Polymer with V-shaped polyether side chain and preparation method of polymer as polymer solid electrolyte

By grafting short-chain polyethylene oxide on the polymer side chains at high density to form a polymer with V-shaped polyether side chains, the problem of poor lithium ion transmission rate and conductivity in the prior art is solved, and higher segment motion ability and flexibility are achieved, and the comprehensive performance of solid electrolytes is improved.

CN119751756AActive Publication Date: 2025-04-04HUAZHONG UNIV OF SCI & TECH
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Patent Information

Application Number
CN202411953377.9
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2024-12-27
Publication Date
2025-04-04
Estimated Expiration
2044-12-27

AI Technical Summary

Technical Problem

Existing polymer solid electrolytes perform poorly in lithium ion transfer rates and conductivity, mainly due to the regular structure of long-chain polyethylene oxide, resulting in high crystallinity, low chain segment motion ability and flexibility.

Method used

Using polymers with V-shaped polyether side chains, the comprehensive performance of solid electrolytes is improved by grafting short-chain polyethylene oxide on the polymer side chains at high density to enhance the chain segment movement ability and the free volume of lithium ions.

Benefits of technology

By improving the amorphous region ratio, segment motion ability and flexibility of the polymer, the transmission rate of lithium ions and the ionic conductivity of the solid electrolyte are significantly improved, and the safety and performance of the battery are improved.

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Abstract

The invention belongs to the technical field of functional polymers, and particularly relates to synthesis of a polymer with a V-shaped polyether side chain and a preparation method of the polymer as a polymer solid electrolyte. The polymer is # imgabs0 # or # imgabs1 #, the structure of a side chain R is # imgabs2 # n, m is the degree of polymerization, x and y are positive integers from 1 to 30, R1-R and R2 are structural units forming the polymer, the structure of R1-R does not contain lithium ions, and the structure of R2 contains lithium ions. A side group R is heteroatom-containing polyether with a V-shaped structure, an ethylene oxide chain segment in the structure can be complexed and decomplexed with lithium ions to play roles in dissolving and conducting lithium salt, and R3 is multivalent elements such as P, N, C and Si. High-density short-chain polyethylene oxide is grafted on the side chain of the polymer, so that the long-range ordered regular structure of the polymer is broken, the polymer is endowed with the characteristics of low crystallinity and flexible movement of the side chain, the free volume of lithium ions capable of being transmitted and migrated is increased, and the ionic conductivity is further improved.
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