Surface/Interface Effects on High-Performance Thin-Film All-Solid-State Li-Ion Batteries

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• 作者：Chen Gong ; Dmitry Ruzmetov ; Alexander Pearse ; Dakang Ma ; Jeremy N. Munday ; Gary Rubloff ; A. Alec Talin ; Marina S. Leite
• 刊名：ACS Applied Materials & Interfaces
• 出版年：2015
• 出版时间：December 2, 2015
• 年：2015
• 卷：7
• 期：47
• 页码：26007-26011
• 全文大小：412K
• ISSN：1944-8252

文摘

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鈥揕i鈥揙 alloy formed at the stress-free surface of the electrode causes rapid capacity fade, from 48.0 to 41.5 渭Ah/cm² 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%.