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Polymer solid electrolyte film and preparation method thereof

A technology of solid electrolyte membrane and polymer membrane, which is applied to circuits, electrical components, secondary batteries, etc., can solve the problems of low room temperature conductivity of electrolyte membranes, and achieve the effect of simple and easy production process.

Inactive Publication Date: 2009-03-11
UNIV OF SCI & TECH BEIJING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Polyethylene oxide (PEO) generally has high crystallinity, and the room temperature conductivity of the electrolyte membrane is low; there is no polyvinyl butyral as the matrix resin, and low molecular weight polyethylene glycol as the plasticizer. to report

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0014] Embodiment 1: 0.57g lithium nitrate (LiNO 3 ) was dissolved in 15ml of acetone, 0.95g of polyvinyl butyral (PVB) powder was slowly added to the above mixture and kept stirring for 30min, then 0.673g of PEG was added 400 Continue to stir until uniform, pour the obtained solution into a mold and let it stand in the air for 30 hours, and dry it in a vacuum oven at 60° C. for 24 hours to obtain a solid electrolyte membrane with a thickness of 0.382 mm. Measure the room temperature conductivity value of this polymer electrolyte membrane with the battery model described in embodiment 1 7.28 * 10 -7 Scm -1 ; Between 20°C and 80°C, select 5 temperatures of 20°C, 30°C, 50°C, 60°C, and 80°C to test the conductivity of the electrolyte membrane in this embodiment, and the conductivity is the highest at 60°C, reaching 3.29 ×10 -5 Scm -1 .

Embodiment 2

[0015] Embodiment 2: 0.3g lithium nitrate (LiNO 3 ) was dissolved in 15ml of butanol, 0.95g of polyvinyl butyral (PVB) powder was slowly added to the above mixture and continued to stir for 40min, then 0.55g of PEG was added 400 Continue to stir until uniform, pour the obtained solution into a mold and let it stand in the air for 24 hours, and dry it in a vacuum oven at 55° C. for 32 hours to obtain a solid electrolyte membrane with a thickness of 0.567 mm. Measure the room temperature conductivity value of this polymer electrolyte membrane with the battery model described in embodiment 1 2.15 * 10 -5 Scm -1 . In the range of 20°C to 80°C, select 5 temperatures of 20°C, 30°C, 50°C, 60°C, and 80°C to test the conductivity of the electrolyte membrane in this example, and the conductivity is the highest at 60°C, reaching 3.5×10 -3 Scm- 1 .

Embodiment 3

[0016] Embodiment 3: 0.19g lithium perchlorate (LiClO 4 ) was dissolved in 15ml methyl ethyl ketone, slowly added 0.95g polyvinyl butyral (PVB) powder into the above mixture and continued to stir for 35min, then added 0.48g PEG 400 Continue to stir until uniform, pour the obtained solution into a mold and let it stand in the air for 20 hours, and dry it in a vacuum oven at 50° C. for 36 hours to obtain a solid electrolyte membrane with a thickness of 0.637 mm. The room temperature conductivity value of this polymer electrolyte membrane is measured with the battery model described in Example 1 to be 3.26×10 -8 Scm -1 . In the range of 20°C to 80°C, select 5 temperatures of 20°C, 30°C, 50°C, 60°C, and 80°C to test the conductivity of the electrolyte membrane in this example, and the conductivity reaches the highest at 60°C, which is 7.65× 10 -7 Scm -1 .

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Abstract

The invention relates to a polymer solid electrolyte film and a preparation method thereof, which belong to the field of solid electrolyte. The solid electrolyte consists of polyvinyl butyral (PVB), lithium-bearing inorganic salt and a plasticizer, namely low molecular polyethylene glycol. The compositions in weight percentage of the polymer solid electrolyte film are 30 to 75 percent of the polyvinyl butyral, 10 to 85 percent of the lithium-bearing inorganic salt and 5 to 70 percent of the plasticizer. The preparation method comprises the following steps: the lithium-bearing inorganic salt is uniformly mixed with an organic solvent; the polyvinyl butyral powder is slowly added into the mixture and continuously stirred for 30 to 50 minutes; and finally the plasticizer is added. The invention increases the motion of polyvinyl butyral (PVB) segmers and improves the ionic conductivity of the solid electrolyte through the addition of the plasticizer; the room-temperature conductivity of the macromolecular solid electrolyte film prepared is about 10<-5>Scm<-1>, and the conductivity at the temperature of below 60 DEG C is about 10<-3>Scm<-1>; and the film-forming property and the mechanical property are good.

Description

technical field [0001] The invention relates to a solid electrolyte membrane and a preparation method thereof. Background technique [0002] Electrolyte is one of the components that constitute ion batteries, and the focus of current research is how to improve the conductivity of the electrolyte. Electrolyte materials are divided into three types: liquid electrolytes, all-solid electrolytes, and solid polymer electrolytes. Liquid electrolytes provide the best ionic conductivity, but have issues such as the release of toxic or flammable gases, requiring a more heavily loaded and energetic cell area to withstand changes in gas pressure. Solid electrolyte systems can be processed into various shapes or sizes and have the required mechanical properties, but have low conductivity due to the limited range of molecular motion. The polymer electrolyte can reduce the degree of crystallization of the polymer by adding plasticizers and other methods, form a polymer network with a sui...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L29/14C08K3/24C08K3/28C08K5/053C08J5/18H01M10/40
CPCY02E60/122
Inventor 王金伟李雅雯
Owner UNIV OF SCI & TECH BEIJING
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