Room-Temperature Solid-State Lithium Metal Batteries Using Metal Organic Framework Composited Comb-Like Methoxy Poly(ethylene glycol) Acrylate Solid Polymer Electrolytes

作者：Lei, Zhiwen; Qiu, Qi; Shen, Jinlai; Ao, Xiaohu; Zhang, Bingqi; Guo, Yuanfa; Wang, Jun^*; Deng, Yonghong^*; Wang, Chaoyang^*

来源：Macromolecular Materials and Engineering, 2021, 306(10): 2100336.

DOI：10.1002/mame.202100336

• lithium metal batteries
• metal organic frameworks
• solid polymer electrolytes
• zeolitic imidazolate framework-8

Solid polymer electrolyte with good thermal stability and flexibility is an excellent candidate for solid-state lithium metal batteries, while its low ionic conductivity caused by high crystallinity limits its application at ambient temperature. Here a metal organic framework (zeolitic imidazolate framework-8, ZIF-8) composited comb-like methoxy poly(ethylene glycol) acrylate polymer electrolyte (MCPE) with high ionic conductivity (9.96 x 10(-5) S cm(-1) at 30 degrees C) is prepared by an in situ UV polymerization method. The as-prepared MCPE exhibits improved mechanical property due to the introduction of porous ZIF-8 nanofillers, which is beneficial to suppress the growth of lithium dendrites. Consequently, the LiFePO4||MCPE||Li cells show a high capacity of 116 mAh g(-1) at 30 degrees C and 0.5 C, and maintain 89.4% of initial capacity after 150 cycles with the average Coulombic efficiency of 99.9%. These results demonstrate that the MCPE shows great potential in solid-state lithium metal batteries near room temperature.