雕刻金属-有机-框架玻璃基固态电解质通过金属电池的自上而下的策略
Yang Xiang1, Ning Yu2,3, Jianbo Li2,3
1School of Materials Science and Engineering, State Key Laboratory of Clean Energy Utilization, Zhejiang University, Hangzhou, 310027, China.
Angewandte Chemie (International ed. in English)
|January 20, 2025
概括
我们开发了一种具有独特3D结构的新型多孔MOF玻璃凝聚合物电解质 (PMG-GPE). 这种先进的电解质增强了离子导电性,并抑制了树的生长,从而产生更安全,更持久的固态电池.
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:
- 传统的聚合物固体电解质 (PSEs) 在离子导电性,动力学和安全性方面存在局限性.
- 开发先进的电解质对于高性能固态电池至关重要.
研究的目的:
- 引入一种具有层次性孔隙结构的新型多孔MOF玻璃凝聚合物电解质 (PMG-GPE).
- 为了研究孔隙结构和离子运输特性之间的关系.
- 评估电池中PMG-GPE的电化学性能和安全性.
主要方法:
- 使用自上而下的策略制造PMG-GPE.
- 使用TOF-SIMS,MAS NMR和MD模拟进行毛孔结构的表征.
- 电化学测试,包括离子导电量测量和电池循环性能.
主要成果:
- PMG-GPE具有3D相互连接的分级孔径结构,增强了离子传输.
- 最佳的宏孔分数 (17%) 起到桥梁作用,加速离子运动.
- 实现了1.9mS/cm的高离子导电性.
- 在对称电池中,已证明抑制了树的生长和高临界电流密度 (5.1 mA/cm^2).
- 在Li/PMG-GPE/LFP半电池中经过1400个循环后,表现出超过6000小时的稳定循环和83.12%的容量保留.
结论:
- PMG-GPE的分层孔结构显著提高了离子导电性和电池性能.
- PMG-GPE具有强大的机械性能,通过抑制树突形成来提高安全性.
- 这种新型电解质为商业化高性能固态电池提供了一个有前途的途径.
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