Highly stable lithium metal composite anode with a flexible 3D lithiophilic skeleton
Highly stable lithium metal composite anode with a flexible 3D lithiophilic skeleton
复制标题
DOI：
10.1016/j.nanoen.2022.107013
复制
发表时间：
2022-02
期刊：
影响因子：
17.6
通讯作者：
Xuzixu Cui;Jun Yang;Zhixin Xu;Qian Liu;Yanna Nuli;Jiulin Wang
中科院分区：
文献类型：
--
作者：
Xuzixu Cui;Jun Yang;Zhixin Xu;Qian Liu;Yanna Nuli;Jiulin Wang
金属锂由于其高比容量和低电化学电位而被认为是下一代储能装置的有前途的阳极。然而，其实际应用仍然受到固有的高活化，不受控制的枝晶生长和巨大的体积变化的阻碍。在这项工作中，一个高度稳定的锂金属复合阳极（LFMZ）与灵活的3D骨架的设计和制备通过锂颗粒，聚合物和ZnO之间的原位反应，以解决这些问题。所制备的Li+/电子混合导电三维骨架具有均匀分布的LiF，可以调节进入的Li+流量，并有效地防止电极与电解质的副反应。此外，增大的表面积降低了电流密度，并且形成的LiZn亲锂位点降低了Li沉积过电位。结果，实现了电极表面上的无枝晶Li沉积。由于其独特的结构和功能优势，复合电极显示出无枝晶形貌，循环过程中体积变化较小，与裸Li相比具有更好的电化学可逆性。此外，LFMZ/LiFePO 4和LFMZ/O2全电池提供稳定的循环和长寿命。这一工作为高能电池锂金属阳极的设计提供了新的思路。
Li metal is considered as the promising anode for next-generation energy storage devices owing to its ultrahigh specific capacity and lowest electrochemical potential. However, its practical applications are still hindered by inherent high activation, uncontrolled dendrite growth, and huge volume change. In this work, a highly stable Li metal composite anode (LFMZ) with a flexible 3D skeleton is designed and prepared via in-situ reactions among Li particles, polymers, and ZnO to address these problems. The produced Li+/electron hybrid conductive 3D skeleton with homogeneously distributed LiF could regulate the incoming Li+flux and effectively prevent the electrode from side reactions with electrolytes. In addition, the enlarged surface area declines the current density and formed LiZn lithiophilic sites reduce the Li deposition over-potential. As a result, dendrite-free Li deposition on the electrode surface is realized. Due to the unique structure and functional advantages, the composite electrode shows dendrite-free morphology, less volume change during cycling, and better electrochemical reversibility compared to bare Li. Moreover, the LFMZ/LiFePO4and LFMZ/O2full cells deliver stable cycling and a long lifetime. This work provides new insight into the design of Li metal anode for high energy batteries.