阳极
材料科学
复合数
箔法
化学工程
热解炭
图层(电子)
吸附
金属
锌
阴极
纳米技术
电极
复合材料
冶金
有机化学
热解
工程类
物理化学
化学
作者
Quanyu Li,Han Wang,Huaming Yu,Meng Fu,Wen Liu,Qiwen Zhao,Shaozhen Huang,Liangjun Zhou,Weifeng Wei,Xiaobo Ji,Yuejiao Chen,Yuejiao Chen
标识
DOI:10.1002/adfm.202303466
摘要
Abstract The Zn metal anode is subject to uncontrolled dendrites and parasitic reactions, which often require a big thickness of Zn foil, resulting in excess capacity and extremely low utilization. Here, an ultrathin Zn composite anode (24 µm) is developed with a protective hydrophobic layer (covalent (C 2 F 4 ) n chains and F‐doped carbonized ingredient) constructed on Cu foil (denoted as (C 2 F 4 ) n ‐C@Cu) as a host by one‐step pyrolytic evaporation deposition. The repulsion of (C 2 F 4 ) n to Zn 2+ makes the (C 2 F 4 ) n ‐C@Cu interface possess enhanced adsorption ability, driving more charge transfer under the layer. With its good hydrophobicity, this layer prevents H 2 O from damaging the plated Zn. Combined with the semi‐ionic‐state fluorine as zincophilic site, the host guides uniform and dense Zn deposition for making ultrathin Zn anode. As a result, the (C 2 F 4 ) n ‐C@Cu electrode exhibits high average CE of 99.6% over 3000 cycles at 2 mA cm −2 . Benchmarked against the commercial 20µm‐Zn foil, the (C 2 F 4 ) n ‐C@Cu@Zn anode achieves enhanced stability (1200 h at 1 mA cm −2 ), only 100 h for the 20µm‐Zn foil. When paired with V 2 O 5 cathode, the Zn composite anode makes the full cell deliver 88% retention for 2500 cycles.
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