Journal
ACS APPLIED MATERIALS & INTERFACES
Volume 8, Issue 11, Pages 7139-7146Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsami.6b00596
Keywords
heterogeneous growth; macroporous nanosheet; CoV2O6; pseudocapacitance; lithium-ion battery
Funding
- National Basic Research Program of China [2013CB934103, 2012CB933003]
- International Science & Technology Cooperation Program of China [2013DFA50840]
- National Natural Science Foundation of China [51302203, 51272197, 51521001]
- National Science Fund for Distinguished Young Scholars [51425204]
- Hubei Science Fund for Distinguished Young Scholars [2014CFA035]
- Fundamental Research Funds for the Central Universities [WUT: 2015-III-021, 2015-III-032, 2015-III-052, 2015-PY-2]
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Metal vanadates suffer from fast capacity fading in lithium-ion batteries especially at a high rate. Pseudocapacitance, which is associated with surface or near-surface redox reactions, can provide fast charge/discharge capacity free from diffusion-controlled intercalation processes and is able to address the above issue. In this work, we report the synthesis of macroporous CoV2O6 nanosheets through a facile one-pot method via acetylene black induced heterogeneous growth. When applied as lithium-ion battery anode, the macroporous CoV2O6 nanosheets show typical features of pseudocapacitive behavior: (1) currents that are mostly linearly dependent on sweep rate and (2) redox peaks whose potentials do not shift significantly with sweep rate. The macroporous CoV2O6 nanosheets display a high reversible capacity of 702 mAh g(-1) at 200 mA g(-1), excellent cyclability with a capacity retention of 89% (against the second cycle) after 500 cycles at 500 mA g(-1), and high rate capability of 453 mAh g(-1) at 5000 mA g(-1). We believe that the introduction of pseudocapacitive properties in lithium battery is a promising direction for developing electrode materials with high-rate capability.
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