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Cu Foam-Loaded Cu2Mg Alloy with High Electrochemical Stability to Regulate the Nucleation of Lithium for Dendrite-Free Lithium Metal Batteries
ACS Sustainable Chemistry & Engineering ( IF 7.1 ) Pub Date : 2022-05-18 , DOI: 10.1021/acssuschemeng.2c01368 Yong Jiang 1 , Gaofeng Liu 1 , Jinlong Jiang 1 , Xiaofeng Hu 1 , Libing Hu 1 , Wenzhuo Li 1 , Xiaoyu Liu 2 , Bing Zhao 1, 2
ACS Sustainable Chemistry & Engineering ( IF 7.1 ) Pub Date : 2022-05-18 , DOI: 10.1021/acssuschemeng.2c01368 Yong Jiang 1 , Gaofeng Liu 1 , Jinlong Jiang 1 , Xiaofeng Hu 1 , Libing Hu 1 , Wenzhuo Li 1 , Xiaoyu Liu 2 , Bing Zhao 1, 2
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Constructing a lithiophilic layer-modified three-dimensional framework is an effective approach to solve the problems of dendrite growth and volume expansion during Li plating/stripping. Herein, a Cu2Mg alloy layer is constructed on copper foam (CF@Cu2Mg) using a facile thermal evaporation and in situ alloying process for the first time to obtain a highly lithiophilic and dendrite-free lithium metal anode. Density functional theory calculations show that Cu2Mg possesses a more negative adsorption energy (−1.96 eV) than pure Cu (−1.45 eV), implying a better lithiophilicity of Cu2Mg. Moreover, different from other Mg0-containing lithiophilic compounds, the Cu2Mg alloy possesses splendid chemical and electrochemical stability. The Li alloying reaction will not occur in the process of discharge, avoiding the failure of the modification layer. Therefore, a long cycling lifespan of 3500 h with an ultra-low deposition overpotential (∼9 mV) is achieved for the half-cell. The full cell with LiFePO4 as the cathode exhibits good cycling performance at 1 C with a capacity retention rate of 90% after 400 cycles. The construction of Cu2Mg coating in this work points to a new direction for the design of highly lithiophilic and electrochemically stable Mg-containing 3D hosts for dendrite-free lithium metal anodes.
中文翻译：
具有高电化学稳定性的 Cu 泡沫负载 Cu2Mg 合金调节无枝晶锂金属电池中锂的成核
构建亲锂层修饰的三维骨架是解决锂镀/脱锂过程中枝晶生长和体积膨胀问题的有效途径。在此，首次使用简便的热蒸发和原位合金化工艺在泡沫铜（CF@Cu 2 Mg）上构建Cu 2 Mg合金层，以获得高度亲锂且无枝晶的锂金属负极。密度泛函理论计算表明，Cu 2 Mg 具有比纯Cu（-1.45 eV）更大的负吸附能（-1.96 eV），表明Cu 2 Mg 具有更好的亲锂性。此外，与其他含 Mg 0的亲锂化合物不同，Cu 2镁合金具有优良的化学和电化学稳定性。放电过程中不会发生锂合金化反应，避免了改性层的失效。因此，半电池实现了 3500 小时的长循环寿命和超低的沉积过电位（~9 mV）。以LiFePO 4为正极的全电池在1 C下表现出良好的循环性能，400次循环后容量保持率为90%。本工作中 Cu 2 Mg 涂层的构建为设计用于无枝晶锂金属负极的高度亲锂且电化学稳定的含镁 3D 主体指明了新方向。
更新日期：2022-05-18
中文翻译：
具有高电化学稳定性的 Cu 泡沫负载 Cu2Mg 合金调节无枝晶锂金属电池中锂的成核
构建亲锂层修饰的三维骨架是解决锂镀/脱锂过程中枝晶生长和体积膨胀问题的有效途径。在此，首次使用简便的热蒸发和原位合金化工艺在泡沫铜（CF@Cu 2 Mg）上构建Cu 2 Mg合金层，以获得高度亲锂且无枝晶的锂金属负极。密度泛函理论计算表明，Cu 2 Mg 具有比纯Cu（-1.45 eV）更大的负吸附能（-1.96 eV），表明Cu 2 Mg 具有更好的亲锂性。此外，与其他含 Mg 0的亲锂化合物不同，Cu 2镁合金具有优良的化学和电化学稳定性。放电过程中不会发生锂合金化反应，避免了改性层的失效。因此，半电池实现了 3500 小时的长循环寿命和超低的沉积过电位（~9 mV）。以LiFePO 4为正极的全电池在1 C下表现出良好的循环性能，400次循环后容量保持率为90%。本工作中 Cu 2 Mg 涂层的构建为设计用于无枝晶锂金属负极的高度亲锂且电化学稳定的含镁 3D 主体指明了新方向。
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