非易燃固态聚合物电解质的拼图式分子组件,用于安全和高压金属电池
Junjie Chen1, Changxiang He1, Xudong Peng1
1Department of Mechanical and Aerospace Engineering, The Hong Kong University of Science and Technology, Clear Water Bay, Kowloon, Hong Kong SAR, China.
Nature communications
|September 26, 2025
概括
研究人员开发了一种新的固态聚合物电解质,用于更安全,更高能量的金属电池. 这种新的电解质提供了更好的导电性和稳定性,为实际的电池应用铺平了道路.
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
- 聚合物化学 聚合物化学
背景情况:
- 固态聚合物电解质对于高特异能金属电池至关重要.
- 目前的限制包括低离子导电性,较差的Li+传输,狭窄的电压窗口和易燃性.
研究的目的:
- 开发一种安全的高压固态聚合物电解质,具有增强的离子导电性和稳定性.
- 解决当前聚合物电解质的实际应用挑战.
主要方法:
- 一个类似于拼图的分子组装策略,使用现场聚合.
- 在乙烯基乙烯碳酸盐基质中将三酸和六甲基酸片段纳入.
- 电化学测试,包括离子导电性,转移数和循环稳定性测量.
- 使用加速率热度计和指甲透测试进行安全评估.
主要成果:
- 在25°C达到高离子导电率 (0.432 mS cm-1) 和Li+转移数 (0.70).
- 证明了5.15V的高氧化电压,具有强大的有机丰富的间相.
- 在100°C时,Li气体的LiNi0.6Co0.2Mn0.2O2电池在300个周期内稳定循环,Li气体的LiFePO4电池在120个周期内稳定循环.
- 一个2.6Ah袋式电池达到349Wh kg-1.1的特定能量.
- 通过安全测试验证的卓越的不易燃性和高安全性.
结论:
- 开发的聚合物电解质克服了现有的固态电解质的主要局限性.
- 分子组装策略使金属电池具有高性能和安全性.
- 该材料显示了实用,高能耗和安全电池应用的巨大潜力.
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