Chai Yan, Gao Jiansheng, Yang Liangtao, Wu Wei, Ning De, Chen Zhongjun, Huang Wanxia, Zhang Gaoyuan, Gao Rui, Zhou Dong, Wang Jun, Huang Si-Min, Li Yongli
Institute for Clean Energy Technology, North China Electric Power University, Beijing, 102206, P. R. China.
Research Institute of Advanced Materials (Shenzhen) Co., Ltd, Shenzhen, 518017, P. R. China.
Small. 2025 Feb 5:e2412494. doi: 10.1002/smll.202412494.
The integration of metal organic frameworks (MOFs) and electrospun polymer fibers offers the potential to achieve uniform dispersion and high loading of fillers, providing a unique perspective for advancing composite solid electrolytes in solid-state lithium metal batteries. In this work, a composite solid electrolyte is fabricated through a combination of electrospinning and chemical immersion, facilitating the in situ nucleation and growth of HKUST-1 on polyacrylonitrile (PAN) electrospun nanofibers. The in situ coordinated HKUST-1 particles not only modify the solvation structure of Li and the coordination environment of TFSI, but also encapsulate PAN fibers to mitigate interfacial side reactions with lithium metal, thereby improving interfacial stability. Consequently, the solid-state electrolyte achieves a high Li ion transference number of 0.77 and an impressive critical current density of 4.5 mA cm. The assembled Li||Li symmetric cell exhibits stable operation for over 4000 h at 4.0 mA cm, while Li||LFP and Li||NCM811 cells demonstrate exceptional rate capability and cycling stability. This work provides valuable insights into the design and fabrication of MOF/polymer-based composite solid electrolytes.
