Crumpled Graphene-Molybdenum Oxide Composite Powders: Preparation and Application in Lithium-Ion Batteries

被引:120
作者
Choi, Seung Ho [1 ]
Kang, Yun Chan [1 ]
机构
[1] Konkuk Univ, Dept Chem Engn, Seoul 143701, South Korea
基金
新加坡国家研究基金会;
关键词
anode materials; electrochemistry; graphene; lithium-ion batteries; molybdenum oxide; ELECTROCHEMICAL ENERGY-STORAGE; ENCAPSULATED SI NANOPARTICLES; PERFORMANCE ANODE MATERIALS; METAL-OXIDES; ELECTRODE; FABRICATION; NANOSHEETS; NANOSTRUCTURES; REDUCTION; ROUTE;
D O I
10.1002/cssc.201300838
中图分类号
O6 [化学];
学科分类号
0703 ;
摘要
Crumpled graphene-MoO2 composite powders are directly prepared by means of spray pyrolysis and from a stable graphene oxide colloidal solution in the presence of Mo ions. The crumpled graphene-MoO2 composite powders are transformed into MoO3-based composite powders after post-treatment at 300 degrees C. The transmission electron microscopy and dot-mapping images of the post-treatment composite powders show uniform distribution of MoO3 nanocrystals in the crumpled graphene powders. The two typical D and G bands of graphene are observed at 1350 and 1590 cm(-1), respectively, in the Raman spectrum of the graphene-MoO3 composite. In addition, the crumpled graphene-MoO3 powders exhibit superior electrochemical behavior compared to that of pure MoO3 as an anode material for lithium-ion batteries. The initial discharge capacities of the graphene-MoO3 composite and bare MoO3 powders at a current density of 2 Ag-1 are 1490 and 1225 mAhg(-1), respectively. The capacity retention of the graphene-MoO3 composite is 87% after the first cycle, whereas that of bare MoO3 is 47%, as measured after 100 cycles. The reversible discharge capacity of the graphene-MoO3 composite decreases slightly from 1228 to 845 mAhg(-1) as the current density increases from 0.5 to 3 Ag-1.
引用
收藏
页码:523 / 528
页数:6
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