Nanostructured FeSn2/SnO2-based composites as high-performance anodes for lithium-ion batteries

被引:7
作者
Park, Jae-Wan [1 ]
Park, Cheol-Min [1 ]
机构
[1] Kumoh Natl Inst Technol, Sch Mat Sci & Engn, 61 Daehak Ro, Gumi 39177, Gyeongbuk, South Korea
基金
新加坡国家研究基金会;
关键词
Lithium-ion batteries; Anode materials; Disproportionated SnO; Reaction mechanism; FeSn2/SnO2; composites; ALLOY NEGATIVE ELECTRODES; ELECTROCHEMICAL PROPERTIES; HYDROGEN GENERATION; HIGH-CAPACITY; TIN OXIDE; LI; NANOCOMPOSITE; GRAPHENE; SNO2; KINETICS;
D O I
10.1016/j.jallcom.2019.06.280
中图分类号
O64 [物理化学(理论化学)、化学物理学];
学科分类号
070304 ; 081704 ;
摘要
A nanostructured FeSn2/SnO2 composite was directly synthesized using a simple solid-state ball milling synthesis method by exploiting the disproportionation reaction of SnO and the thermodynamically stable formation of FeSn2. The as-synthesized FeSn2/SnO2 composite comprised small (similar to 10-20 nm) FeSn2 and SnO2 nanocrystallites, and as a lithium-ion battery anode, it exhibited better electrochemical performance than FeSn2 and SnO2. Furthermore, we prepared a C-decorated FeSn2/SnO2 (FeSn2/SnO2/C) composite. Compared to FeSn2/SnO2, FeSn2/SnO2/C contained smaller nanocrystallites of FeSn2(similar to 10 nm) and SnO2 (similar to 5 nm), which were present in the amorphous C matrix and provided enhanced electrochemical performance. The FeSn2/SnO2/C composite had a high reversible initial capacity of 843 mAh.g(-1), a stable capacity retention of above 80% after 100 cycles, and a high C-rate performance of similar to 610 mAh.g(-1) at 3C rate. Moreover, its electrochemical reaction mechanism during lithium insertion/ extraction was determined by ex situ extended X-ray absorption fine structure analysis. Owing to their high electrochemical performance, FeSn2/SnO2/C composites are promising as a new high-performance anode material for lithium-ion batteries. (C) 2019 Elsevier B.V. All rights reserved.
引用
收藏
页码:80 / 87
页数:8
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