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Polymer electrolyte membrane and preparation method thereof

An electrolyte membrane and polymer technology, which is applied in the field of electrolyte membranes for lithium ion batteries, can solve the problems of poor particle ion conductivity, affect the performance of electrolyte membranes, particle agglomeration, etc., and achieve good thermal stability and electrochemical interface stability. , Improve the ionic conductivity, inhibit the effect of crystallization

Inactive Publication Date: 2017-01-18
CHINA JILIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the high specific surface energy of nanoparticles, it is easy to cause particle agglomeration, resulting in poor dispersion of particles in the polymer and poor ion conductivity of the particles, which in turn affects the performance of the electrolyte membrane.

Method used

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  • Polymer electrolyte membrane and preparation method thereof
  • Polymer electrolyte membrane and preparation method thereof
  • Polymer electrolyte membrane and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] Get 2.48g lithium trifluoromethanesulfonimide (LiTFSI, LiN(SO 2 CF 3 ) 2 )and 1 . 5g fast ion conductor (Li 1.3 Al 0.3 Ti 1.7 (PO 4 ) 3 ) doped TiO 2 Inorganic filler powder (200-500nm) was added to 100 g of 1-methyl-2-pyrrolidone solution of MEEEP with a mass fraction of 10%, stirred and dispersed at 60°C for 20 hours, and cast on a polypropylene non-woven membrane The polymer electrolyte membrane was obtained after vacuum drying at 70°C for 48 hours.

Embodiment 2

[0020] Get 1.24g lithium trifluoromethanesulfonylimide (LiTFSI, LiN(SO 2 CF 3 ) 2 ), 0.84g lithium bisoxalate borate (LiBOB, LiB(C 2 o 4 ) 2 ) and 1.0g fast ion conductor (Li 1.3 Al 0.3 Ti 1.7 (PO 4 ) 3 ) doped TiO 2 Inorganic filler powder (200-500nm) was added to 160 grams of MEEEP dimethylformamide solution with a mass fraction of 5%, stirred and dispersed at 40°C for 12 hours, and cast on a polypropylene non-woven membrane to form a film. The polymer electrolyte membrane was obtained after vacuum drying at 70° C. for 48 hours.

Embodiment 3

[0022] Get 1.34g lithium bisoxalate borate (LiBOB, LiB(C 2 o 4 ) 2 ) and 1.92g fast ion conductor (Li 1.3 Al 0.3 Ti 1.7 (PO 4 ) 3 ) doped SiO 2 Inorganic filler powder (80 ~ 200nm) was added to 120 grams of dimethyl sulfoxide solution with a mass fraction of 8% MEEEP, stirred and dispersed at 50°C for 16 hours, and cast on a polypropylene non-woven diaphragm to form a film at 70 The polymer electrolyte membrane was obtained after vacuum drying at ℃ for 36 hours.

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Abstract

The invention provides a polymer electrolyte membrane for lithium ion batteries, the electrolyte membrane is based on oligoether-grafted polyphosphazene polymer, and includes an appropriate amount of lithium salt and oligoether-grafted polyphosphazene Doped small-sized inorganic fillers introduced into polymers. The present invention also provides a method for preparing a polymer electrolyte membrane, the method comprising: dissolving an oligoether grafted polyphosphazene polymer (MEEEP) in a solvent, and preparing a base material with a concentration of 2% to 15% by mass solution; disperse the inorganic filler doped with lithium salt and fast ion conductor (Li1.3Al0.3Ti1.7(PO4)3) into the matrix material solution to obtain the dispersed solution; cast the dispersed solution on the diaphragm to form a film and vacuum drying to obtain the oligoether grafted polyphosphazene-based polymer electrolyte membrane. Using the method provided by the invention to prepare the polymer electrolyte membrane improves the lithium ion conductivity and lithium ion migration number of the polymer electrolyte membrane, and improves the electrochemical and safety performance of the lithium ion battery.

Description

technical field [0001] The invention relates to an electrolyte membrane for a lithium ion battery, more specifically, to a polymer electrolyte membrane and a preparation method thereof. Background technique [0002] Lithium-ion batteries have the advantages of high energy density, high output voltage, high output power, low self-discharge, wide operating temperature range, fast charging and discharging speed, etc. Therefore, lithium-ion batteries are widely used in consumer electronics products, power tools, aviation and military products Wait. At present, the electrolytes used in lithium-ion batteries are basically organic solvent electrolytes containing lithium salts, which often cause safety problems such as leakage, flammability, and explosion. Therefore, polymer electrolytes with higher safety are used as a substitute for traditional electrolytes. products have attracted the attention of researchers. [0003] Polymer electrolytes are prepared from polymers, plasticize...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M2/16H01M2/14
CPCH01M10/056H01M10/0567H01M10/058H01M50/409H01M50/403Y02E60/10
Inventor 陈达舒康颖杨兰生傅相德何华陈威司明月
Owner CHINA JILIANG UNIV
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