Issue 34, 2023

A host potassiophilicity strategy for unprecedentedly stable and safe K metal batteries

Abstract

Creating high-performance host materials for potassium (K) metal anodes remains a significant challenge due to the complex preparation process and poor K reversibility. In our work, we developed a potassiophilicity strategy using an oxygen-modified carbon cloth (O-CC) network as a host for K metal anodes. The O-CC network exhibited superior potassiophilic ability, and this improvement was also observed in other carbon hosts using the same process. The oxygen-induced epoxy group in the carbon network regulates interface electrons and enables strong binding of K adatoms through orbital hybridization, resulting in fewer side reactions with the electrolyte and promoting K-ion desolvation and uniform deposition. These factors result in unprecedented stability of the carbon network host, with a long lifespan of over 5500 hours at 0.5 mA cm−2/0.5 mA h cm−2 and 3500 h at 1 mA cm−2/0.5 mA h cm−2 in symmetric cells for K metal anodes, surpassing the cycle life of all previously reported K metal anodes. Furthermore, a high average coulombic efficiency of over 99.3% is demonstrated in O-CC//K cells during 210 cycles. The O-CC also exhibited a stable electrochemical performance, with a capacity retention of 73.3% in full cells coupled with a perylene-3,4,9,10-tetracarboxylic dianhydride cathode. We believe that this new strategy holds great promise for metal anodes in battery applications.

Graphical abstract: A host potassiophilicity strategy for unprecedentedly stable and safe K metal batteries

Supplementary files

Article information

Article type
Edge Article
Submitted
24 jún 2023
Accepted
04 aug 2023
First published
06 aug 2023
This article is Open Access

All publication charges for this article have been paid for by the Royal Society of Chemistry
Creative Commons BY-NC license

Chem. Sci., 2023,14, 9114-9122

A host potassiophilicity strategy for unprecedentedly stable and safe K metal batteries

Z. Li, L. Ma, K. Han, Y. Ji, J. Xie, L. Pan, J. Li and W. Mai, Chem. Sci., 2023, 14, 9114 DOI: 10.1039/D3SC03203E

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