期刊
ACS APPLIED MATERIALS & INTERFACES
卷 7, 期 47, 页码 26007-26011出版社
AMER CHEMICAL SOC
DOI: 10.1021/acsami.5b07058
关键词
energy storage; all-solid-state batteries; thin-films; aluminum; silicon
资金
- School of Engineering at the University of Maryland
- Minta Martin Award
- Laboratory Directed Research and Development Program at Sandia National Laboratories
- U.S. DOE National Nuclear Security Administration [DE-AC04-94AL85000]
- U.S. Department of Energy, Office of Science, and Office of Basic Energy Sciences [DESC0001160]
The further development of all-solid-state batteries is still limited by the understanding/engineering of the interfaces formed upon cycling. Here, we correlate the morphological, chemical, and electrical changes of the surface of thin-film devices with Al negative electrodes. The stable Al-Li-O alloy formed at the stress-free surface of the electrode causes rapid capacity fade, from 48.0 to 41.5 mu Ah/cm(2) in two cycles. Surprisingly, the addition of a Cu capping layer is insufficient to prevent the device degradation. Nevertheless, Si electrodes present extremely stable cycling, maintaining >92% of its capacity after 100 cycles, with average Coulombic efficiency of 98%.
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