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对复合体固体电解质的研究,其离子具有双选择性封闭接口结构,用于高性能金属电池

Hongkai Hu¹, Weiya Li¹, Haojing Liu¹

¹School of Materials Science and Engineering, Ocean University of China, Qingdao 266100, P. R. China.

ACS applied materials & interfaces

|January 10, 2024

概括

研究人员使用双选择性封闭接口开发了一种用于固态电池 (SSLB) 的新型复合体固体电解质. 这种设计增强了离子 (Li+) 传输,提高了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
固态电池固态电池固态电池

背景情况:

固态电池 (SSLB) 提供了更高的安全性和能量密度,但受到固态电解质的低离子导电性和接口问题的限制.
开发先进的固态电解质对于克服这些局限性和实现下一代能源存储至关重要.

研究的目的:

设计和合成一种具有双选择性封闭接口结构的新型复合固体电解质,以提高SSLB性能.
调查离子封闭的机制及其对复合电解质中阴离子运输的影响.
评估SSLB的电化学特性和循环稳定性,使用开发的电解质.

主要方法:

复合固体电解质 (HMOF-DNSE) 的制造,使用聚乙烯化物-六烯 (PVDF-HFP),聚二-甲基) 双三甲硫胺 (PDADMATFSI) 和金属有机框架衍生物 (HMOF).
电解质的离子导电性,电化学窗口和Li+转移数的表征.
组装和测试LiFePO4/HMOF-DNSE/Li电池以评估容量,速度能力和长期循环稳定性.

主要成果:

该HMOF-DNSE复合电解质表现出0.7mS cm-1的高室温离子导电率和4.5V的宽电化学窗口.
由于双选择性封闭接口有效地限制了离子运动,因此获得了0.56的高Li+转移数 (tLi).
该LiFePO4/HMOF-DNSE/Li电池表现出极好的性能,在1C时容量为141.5mAhg-1,在500个循环后容量保持率为80.1%.

结论:

拟议的双选择性限制接口策略有效地通过限制大离子来增强Li + 运输.
新的HMOF-DNSE复合体固体电解质显示出高性能和稳定的固态电池的巨大潜力.
这种材料设计方法为开发用于储能应用的先进固态电解质提供了宝贵的见解.

关键词:

MOF MOF MOF MOF MOF MOF MOF MOF MOF MOF MOF MOF MOF MOF MOF MOF MOF MOF MOF MOF MOF MOF 复合的固体电解质复合物双网络结构是双网络结构.金属电池电池是一种金属电池.这是一种多离子液体.

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