Journal
ELECTROCHIMICA ACTA
Volume 218, Issue -, Pages 199-207Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.electacta.2016.09.103
Keywords
K0.25V2O5; nanobelt; hierarchical architecture; long-cycle-life; electrochemical property
Categories
Funding
- National High Technology Research and Development Program of China (863 Program) [2013AA110106]
- National Natural Science Foundation of China [51374255, 51572299]
- Fundamental Research Funds for Central Universities of Central South University [2015zzts174, 160210001]
- U.S. Department of Energy (DOE), Office of Basic Energy Sciences, Division of Materials Sciences and Engineering [KC020105-FWP12152]
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Lithium vanadium oxides and vanadates have wide attention as cathode materials for Li ion battery applications, but there has been limited study on other cations substituted vanadium compounds, which could have favorable electrochemical properties. Here we report the synthesis and electrochemical properties of aggregated K0.25V2O5 nanobelts and the optimization of the crystalline structure for fast Li ion insertion. We propose a partial melting and self-alignment mechanism to produce the aggregated nanobelts. This material can deliver a high discharge capacity of 232 mA h(-1) at 100 mA g(-1) and high rate capability. It also exhibits superior long-term cycling performance with no capacity fading over 800 cycles at high current density of 1, 1.5, and 2 A g(-1). Remarkably, although some work has been devoted to potassium vanadates, there is little work introducing this class of materials with super long lifespan. The results demonstrate that the as-prepared K0.25V2O5 would be a potential candidate for LIBs. (C) 2016 Elsevier Ltd. All rights reserved.
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