Polymer solid-state electrolyte material and preparation method therefor

A technology of solid electrolytes and polymers, applied in solid electrolytes, non-aqueous electrolytes, circuits, etc., can solve problems such as limiting the performance of electrolytes, failing to meet industrial production, and failing to significantly improve the mechanical properties of electrolytes, so as to achieve strong controllability in the production process , Improvement of mechanical properties, good processing performance

Active Publication Date: 2017-08-18
HUAZHONG UNIV OF SCI & TECH
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Problems solved by technology

Doping aluminum oxide nanoparticles in a polymer matrix is ​​the earliest report on organic-inorganic composite electrolytes (Solid State Ionics, 1982, 7, 75-79), but unmodified nanoparticles will occur in electrolyte systems Inevitable agglomeration, thus limiting the improvement of electrolyte performance
Then, nanoparticles modified by ionic liquids (Adv. Mater., 2012, 24, 4430-4435) or sulfonic acid groups (Adv. Funct. Mater., 2013, 23, 1019-1027) were also used as fillers for Composite electrolytes are constructed, but the physical blending of inorganic fillers in the polymer matrix cannot significantly improve the mechanical properties of the electrolyte, so it cannot meet the needs of industrial production

Method used

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  • Polymer solid-state electrolyte material and preparation method therefor
  • Polymer solid-state electrolyte material and preparation method therefor

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preparation example Construction

[0030] In the present invention, the preparation method of the inorganic-organic hybrid cross-linked polymer solid electrolyte is to use a certain ratio of silicon dioxide nanoparticles with surface-modified mercapto groups, double bond-terminated polyethylene glycol, photoinitiator and lithium salt The slurry required for the polymerization reaction is pre-prepared, and without adding any external solvent, the system polymerization is initiated by ultraviolet light irradiation to obtain the target solid electrolyte; the lithium-ion battery uses organic-inorganic hybrid cross-linking polymerization A preparation method for a solid state electrolyte material, comprising the following steps:

[0031] (1) Place the silicon dioxide nanoparticles in an aqueous sodium hydroxide solution for activation treatment at 60°C to 90°C for 2 to 24 hours, the ratio of the silicon dioxide nanoparticles to the aqueous sodium hydroxide solution is 1g / 100mL to 1g / 2mL, and then Cool to room temper...

Embodiment 1

[0038] Organic-inorganic hybrid crosslinked network solid electrolyte material, specifically, silica nanoparticles modified with mercaptopropyltrimethoxysilane and polyethylene glycol dimethacrylate with a molecular weight of 200 are crosslinked by ultraviolet light irradiation technology Obtained, the mass ratio of the two is 1 / 2; the doped lithium salt is lithium trifluoromethanesulfonate imide, and the molar ratio of ether oxygen group and lithium element in the system is 10 / 1; the used The photoinitiator is 1-hydroxycyclohexyl phenone, and the photoinitiator accounts for 0.1wt.% of the total mass of reactants.

[0039] The specific preparation method is:

[0040] Disperse 1g of silica particles with an average particle size of 20nm in 100mL of 0.1mol / L sodium hydroxide aqueous solution, oscillate ultrasonically for 30min, then heat and reflux at 80°C for 16h, filter with suction, wash with deionized water several times, and dry to obtain Surface activation of silica nanop...

Embodiment 2

[0042] An organic-inorganic hybrid crosslinked network solid electrolyte material, specifically, silica nanoparticles modified with mercaptopropyltrimethoxysilane and polyethylene glycol dimethacrylate with a molecular weight of 400 are crosslinked by ultraviolet light irradiation technology Obtained, the mass ratio of the two is 1 / 4; the doped lithium salt is lithium trifluoromethanesulfonate imide, and the molar ratio of ether oxygen group and lithium element in the system is 20 / 1; the used The photoinitiator is 2-hydroxyl-2-methylpropiophenone, and the photoinitiator accounts for 0.5wt.% of the total mass of reactants.

[0043] The specific preparation method is:

[0044]Disperse 2g of silica particles with an average particle size of 40nm in 100mL of 1mol / L sodium hydroxide aqueous solution, oscillate ultrasonically for 30min, then heat and reflux at 90°C for 8h, filter, wash with deionized water several times, and dry to obtain the surface Activates silica nanoparticles ...

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Abstract

The invention discloses a polymer solid-state electrolyte material and a preparation method therefor. The polymer solid-state electrolyte material is an organic-inorganic hybridized and crosslinked polymer solid-state electrolyte material which is prepared by performing ultraviolet light irradiation and crosslinking on reaction raw materials, wherein the reaction raw materials comprise silicon dioxide nanoparticles grafted with sulfydryl on the surface and double-band end-capped polyethylene glycol at the mass ratio of 1/2 to 1/20; and in addition, the content of sulfydryl component in the silicon dioxide nanoparticles grafted with sulfydryl on the surface is 1-50wt.%. By means of improvement of the whole technological process, the reaction conditions in each step and the like in the key preparation process, the organic-inorganic hybridized and crosslinked polymer solid-state electrolyte material is correspondingly formed; and compared with the prior art, the ionic electrical conductivity and mechanical performance of the composite electrolyte can be improved at the same time.

Description

technical field [0001] The invention belongs to the field of electrolyte materials for lithium ion batteries, and more specifically relates to a polymer solid electrolyte material and a preparation method thereof. The polymer solid electrolyte material is especially suitable for lithium ion batteries, and by regulating the polymer solid electrolyte material The ratio of various reactants in the preparation process can effectively control the internal network structure of the polymer solid electrolyte material and realize the controllable structure. Background technique [0002] Electrolyte is one of the key materials of lithium-ion batteries, which is placed between the positive and negative electrodes of the battery to transfer charges. Although lithium-ion batteries have been widely used in people's daily life, most of the electrolytes used are traditional flammable organic liquids, which pose a huge safety hazard during repeated charging and discharging. In order to impr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/0565C08J3/28C08J3/24
CPCC08J3/24C08J3/28C08J2371/02H01M10/0565H01M2300/0082Y02E60/10
Inventor 解孝林胡骥薛志刚周兴平郭梦可
Owner HUAZHONG UNIV OF SCI & TECH
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