规范使用订购MOF复合物固体电解质的全固态Li-S电池中离子和聚硫化物的运输
Jia Li1, Fangxi Xie2, Weiwei Pang3
1School of Chemistry and Chemical Engineering, Guangdong Provincial Key Laboratory of Advanced Energy Storage Materials, South China University of Technology, Guangzhou 510640, P. R. China.
Science advances
|March 13, 2024
概括
研究人员使用有序金属有机框架 (MOF) 开发了一种新型复合物固体电解质,以增强离子导电性并抑制全固态硫电池 (ASSLSB) 中的多硫化物穿. 这种策略可以提高电池的性能和稳定性.
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
- 储能 储能 储能 储能 储能 储能
背景情况:
- 全固态硫电池 (ASSLSB) 在平衡高离子导电性和最大限度地减少聚硫化物穿方面面临着挑战.
- 基于聚乙烯氧化物的电解质是有希望的,但需要进行结构修改以获得最佳性能.
研究的目的:
- 在ASSLSB中为复合固体电解质 (CSEs) 引入有序金属有机框架 (MOF) 战略.
- 为了同时调节离子运输和聚硫化物运输.
- 提高ASSLSBs的整体性能和稳定性.
主要方法:
- 将有序的MIL-125-NH2作为填充剂纳入基于聚乙烯氧化物的电解质中,以形成一个三维 (3D) MPPL复合体固体电解质 (CSE).
- 用有序MOF,无序MOF和没有MOF的电解质进行比较分析.
- 使用开发的CSE,对ASSLSB进行电化学测试.
主要成果:
- 与对照电解质相比,3D MPPL CSE 与订制的 MOF 实现了最高的离子导电率 (8.3 × 10−4 S/cm 在 60°C) .
- 使用3D MPPL CSE的ASSLSB在0.5°C和60°C下经过400个周期的稳定循环.
- 订购的MOF结构有效地调节了离子和聚硫化物运输.
结论:
- 在以PEO为基础的电解质中使用订制的MIL-125-NH2作为填充剂的策略对于高性能ASSLSBs是有效的.
- 同时调节离子和聚硫化物运输是可以实现的,为先进的ASSLSB铺平了道路.
- 这种方法为朝着具有优越能量密度和循环稳定的ASSLSB提供了新的途径.
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