Ultrathin K–C Composite Anode Enables Conformal Stripping/Plating for Dendrite-Free and High-Rate Potassium-Metal Batteries

作者：Zixing Wang, Jian‐Fang Wu, Wang Zhou, Ying Mo, Shi Chen, Tongyu Zhou, Wenzhuo Shen, Bohua Ren, Peifeng Huang, Jilei Liu · 发表于：ACS Energy Letters · 年份：2024 · DOI：10.1021/acsenergylett.4c01982 · 被引用次数：28 · 研究领域：Advancements in Battery Materials、Advanced Battery Materials and Technologies、Advanced battery technologies research

The development of metallic K is seriously hampered by low melting point, high reactivity, and uncontrollable dendrite growth. Herein, benefiting from the super-potassiophility of CNTs (carbon nanotubes), K@CNT composite anodes are prepared via a rational fused-modeling approach, where CNTs build interconnected frameworks and K atoms are anchored on CNTs, inducing depressed atomic creeping and flowability at high temperatures. Thereby, K@CNT composite anodes deliver flexibility, processability (∼30 μm), and thermal stability (up to 300 °C). In particular, K@CNT composite anodes exhibit a conformal stripping and plating behavior along with the plane-structure of the CNT framework during charge–discharge processes under 10 mA cm –2 without dendrites. Moreover, the K@CNT // Prussian white full cells exhibit high rate performance (60.9 mAh g –1 at 3000 mA g –1 ), high energy density (187.3 Wh kg –1 ), and high-temperature stability. This work provides an avenue for designing high-performance metallic K anodes and for driving the commercialization of K-metal batteries.