Feng Deshi, Zheng Ruiling, Qiao Li, Li Shiteng, Xu Fengzhao, Ye Chuangen, Zhang Jing, Li Yong
Advanced Materials Institute, School of Materials Science and Technology, Qilu University of Technology (Shandong Academy of Sciences), Jinan 250014, China.
Department of Digital Media and Animation, Shandong Communication & Media College, Jinan 250200, China.
Polymers (Basel). 2024 Jul 5;16(13):1924. doi: 10.3390/polym16131924.
Developing a reasonable design of a lithiophilic artificial solid electrolyte interphase (SEI) to induce the uniform deposition of Li ions and improve the Coulombic efficiency and energy density of batteries is a key task for the development of high-performance lithium metal anodes. Herein, a high-performance separator for lithium metal anodes was designed by the in situ growth of a metal-organic framework (MOF)-derived transition metal sulfide array as an artificial SEI on polypropylene separators (denoted as CoS-PP). The high ionic conductivity and excellent morphology provided a convenient transport path and fast charge transfer kinetics for lithium ions. The experimental data illustrate that, compared with commercial polypropylene separators, the Li//Cu half-cell with a CoS-PP separator can be cycled stably for 2000 h at 1 mA cm and 1 mAh cm. Meanwhile, a Li//LiFePO full cell with a CoS-PP separator exhibits ultra-long cycle stability at 0.2 C with an initial capacity of 148 mAh g and maintains 74% capacity after 1000 cycles. This work provides some new strategies for using transition metal sulfides to induce the uniform deposition of lithium ions to create high-performance lithium metal batteries.
设计一种合理的亲锂人工固体电解质界面（SEI），以诱导锂离子均匀沉积，并提高电池的库仑效率和能量密度，是高性能锂金属负极发展的关键任务。在此，通过在聚丙烯隔膜上原位生长金属有机框架（MOF）衍生的过渡金属硫化物阵列作为人工SEI，设计了一种用于锂金属负极的高性能隔膜（表示为CoS-PP）。高离子电导率和优异的形貌为锂离子提供了便捷的传输路径和快速的电荷转移动力学。实验数据表明，与商用聚丙烯隔膜相比，具有CoS-PP隔膜的Li//Cu半电池在1 mA cm和1 mAh cm下可稳定循环2000 h。同时，具有CoS-PP隔膜的Li//LiFePO全电池在0.2 C下表现出超长的循环稳定性，初始容量为148 mAh g，在1000次循环后保持74%的容量。这项工作为利用过渡金属硫化物诱导锂离子均匀沉积以制造高性能锂金属电池提供了一些新策略。
