Preparation and Properties of ZIF-67 In-situ Loaded Cellulose Nanofibril-based Separator for Lithium-ion Batteries
In this study,cellulose nanofibril(CNF)was acetylated followed by in-situ loading of ZIF-67 and electrolyte impregnation to pre-pare a novel ZIF-67@acetylated cellulose nanofibril(ZIF-67@ACNF)separator for lithium-ion batteries.The effects of particle size of ZIF-67 on the structure and performance of the separator were systematically investigated.The results showed that as the particle size of ZIF-67 decreased from 0.46 μm(in ZIF-674@ACNF separator)to 0.25 μm(in the ZIF-678@ACNF separator),the porosity of the separator reduced from 74.2%to 52.1%,the ionic conductivity decreased from 0.75 mS/cm to 0.22 mS/cm,the interfacial resistance increased from 112.5 Ω to 1 115.7 Ω,the lithium-ion transference number declined from 0.41 to 0.31,and the electrochemical stability window went down from 5.1 V to 4.5 V.The initial capacity of assembled cell by ZIF-674@ACNF separator reached 159.6 mAh/g with a capacity reten-tion rate of 90%after 200 cycles at 0.5 C under room temperature.
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维普
