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Engineering an Ultrathin and Hydrophobic Composite Zinc Anode with 24 µm Thickness for High-Performance Zn Batteries
Advanced Functional Materials ( IF 18.5 ) Pub Date : 2023-06-05 , DOI: 10.1002/adfm.202303466 Quanyu Li 1 , Han Wang 1 , Huaming Yu 1 , Meng Fu 1 , Wen Liu 1 , Qiwen Zhao 1 , Shaozhen Huang 1 , Liangjun Zhou 1 , Weifeng Wei 1 , Xiaobo Ji 2 , Yuejiao Chen 1 , Libao Chen 1
Advanced Functional Materials ( IF 18.5 ) Pub Date : 2023-06-05 , DOI: 10.1002/adfm.202303466 Quanyu Li 1 , Han Wang 1 , Huaming Yu 1 , Meng Fu 1 , Wen Liu 1 , Qiwen Zhao 1 , Shaozhen Huang 1 , Liangjun Zhou 1 , Weifeng Wei 1 , Xiaobo Ji 2 , Yuejiao Chen 1 , Libao Chen 1
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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 (C2F4)n chains and F-doped carbonized ingredient) constructed on Cu foil (denoted as (C2F4)n-C@Cu) as a host by one-step pyrolytic evaporation deposition. The repulsion of (C2F4)n to Zn2+ makes the (C2F4)n-C@Cu interface possess enhanced adsorption ability, driving more charge transfer under the layer. With its good hydrophobicity, this layer prevents H2O 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 (C2F4)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 (C2F4)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 V2O5 cathode, the Zn composite anode makes the full cell deliver 88% retention for 2500 cycles.
中文翻译：
为高性能锌电池设计厚度为 24 µm 的超薄疏水复合锌阳极
锌金属阳极容易产生不受控制的枝晶和寄生反应，这通常需要大厚度的锌箔，导致容量过剩和利用率极低。这里，开发了一种超薄锌复合阳极（24 µm），其在铜箔（表示为（ C 2 F 4）n - C@Cu)作为主体，通过一步热解蒸发沉积。(C 2 F 4 ) n对 Zn 2+的排斥使得 (C 2 F 4 ) n-C@Cu界面具有增强的吸附能力，驱动层下更多的电荷转移。该层具有良好的疏水性，可防止 H 2 O 损坏镀层 Zn。结合半离子态氟作为亲锌位点，主体引导均匀致密的锌沉积，用于制造超薄锌负极。结果，(C 2 F 4 ) n -C@Cu电极在2 mA cm -2下经过3000次循环后表现出99.6%的高平均CE 。以商业20μm-Zn箔为基准，(C 2 F 4 ) n -C@Cu@Zn阳极实现了增强的稳定性（1 mA cm -2下1200小时），而20μm-Zn箔仅100小时。与V配对时2 O 5阴极，锌复合阳极使全电池在2500次循环中保持88%的保留率。
更新日期：2023-06-05
中文翻译：
为高性能锌电池设计厚度为 24 µm 的超薄疏水复合锌阳极
锌金属阳极容易产生不受控制的枝晶和寄生反应，这通常需要大厚度的锌箔，导致容量过剩和利用率极低。这里，开发了一种超薄锌复合阳极（24 µm），其在铜箔（表示为（ C 2 F 4）n - C@Cu)作为主体，通过一步热解蒸发沉积。(C 2 F 4 ) n对 Zn 2+的排斥使得 (C 2 F 4 ) n-C@Cu界面具有增强的吸附能力，驱动层下更多的电荷转移。该层具有良好的疏水性，可防止 H 2 O 损坏镀层 Zn。结合半离子态氟作为亲锌位点，主体引导均匀致密的锌沉积，用于制造超薄锌负极。结果，(C 2 F 4 ) n -C@Cu电极在2 mA cm -2下经过3000次循环后表现出99.6%的高平均CE 。以商业20μm-Zn箔为基准，(C 2 F 4 ) n -C@Cu@Zn阳极实现了增强的稳定性（1 mA cm -2下1200小时），而20μm-Zn箔仅100小时。与V配对时2 O 5阴极，锌复合阳极使全电池在2500次循环中保持88%的保留率。
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