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Polymer electrolyte membrane and preparation method thereof

A technology of electrolyte membrane and polymer, which is applied in the field of electrolyte membrane for lithium-ion batteries, can solve the problems of poor ion conductivity of particles, affect the performance of electrolyte membrane, and poor dispersion, so as to improve the conductivity of lithium ions and the migration number of lithium ions , good elasticity and processing performance, good mechanical properties

Inactive Publication Date: 2015-03-04
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 polymer electrolyte membrane adopts low-polyether-grafted polyphosphazene polymer as the base material and comprises appropriate amount of lithium salt and doping type small-size inorganic filler introduced to the low-polyether-grafted polyphosphazene polymer. The invention further provides a method for preparing the polymer electrolyte membrane. The method comprises the following steps: dissolving the poly[bis2-(2-(2-methoxyethoxy)ethoxy)ethoxyphosphazene] (MEEEP) into a solvent to prepare a base material solution with the mass percent concentration being 2-15%, dispersing the inorganic filler doped with the lithium salt and a fast ion conductor into the base material solution to obtain the dispersed solution, pouring the dispersed solution on the membrane to form a membrane in a curtain coating manner, and performing vacuum drying to obtain the MEEEP electrolyte membrane. With adoption of the method for preparing the MEEEP electrolyte membrane, the lithium-ion conductivity and the lithium-ion transference number of the MEEEP electrolyte membrane are improved, and the electrochemistry and safety performance of the lithium ion batteries are improved.

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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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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