Potassium (K) metal battery (KMB) anodes have attracted significant attention in the energy storage field due to their high theoretical energy density. Unfortunately, developing high-performance KMB anodes remains a considerable challenge due to dendrite growth. Inspired by the protective and regulating functions of the skin's sebum barrier, we designed a biomimetic polydimethylsiloxane (PDMS)-based protective interface as a barrier for the K metal interface. Based on theory calculations and experimental validation, the PDMS interface consistently and effectively shields K metal from interfacial side reactions. Simultaneously, it facilitates the formation of a more robust solid electrolyte interphase layer, thereby enhancing ion transport dynamics at the interface and improving the uniformity of K metal deposition. The symmetric cell of K@PDMS maintains stable cycling exceeding 2700 h at 0.5 mA cm-2/0.5 mAh cm-2. The excellent cycling stability of the K@PDMS//PTCDA full-cell results in superior electrochemical performance with 71% capacity retention after 500 cycles. This unique interfacial design offers a promising strategy for future KMB anode applications.
Li et al. (Wed,) studied this question.
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