Qi Xinhong, Cai Dan, Wang Xiuli, Xia Xinhui, Gu Changdong, Tu Jiangping
State Key Laboratory of Silicon Materials, Key Laboratory of Advanced Materials and Applications for Batteries of Zhejiang Province, and School of Materials Science and Engineering, Zhejiang University, Hangzhou 310027, China.
ACS Appl Mater Interfaces. 2022 Feb 9;14(5):6859-6868. doi: 10.1021/acsami.1c23034. Epub 2022 Jan 26.
Metal-organic framework (MOF)-based solid-like electrolytes have attracted more prospective due to the combined merits of solid-state electrolytes and liquid electrolytes. However, most MOF-based solid-like electrolytes using organic liquid electrolytes cannot fundamentally solve the safety issues of lithium-metal batteries, and the ionic conductivity and mechanical strength of the electrolytes should be further enhanced. Herein, the ionic liquid-impregnated polypropylene (PP) porous membrane with integrally distributed ZIF-8 nanoparticles is designed. The solid-like electrolyte possesses an increased ionic conductivity of 2.09 × 10 S cm at 25 °C, lithium-ion transference number (0.45), mechanical strength, electrochemical window, and excellent nanowetted interfaces. Furthermore, the Li symmetrical cell shows excellent Li plating/stripping properties for 550 h at 0.1 mA cm and 0.1 mA h cm. The LiFePO/Li full battery with the solid-like electrolyte demonstrates an excellent rate capability and cycling stability with the initial discharge capacity of 157.9 mA h g and a capacity retention ratio of 91.23% after 450 cycles at 0.2 C. The work offers a new avenue toward MOF-based solid-like electrolytes for high-safety lithium-metal batteries.
基于金属有机框架（MOF）的类固态电解质因其兼具固态电解质和液体电解质的优点而备受关注。然而，大多数使用有机液体电解质的基于MOF的类固态电解质并不能从根本上解决锂金属电池的安全问题，电解质的离子电导率和机械强度仍有待进一步提高。在此，设计了一种具有整体分布的ZIF-8纳米颗粒的离子液体浸渍聚丙烯（PP）多孔膜。该类固态电解质在25℃下具有2.09×10 S cm的提高的离子电导率、锂离子迁移数（0.45）、机械强度、电化学窗口以及优异的纳米浸润界面。此外，锂对称电池在0.1 mA cm和0.1 mA h cm下550 h内显示出优异的锂电镀/剥离性能。具有该类固态电解质的LiFePO/Li全电池表现出优异的倍率性能和循环稳定性，初始放电容量为157.9 mA h g，在0.2 C下450次循环后容量保持率为91.23%。这项工作为用于高安全性锂金属电池的基于MOF的类固态电解质开辟了一条新途径。
