Publication date: 15th December 2025
Potassium metal batteries (PMBs) hold great promise for next-generation, sustainable batteries due to economic advantages including the cost-effectiveness of K sources and the elimination of critical elements (e.g., Li, Co, Ni) and (electro)chemical advantages including the low redox potential of K+/K, the faster K+ transport in electrolytes, and the lower desolvation energy at the electrode/electrolyte interface. The challenge to develop PMBs largely comes from K metal anodes – K dendrite growth and unstable solid-electrolyte interphase (SEI) during repetitive plating/stripping cycles, which can cause rapid performance degradation and safety issues. In this talk, I will first talk about the crucial role of lab approaches of processing K metal anodes, reflected by the optimization of the K metal surface properties through K processing methods and how they amplify the benefits of a robust SEI via tuning the electrolyte concentration. I will then discuss another investigation to improve K plating/stripping - creating surface nanotexture on substrates. This is guided by considering the work of adhesion (Wadh) at the K/substrate interface, and we propose this thermodynamic term as a proper descriptor for designing K plating/stripping substrates. Finally, I will show that our investigations enable energy dense PMBs (coin cells) by pairing K metal anodes with high-loading cathodes.
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