期刊
JOURNAL OF MATERIALS SCIENCE
卷 56, 期 9, 页码 5868-5877出版社
SPRINGER
DOI: 10.1007/s10853-020-05559-6
关键词
-
资金
- National Natural Science Foundation of China [21802036]
- Science and Technology Department of Hubei Province [2018CFB110, 2020CFB404]
This study prepared MOF/PAN composite fibrous separators with excellent performance for high-rate Li-ion batteries, improving the ion transport capacity and long-term cycle stability. The potential applications of MOF/PAN composite separators are promising in the development of high-rate lithium-ion batteries.
In this study, metal-organic frameworks (MOF)/polyacrylonitrile (PAN) composite fibrous separators were prepared for high-rate Li-ion batteries by anchoring MOF into PAN nanofibrous network. The MOF/PAN separators possess excellent dimensional, thermal stability, intrinsically high porosity, and good electrolyte adsorption, which contribute excellent Li-ion transport capacity. The Li/Li symmetric cells assembled with MOF/PAN separators demonstrate improved coulombic efficiency, inhibition of Li dendrites, and excellent long-term cycle stability with low-voltage hysteresis of around 46 mV after more than 1200 h Li plating/stripping process, in comparison with around 350 mV after 360 h for commercialized Celgard 2400 separator. The excellent ionic transport capacity reveals impressive performance of the LiFePO4-MOF/PAN-Li metal full cells under high rate and the capacity that could be up to 104 mAh g(-1) at 5 C after 2000 cycles with a coulombic efficiency of almost 100%. This work provides a new prospect for the development of high-rate lithium-ion batteries.
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