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首页> 外文期刊>Advanced energy materials >Coupling Low-Tortuosity Carbon Matrix with Single-Atom Chemistry Enables Dendrite-Free Potassium-Metal Anode
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Coupling Low-Tortuosity Carbon Matrix with Single-Atom Chemistry Enables Dendrite-Free Potassium-Metal Anode

机译：Coupling Low-Tortuosity Carbon Matrix with Single-Atom Chemistry Enables Dendrite-Free Potassium-Metal Anode

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摘要

Potassium metal is an ideal anode for potassium-metal batteries due to its lowelectrode potential and high theoretical capacity. Nevertheless, infinite volumechange, uncontrollable K dendrite growth, and unstable solid-electrolyte interfacesseverely restrain its practical viability. Inspired by the vertical channelsin natural wood, a spatial control strategy is proposed to address the abovechallenges using a low-tortuosity carbon matrix decorated with single-atomCo catalysts that act as K hosts (denoted as SA-Co@HC). The homogenouslysupported Co atoms on the nitrogen-doped carbon matrix reduce the nucleationenergy barrier and promote the deposition kinetics of K. Furthermore,the conductive low-tortuosity matrix can alter the electric field and allow fastK-ion transport in the vertical direction. More importantly, the SA-Co@HChost provides sufficient channel spaces to withstand the tremendous electrodevolume change upon cycling. Benefitting from the synergetic effects of theSA-Co@HC host, the symmetric cell using a SA-Co@HC/K composite electrodedemonstrates a dendrite-free potassium plating/striping behavior, as well asachieving superb cycling stability of more than 2500 h at 0.5 mA cm~(?2) in acarbonate-based electrolyte. The full cell coupled with potassium-free organiccathodes, the SA-Co@HC/K composite anode helps deliver excellent cycle andrate performances compared to the bare K anode.

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