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Polymer electrolyte of lithium ion battery and preparation method thereof

A lithium-ion battery, lithium polymer technology, applied in the manufacture of electrolyte batteries, solid electrolytes, non-aqueous electrolytes, etc., can solve the problems of poor stability of gel polymer electrolytes, poor compatibility of electrode materials, and narrow electrochemical windows, etc. Achieve the effect of excellent lithium ion conductivity, simple production process, and high ion conductivity

Inactive Publication Date: 2014-07-09
LVCHI AUTO TECH SHANGHAI CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The gel polymer electrolyte is composed of polyethylene oxide, ionic liquid, lithium salt and mesoporous molecular sieve SBA-15. The gel polymer electrolyte has high conductivity, but because its preparation method is only a simple dispersion and mixing process, thus There is a narrow electrochemical window, poor compatibility with electrode materials, and liquid leakage during use
[0007] According to the above, the pure solid polymer electrolyte in the current polymer electrolyte has the defect of low ionic conductivity, while the gel polymer electrolyte has poor stability and has the defect of leakage.

Method used

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  • Polymer electrolyte of lithium ion battery and preparation method thereof

Examples

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Effect test

Embodiment 1

[0036]1) 25 parts by weight of polypropylene oxide are dissolved in toluene to form a solution, then 45 parts by weight of 1-ethyl-2-methylpyrazole tetrafluoroborate and 2 parts by weight of alkylphenol Add oxyethylene ether formaldehyde into the solution, and slowly stir and emulsify at a speed of 40r / min for 20min, so that 1-ethyl-2-methylpyrazole tetrafluoroborate forms tiny droplets in the solution and disperses evenly In solution;

[0037] 2) Add the solution obtained in step 1) into the polymerization kettle to carry out self-polymerization and self-crosslinking reactions to form 1-ethyl-2-methylpyrazole tetrafluoroborate as the core and polypropylene oxide as the core The tiny particles with microcapsule structure in the shell layer are discharged and dried;

[0038] 3) Evenly disperse the tiny particles with a microcapsule structure obtained in step 2) into dimethylformamide, then add 5 parts by weight of lithium tetrafluoroborate and 6 parts by weight of polyvinyl ch...

Embodiment 2

[0041] 1) 35 parts by weight of polyethylene succinate are dissolved in acetone to form a solution, and then 35 parts by weight of 1-methyl-3-ethyl imidazolium dicyanoimine and 5 parts by weight of arane Add phenol polyoxyethylene ether formaldehyde into the solution, and slowly stir and emulsify for 30 minutes at a speed of 80r / min, so that 1-methyl-3-ethylimidazolium dicyanoimine forms tiny droplets in the solution, uniform dispersed in the solution;

[0042] 2) Add the solution obtained in step 1) into the polymerization kettle to carry out self-polymerization and self-crosslinking reactions to form polyethylene succinate with 1-methyl-3-ethylimidazolium dicyanoimine as the core The ester is a shell of tiny particles with a microcapsule structure, which is discharged and dried;

[0043] 3) Evenly disperse the tiny particles with a microcapsule structure obtained in step 2) into dimethyl acetylene, then add 5 parts by weight of lithium bisoxalate borate and 12 parts by weig...

Embodiment 3

[0046] 1) Dissolve 30 parts by weight of polyvinylidene fluoride in acetonitrile to form a solution, then mix 35 parts by weight of N-methyl-N-propylpyrrole trifluoromethanesulfonamide and 3 parts by weight of polyoxyethylene polyoxyethylene Add the propylene block copolymer into the solution, and slowly stir and emulsify at a speed of 50r / min for 30min, so that N-methyl-N-propylpyrrole trifluoromethanesulfonamide forms tiny droplets in the solution and disperses evenly In solution;

[0047] 2) Add the solution obtained in step 1) into the polymerization kettle for self-polymerization and self-crosslinking reactions to form N-methyl-N-propylpyrrole trifluoromethanesulfonamide as the core and polyvinylidene fluoride as the shell Tiny particles with microcapsule structure in the layer are discharged and dried;

[0048] 3) Evenly disperse the tiny particles with a microcapsule structure obtained in step 2) into N-methylpyrrolidone, then add 6 parts by weight of lithium trifluoro...

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Abstract

The invention relates to polymer electrolyte of a lithium ion battery and a preparation method thereof. The preparation method comprises the steps of coating ion liquid with a lithium conducting polymer to form microcapsule-shaped micro particles with high lithium ion conductivity, dispersing the microcapsule-shaped micro particles into a solvent, adding lithium salt and a substrate material, and curing through coagulation bath to prepare a polymer electrolyte membrane of the lithium battery. The polymer electrolyte not only has the advantages of high ion conductivity, no liquid leakage in the application process and good mechanical property, but also is simple in preparation method, low in production cost, suitable for industrialized production and wide in application range.

Description

technical field [0001] The invention relates to the field of lithium battery materials, in particular to a polymer electrolyte for lithium ion batteries and a preparation method thereof. Background technique [0002] Lithium-ion batteries have the characteristics of high working voltage, high energy density, long charge and discharge life, small self-discharge, small size, no memory effect, and environmental protection. They have become one of the most promising energy storage batteries today. At present, it has been widely used in many fields such as military defense, electric vehicles, portable digital devices, etc. At the same time, the requirements for its performance are getting higher and higher, especially in terms of safety, specific energy, high and low temperature performance and cycle stability. There is still room for improvement and improvement. Lithium-ion batteries are mainly composed of five parts: positive electrode, negative electrode, electrolyte, diaphr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/0565H01M10/058
CPCH01M10/0525H01M10/0565H01M2300/0082Y02E60/10Y02P70/50
Inventor 陈庆李兴文
Owner LVCHI AUTO TECH SHANGHAI CO LTD
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