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Electrochemical performance of B and M phases VO 2 nanoflowers
Author(s) -
Ni Juan,
Jiang Wentao,
Yu Ke,
Sun Fang,
Zhu Ziqiang
Publication year - 2011
Publication title -
crystal research and technology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.377
H-Index - 64
eISSN - 1521-4079
pISSN - 0232-1300
DOI - 10.1002/crat.201100110
Subject(s) - electrochemistry , cyclic voltammetry , lithium (medication) , hydrothermal circulation , aqueous solution , cathode , phase (matter) , electrode , hydrothermal synthesis , materials science , lithium ion battery , analytical chemistry (journal) , chemistry , battery (electricity) , chemical engineering , chromatography , medicine , power (physics) , physics , organic chemistry , quantum mechanics , engineering , endocrinology
VO 2 exists in four phases, among which, the M/R phase VO 2 is well known for its reversible metal‐semiconductor phase transition at about 68 °C, and VO 2 (B) is a promising candidate cathode material to be applied in aqueous lithium‐ion battery owing to its proper electrode potential and layered structure. In this study, VO 2 (B) nanoflowers was synthesized via one‐step hydrothermal process and then successfully transformed into the VO 2 (M) by heat treatment. Electrochemical behaviors of the two samples were evaluated by cycling discharge and cyclic voltammetry (CV). The results showed that flower‐like VO 2 (B) had the first discharge capacity of 180.33 mAhg‐1, an outstanding value of 52.8% for the capacity retention after 50 cycles. (© 2011 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)
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