广东工业大学施志聪团队报道了工作在20 mA cm^-2和20 mAh cm^-2条件下的催化化学中人工固体电解质界面稳定金属锂电极。相关研究成果于2023年6月7日发表在《德国应用化学》。

稳定的固体电解质界面层（SEI）对于锂金属阳极（LMA）在长期循环中的生存至关重要。然而，天然SEI的混沌结构和化学不均匀性使LMA遭受了令人恼火的枝晶生长和严重的电极粉碎，阻碍了LMA的实际应用。

该文中，研究人员设计了一种具有有序聚酰胺（PA）-LiOH（PA-LiOH）双相结构的催化剂衍生的人工SEI层，以调节离子传输并实现无枝晶的Li沉积。PA LiOH层可以基本上抑制LMA在循环Li电镀/剥离期间的体积变化，以及LMA与电解质之间的寄生反应。优化的LMA在Li||Li对称电池中在20mA[[EQUATION]] 的超高电流密度下，进行1000小时以上的循环Li电镀/剥离测试中表现出优异的稳定性。即使在1mA cm^-2的电流密度和1mAh cm^-2的容量下进行500次循环后，在无添加剂电解质的Li半电池中也实现了高达99.2%的高库仑效率。

附：英文原文

Title: Catalytic Chemistry Derived Artificial Solid Electrolyte Interphase for Stable Lithium Metal Anodes Working at 20 mA cm-2 and 20 mAh cm-2

Author: Yifeng Cheng, Zhijie Wang, Jinbiao Chen, Yuanmao Chen, Xi Ke, Duojie Wu, Qing Zhang, Yuanmin Zhu, Xuming Yang, Meng Gu, Zaiping Guo, Zhicong Shi

Issue&Volume: 2023-06-07

Abstract: A stable solid electrolyte interphase (SEI) layer is crucial for lithium metal anode (LMA) to survive in long-term cycling. However, chaotic structures and chemical inhomogeneity of natural SEI make LMA suffer from exasperating dendrite growth and severe electrode pulverization, hindering the practical application of LMAs. Here, we design a catalyst-derived artificial SEI layer with an ordered polyamide (PA)-LiOH (PA-LiOH) bi-phase structure to modulate ion transport and enable dendrite-free Li deposition. The PA-LiOH layer can substantially suppress the volume changes of LMA during cyclic Li plating/stripping, as well as the parasitic reactions between LMA and electrolyte. The optimized LMAs demonstrate excellent stability in cyclic Li plating/stripping tests for over 1000 hours at an ultra-high current density of 20 mA [[EQUATION]] in Li||Li symmetric cells. A high coulombic efficiency up to 99.2% in Li half cells under additive-free electrolyte is achieved even after 500 cycles at a current density of 1mA cm-2 with a capacity of 1 mAh cm-2.

DOI: 10.1002/anie.202305723

Source: https://onlinelibrary.wiley.com/doi/10.1002/anie.202305723