期刊
ISCIENCE
卷 23, 期 1, 页码 -出版社
CELL PRESS
DOI: 10.1016/j.isci.2019.100781
关键词
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资金
- Fundamental Research Funds for the Central Universities [531107051077, 531107051230, 531107051042]
- National Natural Science Foundation of China [21805079, 21805078]
- Hunan high-level talent gathering project [2018RS3054]
The creation of Li metal anodes while minimizing dendrite growth is an important challenge for developing high-energy density batteries. Dendrites can originate from an inhomogeneous charge distribution or an irregular substrate, and often, the way to suppress dendrite growth is to avoid their formation altogether (ion-uniform mechanism over a shelf time). Herein, we propose a different route to eliminate dendrite formation, called an asymmetrical bidirectional current mode (ABCM) of charging, leading to a healable Li metal anode and resulting in a positive feedback cycle. This mode allows for a stable cyclic performance and suppresses dendrite formation effectively (while holding the polarization similar to 27 mV for over 1,000 h), and provides a better result than suppressing Li dendrites via weakening of the Li dendrite (ion-uniform mechanism). These results indicate that ABCM may be a promising way to stabilize the Li anode of Li metal batteries, without any chemical/physical modification of the anode.
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