1. In situ healing of dendrites in a potassium metal battery.
- Author
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Hundekar, Prateek, Basu, Swastik, Xiulin Fan, Lu Li, Yoshimura, Anthony, Gupta, Tushar, Sarbada, Varun, Lakhnot, Aniruddha, Jain, Rishabh, Narayanan, Shankar, Shi, Yunfeng, Chunsheng Wang, and Koratkar, Nikhil
- Subjects
DENDRITES ,POTASSIUM ,COBALT oxides ,ELECTRIC batteries ,METALS - Abstract
The use of potassium (K) metal anodes could result in highperformance K-ion batteries that offer a sustainable and low-cost alternative to lithium (Li)-ion technology. However, formation of dendrites on such K-metal surfaces is inevitable, which prevents their utilization. Here, we report that K dendrites can be healed in situ in a K-metal battery. The healing is triggered by currentcontrolled, self-heating at the electrolyte/dendrite interface, which causes migration of surface atoms away from the dendrite tips, thereby smoothening the dendritic surface. We discover that this process is strikingly more efficient for K as compared to Limetal.We show that the reason for this is the far greater mobility of surface atoms in K relative to Li metal, which enables dendrite healing to take place at an order-of-magnitude lower current density. We demonstrate that the K-metal anode can be coupled with a potassium cobalt oxide cathode to achieve dendrite healing in a practical full-cell device. [ABSTRACT FROM AUTHOR]
- Published
- 2020
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