Journal
JOURNAL OF POWER SOURCES
Volume 196, Issue 22, Pages 9786-9791Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.jpowsour.2011.08.015
Keywords
Li-ion battery; Ammonium trivanadate; Carbon nanotubes; Hydrothermal method; Cycling stability
Funding
- Major State Basic Research Development Program of China (973 Program) [2010CB227204]
- National Natural Science Foundation of China [50972165]
- Research Foundation of Hunan Province for Ph.D Student [CX2010B114]
- Graduate Degree Thesis Innovation Foundation of Central South University
- Chinese government
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NH4V3O8/carbon nanotubes (CNTs) composites are synthesized by one-step hydrothermal method. All the samples show the flake-like morphology with the width of up to 5 mu m and thickness of 500 nm and the CNTs are clearly observed on the surface of modified NH4V3O8. It is found that incorporation of 0.5 wt% CNTs into NH4V3O8 could greatly improve its discharge capacity and cycling stability. It delivers a maximum discharge capacity of 358.7 mAh g(-1) at 30 mAg(-1), 55 mAh g(-1) larger than that of the pristine one. At 150 mA g(-1), the composite shows 226.2 mAh g(-1) discharge capacity with excellent capacity retention of 97% after 100 cycles. The much improved electrochemical performance of NH4V3O8 is attributed to incorporation of CNTs, which facilitates the interface charge transfer and Li diffusion. (C) 2011 Elsevier B.V. All rights reserved.
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