期刊
NANO RESEARCH
卷 13, 期 8, 页码 2259-2267出版社
TSINGHUA UNIV PRESS
DOI: 10.1007/s12274-020-2845-2
关键词
zeolitic imidazolate framework; inorganic fillers; solid polymer electrolytes; poly(ethyleneoxide); solid-state lithium metal batteries
类别
资金
- Key-Area Research and Development Program of Guangdong Province [2020B090919001, 2019B090908001]
- Natural Science Foundation of Guangdong Province [2019A1515010595]
- China Postdoctoral Science Foundation [2018M640778]
- International Cooperative Research Program of Shenzhen [GJHZ20180411143536149]
- Shenzhen Key Laboratory of Solid State Batteries [ZDSYS201802081843465]
- Guangdong Provincial Key Laboratory of Energy Materials for Electric Power [2018B030322001]
The incorporation of inorganic fillers into poly(ethyleneoxide)(PEO)-based solid polymer electrolytes (SPEs) is well known as a low-cost and effective method to improve their mechanical and electrochemical properties. Porous zeolitic imidazolate framework-8 (ZIF-8) is firstly used as the filler for PEO-based SPEs in this work. Due to the introduction of ZIF-8, an ionic conductivity of 2.2 x 10(-5) S/cm (30 degrees C) is achieved for the composite SPE, which is one order of magnitude higher than that of the pure PEO. ZIF-8 also accounts for the broader electrochemical stability window and lithium ion transference number (0.36 at 60 degrees C) of the composite SPE. Moreover, the improved mechanism of ZIF-8 to the composite SPE is investigated by zeta potential and Fourier transform infrared spectrograph characterizations. The stability at the composite SPE/lithium interface is greatly enhanced. The LiFePO4 parallel to Li cells using the composite SPE exhibit high capacity and excellent cycling performance at 60 degrees C, i.e., 85% capacity retention with 111 mA.h/g capacity retained after 350 cycles at 0.5 C. In comparison, the cells using the pure PEO show fast capacity decay to 74 mA.h/g maintaining only 68 capacity. These results indicate that the PEO-based SPEs with ZIF-8 are of great promise for the application in solid-state lithium metal batteries.
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