邵云李钊张利萍
Owner GUANGZHOU TINCI MATERIALS TECH
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