期刊
APPLIED SURFACE SCIENCE
卷 573, 期 -, 页码 -出版社
ELSEVIER
DOI: 10.1016/j.apsusc.2021.151489
关键词
ZIF-67; PEO; Solid composite electrolyte; All solid state lithium ion battery
类别
资金
- National Natural Science Foundation of China [51502318, 41606096]
- Henan Institute of Science and Technology [2016034]
- Key Scientific and Technological Project of Henan Province [212102210234]
Composite polymer electrolyte (SCE) shows high ionic conductivity and good interfacial compatibility with lithium for all solid state lithium ion batteries (ASSLIBs); by incorporating ZIF-67 framework material into PEO matrix, the optimized SCE demonstrates excellent performances and stability.
Composite polymer electrolyte is a promising solid electrolyte for all solid state lithium ion batteries (ASSLIBs) due to its reliable safety, high ionic conductivity and excellent flexibility. Here, the uniform rhomboid dodecahedron structured zeolitic imidazolate framework-67 (ZIF-67) with high specific surface area and abundant nano-pores have been prepared by adjusting the synthetic solvent, which are subsequently incorporated into poly (ethylene oxide) (PEO) matrixes to form solid composite electrolyte (SCE). ZIF-67 MOFs can reduce the crystallinity of PEO matrixes, coordinate with C-O-C bonds of PEO and improve the mechanical properties of solid electrolyte. Additionally, abundant pore structure of ZIF-67 can endow its ability to absorb anions. The optimized SCE shows high ionic conductivities of 1.51 x 10(-5) S/cm at 25 degrees C, wide electrochemical stable window of around 5.2 V and good interfacial compatibility with lithium. Furthermore, LiFePO4/Li ASSLIB exhibits high electrochemical performances. At current rates of 0.2 C, 0.5 C, 1 C and 2 C, the battery has specific discharging capacities of 155.13, 153.77, 148.83 and 139.90 mAh.g(-1), respectively, and it demonstrates high capacity retention of 90.17% after 100 cycles at 0.5 C. Therefore, it is concluded that ZIF-67/PEO SCE is a good solid electrolyte candidate for ASSLIB.
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