Enabling Superior Electrochemical Properties for Highly Efficient Potassium Storage via Impregnating Ultrafine Sb Nanocrystals within Nanochannel-Containing Carbon Nanofibers.

作者：Xufang Ge, Shu-Hu Liu, Man Qiao, Yi-Chen Du, Yafei Li, J. Bao, Xiao-Si Zhou · 发表于：Angewandte Chemie · 年份：2019 · DOI：10.1002/anie.201908918 · 被引用次数：348 · 研究领域：Medicine、Materials Science

Antimony (Sb)-based nanocomposites have emerged as an attractive class of anode materials for batteries as they exhibit large theoretical capacity and impressive working voltage. However, the tardy potassium ion diffusion characteristic, unstable Sb/electrolyte interphase, and huge volume variation pose a grand challenge that hinder the practical use of Sb-based anodes for potassium-ion batteries (PIBs). Herein, we report a simple yet robust strategy for uniformly impregnating ultrasmall Sb nanocrystals within carbon nanofibers containing an array of hollow nanochannels (denoted u-Sb@CNFs) that resolve the issues noted above, yielding high-performance PIBs. Remarkably, u-Sb@CNFs can be directly employed as anode, thereby dispensing with the need for conductive additives and binders. Such judiciously crafted u-Sb@CNF-based anode renders a set of intriguing electrochemical properties, representing large charge capacity, unprecedented cycling stability, and outstanding rate performance. Notably, a reversible capacity of 225 mAh g-1 is retained after 2000 cycles at 1 A g-1.