Статья

In situ healing of dendrites in a potassium metal battery

Prateek HundekarDepartment of Mechanical, Aerospace and Nuclear Engineering, Rensselaer Polytechnic Institute, Troy, NY 12180;Swastik BasuDepartment of Mechanical, Aerospace and Nuclear Engineering, Rensselaer Polytechnic Institute, Troy, NY 12180;Xiulin FanDepartment of Chemical and Biomolecular Engineering, University of Maryland, College Park, MD 20742;Lu LiDepartment of Mechanical, Aerospace and Nuclear Engineering, Rensselaer Polytechnic Institute, Troy, NY 12180;Anthony YoshimuraDepartment of Physics, Applied Physics and Astronomy, Rensselaer Polytechnic Institute, Troy, NY 12180;Tushar GuptaDepartment of Mechanical, Aerospace and Nuclear Engineering, Rensselaer Polytechnic Institute, Troy, NY 12180;Varun SarbadaDepartment of Material Science and Engineering, Rensselaer Polytechnic Institute, Troy, NY 12180Aniruddha S. LakhnotDepartment of Mechanical, Aerospace and Nuclear Engineering, Rensselaer Polytechnic Institute, Troy, NY 12180;Rishabh JainDepartment of Mechanical, Aerospace and Nuclear Engineering, Rensselaer Polytechnic Institute, Troy, NY 12180;Shankar NarayananDepartment of Mechanical, Aerospace and Nuclear Engineering, Rensselaer Polytechnic Institute, Troy, NY 12180;Yunfeng ShiDepartment of Material Science and Engineering, Rensselaer Polytechnic Institute, Troy, NY 12180Chunsheng WangDepartment of Chemical and Biomolecular Engineering, University of Maryland, College Park, MD 20742;Nikhil KoratkarDepartment of Material Science and Engineering, Rensselaer Polytechnic Institute, Troy, NY 12180

2020en

ABI

Аннотация

The use of potassium (K) metal anodes could result in high-performance 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 current-controlled, 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 Li metal. 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.

Перевод пока недоступен

Идентификаторы

DOI: 10.1073/pnas.1915470117

Цитирования и источники

Цитирований: 2Использованных источников: 0

Показатели — AkademScholar