过电位
材料科学
阳极
锂(药物)
铋
碳纤维
复合数
合金
纳米技术
复合材料
化学工程
冶金
电极
化学
电化学
物理化学
内分泌学
工程类
医学
作者
Zhaolin Na,Lin Li,Wenjing Li,Xinran Wang,Xudong Sun,Qingshuang Wang,Gang Huang
标识
DOI:10.1002/smtd.202301006
摘要
Abstract It is reported that self‐heating‐induced healing on lithium metal anodes (LMAs) provides a mitigation strategy for suppressing Li dendrites. However, how to boost the self‐heating‐induced healing of Li‐dendrites and incorporate it into Li‐host design remains an imminent problem that needs to be solved. Herein, a new bismuth nanosphere semi‐buried carbon cloth (Bi‐NS‐CC) material with a 3D flexible host structure is proposed. The ultrasmall Bi nanospheres are uniformly and densely distributed on carbon fiber, providing active sites to form uniform Li 3 Bi alloy with molten lithium, thereby guiding the injection of molten metallic lithium into the 3D structure to form a self‐supporting composite LMAs. The ingenious semi‐embedded structure with strong interfacial C─Bi ensures superior mechanical properties. Interestingly, when the current density reaches up to 10 mA cm −2 , the lithium dendrites undergo self‐heating. Carbon cloth as a host can quickly and uniformly transfer heat, which induces the uniform migration of Li on anodes. The semi‐embedded structure with strong C─Bi ensures Bi nanospheres guide the formation of smooth morphology even under these harsh conditions (high‐temperature, high‐rate, etc.). Consequently, at 10 mA cm −2 /10 mAh cm −2 , the Li/Li 3 Bi‐NS‐CC realizes ultra‐long cycles of 1500 h and ultra‐low overpotential of 15 mV in a symmetric cell.
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