在扩展的π-结合的zwitterionic COF中的双极化促进了高性能固态金属电池的Li+对齐运输
Linchu Xu1, Feng Chen1, Ju Duan1
1State Key Laboratory of Advanced Fiber Materials, College of Materials Science and Engineering, Donghua University Shanghai 201620 China yzliao@dhu.edu.cn.
Chemical science
|October 1, 2025
概括
我们设计了一个zwitterionic共价有机框架 (QZwiCOF) 来改进固态金属电池. 这种新材料增强了离子传输和稳定性,使电池具有高速率性能和热弹性.
科学领域:
- 材料科学 材料科学 材料科学
- 电化学 电化学 电化学
- 聚合物科学 聚合物科学
背景情况:
- 固态金属电池 (SLMB) 需要先进的电解质来实现高速率的性能.
- 共价有机框架 (COF) 为电解质设计提供可调节的特性.
- 在SLMB电解质中,实现对齐的离子传输和热稳定仍然是一个挑战.
研究的目的:
- 为了合理设计一个Zwitterionic COF (QZwiCOF) 用于SLMB中增强的复合电解质.
- 研究QZwiCOF对PVDF-HFP基电解质的微观结构和离子传输特性的影响.
- 评估使用开发的复合电解质的SLMB的电化学性能和热稳定性.
主要方法:
- 一个扩展的π-结合的zwitterionic COF (QZwiCOF) 的合成和特征.
- 使用PVDF-HFP制造基于QZwiCOF的复合电解质 (ZiCP CPE).
- 用ZiCP CPE测试Li‖NCM811电池的电化学测试,包括在高温下速度能力和循环稳定性.
- 对复合电解质的离子导电率,Li+转移数和机械/热性能进行分析.
主要成果:
- QZwiCOF有效调节了PVDF-HFP微结构,促进了对齐的Li+运输.
- ZiCP CPE 呈现出增强的离子导电性 (3.44 × 10-4 S cm-1) 和高的 Li+ 转移数 (0.56).
- 采用ZiCP CPE的Li‖NCM811电池表现出优越的速率性能 (145 mAh g-1在3.0C) 和出色的热弹性,在200个循环后在80°C和6.0°C下保持96 mAh g-1.
结论:
- 可以合理设计Zwitterionic COF来调节复合电解质中的离子运输通道.
- QZwiCOF显著提高了基于PVDF-HFP的电解质的性能,用于高速率和热稳定的SLMBs.
- 这种分子级设计策略对开发下一代固态电池电解质充满希望.
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