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

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journal contribution
posted on 02.12.2015, 00:00 by Chen Gong, Dmitry Ruzmetov, Alexander Pearse, Dakang Ma, Jeremy N. Munday, Gary Rubloff, A. Alec Talin, Marina S. Leite
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 μAh/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%.