Lithium-containing silica sol doped PVDF composite gel polymer electrolyte film and preparation method thereof

A technology of electrolyte film and composite gel, which is applied in the direction of circuits, electrical components, secondary batteries, etc., can solve the problems of failing to directly improve the lithium ion transfer capacity, and achieve the goal of promoting electrochemical performance, promoting crystallinity, and promoting reduction Effect

Inactive Publication Date: 2015-10-07
JIANGSU UNIV OF SCI & TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Previous studies focused on the direct doping of the inorganic phase into the organic phase to prepare composite polymer electrolytes. The inorganic fillers used include Al 2 o 3 , TiO 2 , SiO 2 and Sm 2 o 3 etc., but all these fillers are non-ionic conductors, and their doping into the system fails to directly improve the transfer ability of lithium ions in the system

Method used

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  • Lithium-containing silica sol doped PVDF composite gel polymer electrolyte film and preparation method thereof
  • Lithium-containing silica sol doped PVDF composite gel polymer electrolyte film and preparation method thereof
  • Lithium-containing silica sol doped PVDF composite gel polymer electrolyte film and preparation method thereof

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] (1) Mix 11.8g KH560 with 20.8g TEOS, add hydrochloric acid dropwise to adjust the pH to 3, raise the temperature to 65°C, and react for 5 hours to form a silica sol. Then 2.4g LiOH was gradually added into the reaction system at this temperature, and the reaction was carried out for 2 hours to obtain a lithium-containing silica sol.

[0022] (2) The molecular weight of 9.6g is M n =5×10 5 Add PVDF powder into 55.53g of DMF solution, stir at room temperature for 18 hours, add 0.2g of lithium-containing silica sol, and stir for another 6 hours until completely dissolved. The polymer solution was left to defoam, and then spread on the glass plate with a spatula, and the thickness was controlled at 30 μm. Then, using methanol as the precipitant, the lithium-containing silica sol-doped PVDF composite porous membrane was prepared by immersion precipitation.

[0023] (3) Dry the lithium-containing silica sol-doped PVDF composite porous membrane under vacuum conditions at 80°...

Embodiment 2

[0028] (1) Mix 23.6g KH560 with 20.8g TEOS, add hydrochloric acid dropwise to adjust the pH to 2, raise the temperature to 70°C, and react for 6 hours to form a silica sol. Then 4.8g LiOH was gradually added into the reaction system at this temperature, and the reaction was carried out for 1.5 hours to obtain a lithium-containing silica sol.

[0029] (2) The molecular weight of 8g is M n =5×10 5 PVDF powder was added to 56.67g of DMF solution, stirred at room temperature for 12 hours, then 2g of lithium-containing silica sol was added, and stirred for another 12 hours until it was completely dissolved. After the polymer solution was left to defoam, it was evenly coated on a glass plate with a spatula, and its thickness was controlled at about 35 μm. Then, methanol was used as a precipitant to prepare a lithium-containing silica sol doped PVDF composite porous membrane by immersion precipitation.

[0030] (3) Dry the lithium-containing silica sol-doped PVDF composite porous m...

Embodiment 3

[0032](1) Mix 11.8g KH560 and 31.2g TEOS, add hydrochloric acid dropwise to adjust the pH to 4, raise the temperature to 75°C, and react for 7 hours to form a silica sol. Then 2.4g LiOH was gradually added into the reaction system at this temperature, and the reaction was carried out for 1 hour to obtain a lithium-containing silica sol.

[0033] (2) The molecular weight of 10g is M n =5×10 5 PVDF powder was added to 73.67g of DMF solution, stirred at room temperature for 24 hours, then 3g of lithium-containing silica sol was added, and stirred for another 8 hours until completely dissolved. After the polymer solution was left to defoam, it was evenly coated on a glass plate with a spatula, and its thickness was controlled at about 50 μm. Then, methanol was used as a precipitant to prepare a lithium-containing silica sol doped PVDF composite porous membrane by immersion precipitation.

[0034] (3) Dry the lithium-containing silica sol doped PVDF composite porous membrane unde...

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Abstract

The invention discloses a PVDF doped lithium-containing silica sol composite gel polymer electrolyte film and its making method. The thickness of the film is 30-50mum, and the film is made through using 1-10% by mass of a lithium-containing silica sol, 30-48% by mass of polyvinylidene fluoride having a molecular weight of 5*10<5>, and 50-61% by mass of a 1M lithium hexafluorophosphate carbonate electrolyte. The preparation method of the film comprises the following steps: preparing the lithium-containing silica sol through a sol-gel method, blending the lithium-containing silica sol with an N',N-dimethyl formamide solution of PVDF, preparing a composite polymer porous film through adopting an immersing precipitation method, drying the porous film, and adsorbing with a liquid electrolyte to obtain the composite gel polymer electrolyte film. The composite gel polymer electrolyte film has an ion conductivity of 3.87*10<-2>Scm<-1> and an electrochemical window of 5.1V at 30DEG C. The composite gel polymer electrolyte film has good prospects in the polymer lithium ion battery field and the like.

Description

technical field [0001] The invention relates to a polymer electrolyte, more specifically to a lithium-containing silicon sol doped PVDF composite gel polymer electrolyte film and a preparation method for polymer lithium ion batteries. Background technique [0002] Polymer electrolyte is an important part of polymer lithium ion battery, and its importance in the battery is beyond doubt. It not only plays the role of ion conduction, but also acts as the separator of the battery, separating the positive and negative electrodes of the battery. Doping inorganic nanoparticles into polymer electrolytes to prepare organic-inorganic composite polymer electrolytes is a new trend in product development. The mixing of nanoparticles can effectively improve the mechanical properties, heat resistance, and electrochemical stability of electrolyte materials. Previous studies focused on the direct doping of the inorganic phase into the organic phase to prepare composite polymer electrolytes....

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M10/0565C08J5/18
CPCY02E60/10
Inventor 李为立邢玉金杨刚
Owner JIANGSU UNIV OF SCI & TECH
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