摘要
Development of low-cost electrode materials with long cycle life and high volumetric capacity is im-portant for large-scale applications of lithium-ion batteries(LIBs).Here,an electrode made from Fe_(2)O_(3) encapsulated with N-doped carbon(Fe_(2)O_(3)@N-C)via ZIF-8 coating and carbonization process is reported.A cavity was generated between the Fe_(2)O_(3)and N-C material during the carbonization process that is conducive to alleviating the volume expansion of Fe_(2)O_(3).As a result,the Fe_(2)O_(3)@N-C composite exhibits a high specific capacity(1064 mAh/g at 0.1 A/g)and cycle stability(803.6 mAh/g at 1.0 A/g after 1100 cycles)when used as the LIB anode.In addition,the influence of carbonization under air on the LIB per-formance was investigated by controllably changing the crystal phase of Fe_(2)O_(3)and the thickness of the carbon layer.This work provides a new method for the design and fabrication of yolk-shell composite electrodes for LIBs and other applications.
基金
the Program of Introducing Talents of Discipline to Universities (No.B18030)
the National Natural Science Foundation of China (Nos.91856124 and 21531005)
the Natural Science Foundation of Tianjin City (No.19JCZDJC37200)
the National Postdoctoral Program for Innovative Talents (No.BX20190157)
the Postdoctoral Research Foundation of China (No.2019M660979)。
