聚离子液体复合PEO制备高性能全固态聚合物电解质

Study on a novelpoly(ionic liquid)/poly(ethylene oxide)solid electrolyte for stable high-performance lithium metal battery

徐祖婧 ¹赵相峰¹

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作者信息

1. 贵州大学化学与化工学院,贵阳 550025
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摘要

用化学共沉淀法固态聚合物电解质(SPE)因其独特的安全性能受到越来越多的关注.以聚环氧乙烷(PEO)为基体,通过引入聚离子液体(PIL),制备了一种新型SPE(PIL@PEO SPE).通过将PIL穿插于PEO链段中,有效降低了 PEO的结晶度,提高了 SPE的离子电导率(6.63×10-4 S/cm).由其制备的固态电池在0.5C,60 ℃时,Li/LiFePO4电池首次放电容量高达147.6 mAh/g,经过长达300圈充放电循环,容量保留率仍然在90％以上.

Abstract

Solid polymer electrolytes(SPEs)have received increasing attention due to their unique safety proper-ties.In this paper,a novel SPE(PIL@PEO SPE)was prepared by introducing poly(ionic liquid)(PIL)using poly(ethylene oxide)(PEO)as the matrix.By interspersing PIL in PEO chain segments,the crystallinity of PEO was effectively reduced,and the ionic conductivity of SPE was improved(6.63 × 10-4 S/cm).The solid-state battery prepared showed a high first discharge capacity of 147.6 mAh/g for Li/LiFePO4 cells at 0.5C,60 ℃,and the capacity retention remained above 90％after up to 300 turns of charge/discharge cycles.

关键词

固态聚合物电解质/聚离子液体/聚氧化乙烯/锂离子电池

Key words

solid polymer electrolytes/polyionic liquids/polyethylene oxide/lithium ion batteries

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基金项目

贵州省教育厅自然科学研究项目(黔教技[2022]001号)

出版年

2024

功能材料

重庆材料研究院中国仪器仪表学会仪表材料学会

功能材料

CSTPCD北大核心

影响因子：0.918

ISSN：1001-9731

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