Composite polymer electrolyte for lithium ion battery and preparation method thereof

A composite polymer and lithium-ion battery technology, applied in secondary batteries, circuits, electrical components, etc., to achieve the effects of promoting lithium salt dissociation, improving dispersion performance, and inhibiting agglomeration

Inactive Publication Date: 2011-05-04
SHANGHAI NAT ENG RES CENT FORNANOTECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, nanoparticles have high specific surface energy and are easy to agglomerate in polymers, thus losing the efficacy of nanoparticles

Method used

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  • Composite polymer electrolyte for lithium ion battery and preparation method thereof
  • Composite polymer electrolyte for lithium ion battery and preparation method thereof
  • Composite polymer electrolyte for lithium ion battery and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] Example 1: Take 0.5 grams of nano-TiO with a hydrophilic surface and a particle size of 5-8nm 2 , dispersed in 100 milliliters of toluene, ultrasonically dispersed for 30 minutes, under mechanical stirring conditions, after slowly adding 2 milliliters of methoxypolyethylene glycol acrylate, the temperature was raised to 80 o C, continued to react for 6 hours, the white emulsion obtained was centrifuged, and the white solid obtained was washed three times with deionized water and dehydrated ethanol respectively, at 60 o C drying under vacuum conditions, that is, surface modified nano-TiO 2 . attached figure 1 The modified nano-TiO that this embodiment makes 2 Nano-TiO before modification 2 The Fourier transform infrared spectrum of the modified nano-TiO can be found 2 Significant C–H stretching and bending vibration absorption appeared in , indicating the efficient generation of surface-modified coatings. Get 0.05 gram of above-mentioned modified nano-TiO 2 Dis...

Embodiment 2

[0024] Example 2: Take 0.2 grams of nano-TiO with a hydrophilic surface and a particle size of 5-8nm 2 , dispersed in 100 ml of toluene, ultrasonically dispersed for 30 minutes, under mechanical stirring conditions, after slowly adding 0.5 ml of methoxypolyethylene glycol acrylate, the temperature was raised to 80 o C, continued to react for 12 hours, the white emulsion obtained was centrifuged, and the white solid obtained was washed three times with deionized water and absolute ethanol respectively, and was washed at 60 o C drying under vacuum conditions, that is, surface modified nano-TiO 2 . Get 0.1 gram of above-mentioned modified nano-TiO 2 Dispersed into 8 grams of acetonitrile solution of polyacrylonitrile-methyl acrylate copolymer (P(AN-MMA)) with a mass fraction of 5%, stirred for 2 hours, and coated the obtained uniform viscous solution on a clean glass plate on, cast film, at 60 o The polymer film obtained after evaporating the solvent under the condition C c...

Embodiment 3

[0025] Example 3: Get 1 gram of nano-SiO with a particle size of 20 nm obtained by hydrolysis of alkoxide 2 , dispersed in 100 ml of toluene, ultrasonically dispersed for 30 minutes, under mechanical stirring conditions, after adding 0.2 ml of methoxypolyethylene glycol acrylate, the temperature was raised to 80 o C, continue to react for 12 hours, the white emulsion of gained is centrifuged, and the white solid that obtains washes three times respectively with deionized water and absolute ethanol, at 60 o C dried under vacuum conditions to constant weight, that is, surface modified nano-SiO 2 . Take 1 gram of the above-mentioned modified nano-SiO 2 , 9 grams of acrylonitrile (AN), 0.09 grams of azobisisobutyronitrile (AIBN) and 30 milliliters of N,N-dimethylformamide (DMF) were dispersed into In a 100 ml three-necked flask, after ultrasonic dispersion for 2 hours, the temperature was raised to 60 after 0.5 hours of nitrogen gas oC, stirred for 24 hours, and the resultin...

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Abstract

The invention relates to a composite polymer electrolyte for a lithium ion battery and a preparation method thereof. The electrolyte takes a polymer as a matrix, and an organic-inorganic composite polymer electrolyte formed by modified nano fillers is uniformly dispersed in the matrix; the modified nano fillers comprise nano oxides, ferroelectric powder or lithium-containing compounds, and the mass of the modified nano fillers accounts for 0.5%-30% of that of the polymers; and the polymers comprise polyoxyethylene, polyacrylonitrile, polymethylmethacrylate, polyvinylidene fluoride and polyvinylidene fluoride-hexafluoropropylene copolymer and a blending and copolymerization system thereof. In the invention, methoxylpolyethylene glycol acrylate is adopted to modify the nano fillers, and the surface modification improves the dispersing performance of a polymer system, therefore, the aggregation of nano particles in the polymer system is restrained, the function of the nano particles for promoting the dissociation of lithium salt in the polymer electrolyte is better exerted, a fast ion conduction channel of the fillers / polymer interface is formed and forms dispersive stress of a three-dimensional network with the polymeric matrix. Therefore, the mechanical property of the whole polymer system is improved.

Description

technical field [0001] The invention relates to a composite polymer electrolyte and a preparation method thereof, in particular to a composite polymer electrolyte for a lithium ion battery and a preparation method thereof. Background technique [0002] Lithium-ion battery has the characteristics of high energy density, high output voltage, no memory effect, and environmental friendliness. It is a kind of green chemical power source with good economic benefits, social benefits and strategic significance, which has attracted the attention of academia and industry. Since its commercialization in the mid-1990s, it has been widely used in mobile communications, digital products, aerospace and other fields, and is considered to be the most promising power battery for electric vehicles. However, there are many safety problems caused by the use of flammable, volatile, and highly reactive organic liquid electrolytes in lithium-ion batteries. For example, the main component of liqui...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/0565
CPCY02E60/10
Inventor 张鹏王丹王瑾金彩虹何丹农
Owner SHANGHAI NAT ENG RES CENT FORNANOTECH
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