MOF-derived multifunctional filler reinforced polymer electrolyte for solid-state lithium batteries

• 作者: Zheng Zhang Ying Huang Heng Gao Chao Li Jiaxin Hang Panbo Liu
• 来源期刊: 能源化学
• 年，卷（期）: 2021,（9）
• 页码范围: 259-271
• 页数: 13页
• 语种: 英文

摘要

Solid-state lithium batteries(SSLBs)have attracted great interest from researchers due to their inherent high energy density and high safety performance.In order to develop SSLBs,the following two key prob-lems should be solved:(1)Improving the lithium ion conductivity of solid electrolyte at room tempera-ture;and(2)improving the interface between the electrode and the electrolyte.Herein,we propose a new multifunctional filler for reinforcing polymer electrolytes.The composite solid electrolytes(CSEs)mainly contain a MOF-derived Co-doped hollow porous carbon nanocage,which absorbs Li+ containing ionic liquid(Li-ILs@HPCN),polyethylene oxide(PEO)and lithium bis(trifluoromethanesulfonyl)imide.By optimizing the composition of the CSEs,the CSEs membrane with high ionic conductivity(1.91×10-4 S cm-1 at 30℃),wide electrochemical stability(5.2 V)and high mobility of lithium ion(0.5)was obtained.Even at a current density of 0.2 mA cm-2,the PILH electrolyte possesses excellent interfacial stability against Li metal in Li symmetrical batteries exceeds 1600 h.Finally,the SSLBs(LFP/PILH/Li)showed excellent cycle stability,and the capacity was maintained at 152.9 and 140.0 mA h g-1 after 150 cycles at a current density of 0.2C and 0.5C.This work proposes a completely new strategy for building high-performance SSLBs.