Preparation method of PMMA-based gel polymer electrolyte

A polymer and electrolyte technology, which is applied in the manufacture of electrolyte batteries, non-aqueous electrolyte batteries, circuits, etc., can solve the problems of high brittleness of polymer films, inability to assemble and use, hindering the research of PMMA-based gel polymer electrolytes, etc., to achieve Effects of improving pore structure, increasing ionic conductivity, and improving electrochemical performance

Pending Publication Date: 2019-05-21
GUANGDONG TEAMGIANT NEW ENERGY TECH CORP
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Problems solved by technology

[0002] At present, the preparation methods of gel polymer electrolyte mainly include phase inversion method, pouring film forming method, screen printing method and electrospinning method, among which the phase inversion method has the characteristics of fast film forming speed, environmental friendliness and simple operation. , the crystallinity of pure PMMA is high, and the polymer film prepared directly by the phase inversion method is very brittle, which can

Method used

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  • Preparation method of PMMA-based gel polymer electrolyte
  • Preparation method of PMMA-based gel polymer electrolyte
  • Preparation method of PMMA-based gel polymer electrolyte

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preparation example Construction

[0041] refer to figure 1 Shown, the invention provides a kind of preparation method of PMMA base gel polymer electrolyte, comprises steps:

[0042] S1: Preparation of clathrate polyhedral oligomeric silsesquioxane POSS.

[0043] Said step S1 includes the following processes:

[0044] (1) Seal and stir a certain volume ratio of ethyl acetate (EAC), vinyltrimethoxysilane (VTMS) and γ-methacryloxypropyltrimethoxysilane (MPS) for 10-60min, and mix Uniform;

[0045] (2), the preparation volume fraction is the hydrochloric acid aqueous solution of 10%~50%, it is added dropwise in the mixed solution of step (1);

[0046] (3), sealing and stirring the mixture in step (2) in a water bath at 20-40°C for 2-8 days;

[0047] (4), the product obtained in step (3) is repeatedly washed and suction-filtered more than 3 times with a sufficient amount of methanol;

[0048] (5) Baking the product obtained in step (4) under vacuum at 60-80° C. for more than 12 hours to obtain POSS.

[0049] ...

Embodiment 1

[0069] Example 1 - POSS content 5%

[0070]Mix EAC, VTMS and MPS in a volume ratio of 12:3:1, and after airtight stirring for 10 min, then add 30% hydrochloric acid aqueous solution dropwise to the mixed solution, then stir in a water bath at 20°C for 4 days, and let stand One day later, the product was repeatedly washed and filtered three times with a sufficient amount of methanol, and then vacuum-baked at 60° C. for 12 hours to obtain POSS nanoparticles. Then mix 0.03g POSS, 0.57g MMA and 0.8ml DMF, stir in a water bath at 70°C until POSS / MMA is completely dissolved, immediately apply the hot solution on polypropylene non-woven fabric, immerse in 50% hydrochloric acid aqueous solution, keep it for 1 hour, then take it out Air-dried at room temperature for 12 hours, and then transferred to a 60°C oven for vacuum baking for 6 hours to obtain a 5% POSS / PMMA composite membrane. The composite membrane was soaked in 1mol / L LiPF6 electrolyte for 20 minutes to obtain a gel polymer...

Embodiment 2

[0071] Example 2 - POSS content 10%

[0072] Mix EAC, VTMS and MPS in a volume ratio of 12:3:1, and after airtight stirring for 10 min, then add 30% hydrochloric acid aqueous solution dropwise to the mixed solution, then stir in a water bath at 20°C for 4 days, and let stand One day later, the product was repeatedly washed and filtered three times with a sufficient amount of methanol, and then vacuum-baked at 60° C. for 12 hours to obtain POSS nanoparticles. Then mix 0.06g POSS, 0.54g MMA and 0.8ml DMF, stir in a 70°C water bath until the POSS / MMA is completely dissolved, immediately apply the hot solution on the polypropylene non-woven fabric, immerse in 50% hydrochloric acid aqueous solution, keep it for 1h, take it out Air-dried at room temperature for 12 hours, and then transferred to a 60°C oven for vacuum baking for 6 hours to obtain a 10% POSS / PMMA composite membrane. The composite membrane was soaked in 1mol / L LiPF6 electrolyte for 20 minutes to obtain a gel polymer ...

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Abstract

The invention discloses a preparation method of PMMA-based gel polymer electrolyte. The preparation method comprises the following steps: S1, preparing a cage-shaped polyhedral oligomeric silsesquioxane; S2, physical mixing of POSS and MMA; S3, body polymerization of MMA; S4, phase conversion of a POSS/PMMA composite film; S5, drying of the POSS/PMMA composite film; and S6, gelation of the POSS/PMMA. The problem that the PMMA prepared through the phase conversion method is bad in film-forming property; the pore structure of the PMMA-based gel polymer electrolyte is improved through doping modification and matching optimization, the electrochemical property of the PMMA-based gel polymer electrolyte is improved, and the ion conductivity is greatly improved.

Description

technical field [0001] The invention relates to the field of lithium batteries, in particular to a preparation method of a PMMA-based gel polymer electrolyte. Background technique [0002] At present, the preparation methods of gel polymer electrolyte mainly include phase inversion method, pouring film forming method, screen printing method and electrospinning method, among which the phase inversion method has the characteristics of fast film forming speed, environmental friendliness and simple operation. , The crystallinity of pure PMMA is high, and the polymer film prepared directly by the phase inversion method is very brittle, which cannot meet the requirements of mechanical properties at all, and cannot be assembled and used. [0003] Utilize phase inversion method to prepare PMMA-based polymer film-forming property is extremely poor, and ionic conductivity also needs to be improved, is difficult to meet mechanical property and electrical property requirement, has serio...

Claims

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Application Information

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IPC IPC(8): H01M10/0565H01M10/058H01M10/052C08F120/14C08F283/12C08F220/14
CPCY02E60/10Y02P70/50
Inventor 雷付权胡立平叶茂
Owner GUANGDONG TEAMGIANT NEW ENERGY TECH CORP
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