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A Core‐Shell NiFe 2 O 4 @SiO 2 Structure as a High‐Performance Anode Material for Lithium‐Ion Batteries
Author(s) -
Qin Getong,
Wu Xin,
Wen Jianwu,
Li Jing,
Zeng Min
Publication year - 2019
Publication title -
chemelectrochem
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.182
H-Index - 59
ISSN - 2196-0216
DOI - 10.1002/celc.201801839
Subject(s) - materials science , anode , coating , amorphous solid , electrolyte , lithium (medication) , chemical engineering , oxide , layer (electronics) , carbon fibers , composite material , electrode , metallurgy , composite number , medicine , chemistry , organic chemistry , engineering , endocrinology
Smart surface coatings composed of transition‐metal oxides are shown to significantly improve the cycling performance of batteries. Currently, most studies are mainly focused on coating materials such as TiO 2 and carbon‐based materials. However, these coating materials face significant challenges, including their low capacity and tedious processing. Herein, a simple and novel amorphous SiO 2 coating is successfully used on the surface of NiFe 2 O 4 to form a core‐shell structure. When tested as an anode, it delivers a high initial discharge capacity of 2022.3 mAh g −1 and retains a high specific capacity of 1224.6 mAh g −1 after 100 cycles at a current density of 0.1 C. The superior performance of NiFe 2 O 4 @SiO 2 is mainly attributed to the SiO 2 coatings, which can provide a high capacity, alleviate drastic volume changes in NiFe 2 O 4 and form a stable solid electrolyte interphase (SEI) layer. The results demonstrated that SiO 2 can be used as a novel coating material to improve the cycling properties of metal oxide materials.