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ACS Appl Mater Interfaces. 2016 Mar 23;8(11):7139-46. doi: 10.1021/acsami.6b00596. Epub 2016 Mar 14.

Acetylene Black Induced Heterogeneous Growth of Macroporous CoV2O6 Nanosheet for High-Rate Pseudocapacitive Lithium-Ion Battery Anode.

Author information

1
State Key Laboratory of Advanced Technology for Materials Synthesis and Processing, Wuhan University of Technology , Hubei, Wuhan 430070, China.
2
Department of Chemistry, University of Wisconsin-Madison , 1101 University Avenue, Madison, Wisconsin 53706, United States.
3
Department of Mechanical and Industrial Engineering, Louisiana State University , Baton Rouge, Louisiana 70830, United States.

Abstract

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.

KEYWORDS:

CoV2O6; heterogeneous growth; lithium-ion battery; macroporous nanosheet; pseudocapacitance

PMID:
26938306
DOI:
10.1021/acsami.6b00596

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