Preparation method and application of polycarbonate-based polymer electrolyte

A polycarbonate and polymer technology, used in the manufacture of electrolyte batteries, non-aqueous electrolyte batteries, circuits, etc., can solve the problems of low electrochemical window and unsuitable high-nickel cathode material system, so as to eliminate environmental pollution and improve long-term performance. Cyclic stability performance, damage suppression effect
CN109802174AActive Publication Date: 2019-05-24BEIJING UNIV OF TECH
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
BEIJING UNIV OF TECH
Publication Date
2019-05-24

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Abstract

The invention relates to a preparation method and application of a polycarbonate-based polymer electrolyte and belongs to the technical field of lithium ion batteries. According to the preparation method of the present invention, vinyl ethylene carbonate, conductive lithium salt, a porous support material, and a solvent are adopted to prepare the polymer electrolyte. The preparation process of thepolymer electrolyte is simple, easy to control, and has excellent mechanical properties; the thickness of the polymer electrolyte ranges from 50-500 microns; the room temperature ionic conductivity of the polymer electrolyte is larger than 10<-3> S cm<-1>; and the electrochemical window of the polymer electrolyte is larger than 4.7 V. According to the polymer electrolyte adopted, the growth of lithium negative pole dendritic crystals can be effectively inhibited, and the compatibility of the polymer electrolyte with an interface and the long cycle performance of the polymer electrolyte can beimproved. With the polymer electrolyte adopted, a solid-state lithium ion battery can work for a long time at room temperature. The polymer electrolyte has good flexibility and is suitable for flexible lithium ion battery devices of wearable electronic devices.
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Description

technical field

[0001] The invention relates to the field of polymer electrolytes for lithium-ion batteries, in particular to the preparation of a novel polycarbonate-based polymer electrolyte and its application in solid-state lithium-ion batteries, belonging to the technical field of lithium-ion batteries. Background technique

[0002] In recent years, lithium-ion batteries have become more and more widely used due to their high energy density and good reliability. However, commercial batteries mostly use conventional organic liquid electrolytes, such as ethylene carbonate, propylene carbonate, etc. The safety defects such as high chemical activity, volatility, easy fire, and explosion of organic electrolytes have seriously hindered the further popularization and application of lithium-ion batteries. In addition, when lithium metal is used as the negative electrode, lithium dendrites will be formed on the surface of lithium metal with the continuous intercalation and extr...

Claims

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