在固态电解质中增强自由离子的移动性,通过长距离组装有孔的材料来实现
Gi Hwan Kim1, Jinha Jang1, Jiheong Kang1
1Department of Materials Science and Engineering, Korea Advanced Institute of Science and Technology (KAIST), Daejeon 34141, Republic of Korea.
ACS applied materials & interfaces
|July 1, 2024
概括
相互连接的多孔金属有机框架 (MOF) 在固体复合电解质 (SCE) 中创建连续路径,提高离子导电性和电池性能. 这种设计克服了固态电池中孤立的MOF纳米填充剂的局限性.
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:
- 金属有机框架 (MOF) 为金属电池应用提供可调节的特性.
- 在固体复合电解质 (SCE) 中分散的MOF纳米填充剂可以阻碍离子运输,因为途径有限.
- 开发有效的纳米填充剂对于推进全固态电池至关重要.
研究的目的:
- 设计和引入一个连续的SCE纳米填充器与相互连接的多孔MOF (IMOF_SCE).
- 在SCE中增强离子导电性和离子运输通路.
- 提高金属电池的电化学性能和循环稳定性.
主要方法:
- 作为连续纳米填充剂,相互连接的多孔MOF (IMOF_SCE) 的制造.
- IMOF_SCE的离子导电性和离子转移数的表征.
- 使用IMOF_SCE组装Li/LiFePO4全电池,并评估电化学性能.
主要成果:
- IMOF_SCE在20°C时证明了离子导电率为6.72 × 10−5 S cm−1.
- 使用IMOF_SCE.实现了一个高的离子转移数 (tLi = 0.855).
- 具有IMOF_SCE的Li/LiFePO4全电池在300个循环中表现出98.8%的容量保留.
结论:
- 连续的,相互连接的MOF纳米填充器有效地在SCE中提供离子运输通路.
- IMOF_SCE显著提高了金属电池的离子导电性和电化学性能.
- 这种设计策略为开发用于储能应用的先进多孔材料纳米填充剂提供了一条途径.
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