Journal
ACS APPLIED MATERIALS & INTERFACES
Volume 8, Issue 4, Pages 2812-2818Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsami.5b11510
Keywords
cobalt vanadium oxide; hierarchical structure; lithium-ion battery; lithium storage mechanism; graphene oxide
Funding
- National Basic Research Program of China [2013CB934103, 2012CB933003]
- International Science & Technology Cooperation Program of China [2013DFA50840]
- National Natural Science Foundation of China [51521001, 51272197]
- National Natural Science Fund for Distinguished Young Scholars [51425204]
- Fundamental Research Funds for the Central Universities [WUT: 2015-III-021, 2015-III-032]
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Hierarchical Co2V2O7 nanosheets consisted of interconnected nanoparticles are synthesized by a facile method using graphene oxide as the template. The electrochemical reaction mechanism of the Co2V2O7 nanosheets is thoroughly investigated by in situ XRD and ex situ TEM. The initial Co2V2O7 transforms into CoO nanoparticles and vanadium oxides in the first cycle, and the following reversible conversion reaction mainly occurs between CoO and Co and lithiation/delithiation of the vanadium oxides. The Co2V2O7 nanosheet displays a high reversible capacity (962 mAh/g at 0.5 A/g) and remarkable high rate capability. When cycled at 5.0 A/g, a reversible capacity of 441 mAh/g can be retained after 900 cycles. The stable high capacity and excellent rate capability make the hierarchical Co2V2O7 nanosheets a promising anode material for lithium-ion batteries.
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