Cheng Zengzhong, Chen Ya, Shi Lei, Wu Meifen, Wen Zhaoyin
CAS Key Laboratory of Materials for Energy Conversion, Shanghai Institute of Ceramics, Chinese Academy of Sciences, Shanghai 200050, P. R. China.
Center of Materials Science and Optoelectronics Engineering, University of Chinese Academy of Science, Beijing 100049, P. R. China.
ACS Appl Mater Interfaces. 2023 Mar 1;15(8):10585-10592. doi: 10.1021/acsami.2c18224. Epub 2023 Feb 21.
Lithium metal batteries based on metallic Li anodes have been recognized as competitive substitutes for current energy storage technologies due to their exceptional advantage in energy density. Nevertheless, their practical applications are greatly hindered by the safety concerns caused by lithium dendrites. Herein, we fabricate an artificial solid electrolyte interface (SEI) via a simple replacement reaction for the lithium anode (designated as LNA-Li) and demonstrate its effectiveness in suppressing the formation of lithium dendrites. The SEI is composed of LiF and nano-Ag. The former can facilitate the horizontal deposition of Li, while the latter can guide the uniform and dense lithium deposition. Benefiting from the synergetic effect of LiF and Ag, the LNA-Li anode exhibits excellent stability during long-term cycling. For example, the LNA-Li//LNA-Li symmetric cell can cycle stably for 1300 and 600 h at the current densities of 1 and 10 mA cm, respectively. Impressively, when matching with LiFePO, the full cells can steadily cycle for 1000 times without obvious capacity attenuation. In addition, the modified LNA-Li anode coupled with the NCM cathode also exhibits good cycling performance.
基于金属锂负极的锂金属电池因其在能量密度方面的卓越优势，已被公认为是当前储能技术具有竞争力的替代品。然而，锂枝晶引发的安全问题极大地阻碍了它们的实际应用。在此，我们通过一种简单的置换反应为锂负极制备了一种人工固体电解质界面（SEI）（命名为LNA-Li），并证明了其在抑制锂枝晶形成方面的有效性。该SEI由LiF和纳米银组成。前者可促进锂的水平沉积，而后者可引导锂均匀且致密地沉积。受益于LiF和Ag的协同效应，LNA-Li负极在长期循环过程中表现出优异的稳定性。例如，LNA-Li//LNA-Li对称电池在1和10 mA cm的电流密度下分别可稳定循环1300小时和600小时。令人印象深刻的是，当与LiFePO匹配时，全电池可稳定循环1000次而无明显容量衰减。此外，改性的LNA-Li负极与NCM正极耦合也表现出良好的循环性能。
