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Inorganic nanometer particle modified polymer electrolyte and preparation method thereof

An inorganic nanoparticle and polymer technology, applied in circuits, electrical components, secondary batteries, etc., can solve the problem of not significantly improving the mobility of PEO segments, and achieve inhibition of crystallization, high ionic conductivity, and improved ionic conductivity. Effect

Active Publication Date: 2013-04-24
HUAZHONG UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The results show that nanoparticle doping can effectively improve the diffusion of lithium ions and increase the conductivity, but it does not significantly improve the mobility of the PEO segment

Method used

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  • Inorganic nanometer particle modified polymer electrolyte and preparation method thereof
  • Inorganic nanometer particle modified polymer electrolyte and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] 2g nano-SiO 2 Disperse in 20ml of ammonia water with pH=8.5 to obtain nano-SiO 2 / ammonia dispersion. Add 10 mL of silane coupling agent-containing methanol solution with a mass fraction of 20% to the above solution in batches, stir at 50°C, let stand for 12 hours, filter through a microporous membrane, wash with ethanol and deionized water, and dry get nano-SiO 2 Ionic salt, wherein the structural formula of the silane coupling agent is (CH 3 O) 3 Si(CH 2 ) 5 N(CH 3 )(C 10 h 21 ) 2 Cl.

[0021] The resulting nano-SiO 2 Ionic salts are added to ethoxy-containing sulfonates with the formula C 9 h 9 -C 6 h 4 -(OCH 2 CH 2 ) 30 -O(CH 2 ) 3 SO 3K, stirred at 60°C for 12 hours. After the reaction, the reaction product was washed with deionized water, centrifuged and precipitated until the supernatant became colorless, and the precipitate was dried at 100°C to obtain nano-SiO grafted with ionic compounds containing ethoxy groups. 2 .

[0022] Nano-SiO ...

Embodiment 2

[0024] 1g nano TiO 2 Disperse in 15ml of ammonia water with PH=8 to get nano TiO 2 / ammonia dispersion. Add 7.5mL of silane coupling agent-containing methanol solution with a mass fraction of 20% to the above solution in batches, stir at 50°C, let stand for 12 hours, filter through a microporous membrane, wash with ethanol and deionized water, and dry Nano TiO 2 Ionic salt, wherein the structural formula of the silane coupling agent is (CH 3 O) 3 Si(CH 2 ) 10 N(CH 3 )(C 10 h 21 ) 2 Cl.

[0025] The resulting nano-SiO 2 Ionic salts are added to ethoxy-containing sulfonates with the formula C 9 h 9 -C 6 h 4 -(OCH 2 CH 2 ) 50 -O(CH 2 ) 3 SO 3 K, stirred at 60°C for 24 hours. After the reaction, the reaction product was washed with deionized water, centrifuged and precipitated until the supernatant became colorless, and the precipitate was dried at 100°C to obtain nano-TiO grafted with ionic compounds containing ethoxy groups. 2 .

[0026] Nano-TiO grafted...

Embodiment 3

[0028] 2g nanometer Al 2 o 3 Disperse in 25ml of ammonia water with pH=9 to obtain nano-Al 2 o 3 / ammonia dispersion. Add 5 mL of methanol solution containing 50% silane coupling agent in batches to the above solution, stir at 50°C, let stand for 12 hours, filter through a microporous membrane, wash with ethanol and deionized water, and dry get nano Al 2 o 3 Ionic salt, wherein the structural formula of the silane coupling agent is (CH 3 O) 3 Si(CH 2 ) 30 N(CH 3 )(C 10 h 21 ) 2 Cl.

[0029] The resulting nano-Al 2 o 3 Ionic salts are added to ethoxy-containing sulfonates with the formula C 9 h 9 -C 6 h 4 -(OCH 2 CH 2 ) 40 -O(CH 2 ) 3 SO 3 K, stirred at 60°C for 24 hours. After the reaction, the reaction product was washed with deionized water, centrifuged and precipitated until the supernatant became colorless, and the precipitate was dried at 100°C to obtain nano-Al grafted with ionic compounds containing ethoxy groups. 2 o 3 .

[0030] Nano-Al g...

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Abstract

By aiming at the characteristics of high crystallization of a main polymer and low lithium-ion conductivity of the current lithium-ion battery polymer electrolyte, the invention provides an ethyoxyl-containing ionic type compound grafted inorganic nanometer particle modified polymer electrolyte and a preparation method thereof. The preparation method comprises the steps of: firstly activating nanometer particles; then reacting the activated nanometer particles with silane coupling agent having one end per se as quaternary ammonium salt; then performing ion exchange with sulfonate containing an ethyoxyl chain so as to obtain ionic type compound modified nanometer particles; and finally adding the obtained nanometer particles into a polymer electrolyte. For one aspect, the ionic type compound modified nanometer particles can inhibit crystallization of the polymer; and for the other aspect, the grafted ethyoxyl-containing compound also can serve as a new ion conduction channel to improve ionic conductivity. The prepared polymer electrolyte can be applied to preparation of high-performance solid lithium-ion polymer batteries.

Description

technical field [0001] The invention relates to the field of lithium ion battery polymer electrolytes, in particular to a polymer electrolyte modified by inorganic nanoparticles and a preparation method thereof. Background technique [0002] With the continuous consumption of global fossil energy and the increasingly prominent environmental problems, it is very urgent to find an environmentally friendly, efficient and safe energy storage device. Lithium-ion battery, as a new type of energy storage battery, is regarded as a strong competitor of the next-generation power battery due to its advantages such as high capacity and high energy density, and is also considered to be the battery closest to commercialization. Structurally speaking, a lithium-ion battery consists of positive and negative electrode materials and an intermediate electrolyte layer. The electrolyte layer in current commercial lithium-ion batteries mainly includes an intermediate separator and an electrolyte...

Claims

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Application Information

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IPC IPC(8): H01M10/0565
CPCY02E60/12Y02E60/10
Inventor 解孝林王晓恩罗颖燕龚春丽薛志刚廖永贵周兴平
Owner HUAZHONG UNIV OF SCI & TECH
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