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Solid polymer electrolyte added with high-concentration lithium salt and preparation method thereof

A solid polymer and electrolyte technology, applied in batteries, circuits, electrical components, etc., can solve the problems of limited application, low ionic conductivity, low mechanical strength, etc., achieve good electrochemical and interface stability, high room temperature conductivity , prepare a simple effect

Inactive Publication Date: 2017-04-26
HARBIN INST OF TECH WUXI RES INST OF NEW MATERIALS +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, these polymers have certain disadvantages: polyvinylidene fluoride-hexafluoropropylene, polyacrylonitrile, polyacrylamide, and polymethyl methacrylate are commonly used as gel polymer electrolytes, which have high ionic conductivity, but due to the low mechanical strength of the gel polymer electrolyte, it is easy to short-circuit the battery when it is violently impacted.
Polyoxyethylene and polyoxypropylene can be used as all-solid polymer electrolytes, however, low ionic conductivity limits their applications

Method used

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  • Solid polymer electrolyte added with high-concentration lithium salt and preparation method thereof

Examples

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Effect test

Embodiment 160

[0018] Example 1 Preparation of polymer electrolyte with 60% lithium salt addition

[0019] Add 2 g of polyvinyl carbonate and 40 g of acetonitrile into a 100 ml reagent bottle and stir at room temperature for 6 h to obtain a homogeneous solution. Add 3 g of lithium bistrifluoromethanesulfonimide to the above solution and stir at room temperature for 6 h. After completely dissolving, a uniform mixed solution is obtained, and the mixed solution is injected into a polytetrafluoroethylene (PTFE) mold to dry to form a film, and vacuum dried to obtain a solid polymer electrolyte membrane.

Embodiment 2

[0020] Example 2 Adding SiO 2 Preparation of polymer electrolyte with 73% lithium salt addition

[0021] 1 g polyvinyl carbonate, 0.5 g SiO 2 (15 nm) and 40 g of acetonitrile were added to a 100 ml reagent bottle and stirred at room temperature for 6 h to obtain a homogeneous solution. Add 4 g of lithium bistrifluoromethanesulfonyl imide to the above solution and stir at room temperature for 6 h. After completely dissolving Obtain a uniform mixed solution, inject the mixed solution into a PTFE mold, dry it to form a film, and dry it in vacuum to obtain a solid polymer electrolyte membrane.

Embodiment 380

[0022] Example 3 Preparation of 80% Lithium Salt Addition Polymer Electrolyte

[0023] Add 1 g of polyvinyl carbonate and 40 g of acetonitrile into a 100 ml reagent bottle and stir at room temperature for 6 h to obtain a homogeneous solution. Add 4 g of lithium bistrifluoromethanesulfonimide to the above solution, and stir at room temperature for 6 h. After completely dissolving, a uniform mixed solution is obtained, and the mixed solution is injected into a polytetrafluoroethylene (PTFE) mold to dry to form a film, and vacuum dried to obtain a solid polymer electrolyte membrane.

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Abstract

The invention discloses a solid polymer electrolyte added with a high-concentration lithium salt. The solid polymer electrolyte comprises a lithium salt and solid polycarbonate, wherein the lithium salt is dispersed in a substrate of the solid polycarbonate; and the solid polymer electrolyte comprises 40-90 percent by weight of lithium salt. The solid polymer electrolyte is easy to prepare, and has high room-temperature conductivity, high electrochemical performance and high interface stability.

Description

technical field [0001] The invention relates to a solid polymer electrolyte added with high-concentration lithium salt and a preparation method thereof. Background technique [0002] Large-scale energy storage systems have become an important part of the future smart grid. The development of high-efficiency energy storage technologies has significant social and economic benefits for improving the utilization efficiency of existing power generation systems, power quality, and promoting the widespread application of renewable energy. One of the most promising technologies for industrialization in energy storage technology is electrochemical energy storage technology. Lithium-ion batteries are regarded as the most competitive electrochemical storage technology due to their light weight, high specific energy / specific power, and long life. It is one of the energy technologies, and it is more and more widely used in various aspects of energy storage. However, at present, large-sc...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/0565H01M10/0525
CPCH01M10/0525H01M10/0565H01M2220/10Y02E60/10
Inventor 白永平赵彦彪安茂忠陈国荣白杨李卫东席丹殷晓芬
Owner HARBIN INST OF TECH WUXI RES INST OF NEW MATERIALS
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