阳极
材料科学
枝晶(数学)
电流密度
电化学
化学工程
氟化锂
纳米纤维
电池(电)
金属
复合材料
纳米技术
电极
化学
无机化学
冶金
物理化学
热力学
功率(物理)
工程类
物理
量子力学
数学
几何学
作者
Yifan Hu,Zichuang Li,Zongpeng Wang,Xunlu Wang,Wei Chen,Yuandong Wang,Wen‐De Zhong,Ruguang Ma
标识
DOI:10.1002/advs.202206995
摘要
Li metal anode is considered as one of the most desirable candidates for next-generation battery due to its lowest electrochemical potential and high theoretical capacity. However, undesirable dendrite growth severely exacerbates the interfacial stability, thus damaging battery performance and bringing safety concerns. Here, an efficient strategy is proposed to stabilize Li metal anode by digesting dendrites sprout using a 3D flexible superlithiophilic membrane consisting of poly(vinylidene fluoride) (PVDF) and ZnCl2 composite nanofibers (PZEM) as a protective layer. Both the experimental studies and theoretical calculations show the origin of superlithiophilicity ascribed to a strong interaction between ZnCl2 and PVDF to form the ZnF bonds. The multifield physics calculation implies effective removal of local dendrite hotspots by PZEM via a more homogeneous Li+ flux. The PZEM-covered Li anode (PZEM@Li) exhibits superior Li deposition/stripping performance in a symmetric cell over 1100 cycles at a high current density of 5 mA cm-2 . When paired with LiFePO4 (LFP), PZEM@Li|LFP full cell remains stable over 1000 cycles at 2 C with a degradation rate of 0.0083% per cycle. This work offers a new route for efficient protection of Li metal anode for practical applications.
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