Journal
ELECTROCHIMICA ACTA
Volume 119, Issue -, Pages 38-42Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.electacta.2013.12.039
Keywords
lithium batteries; layered lithium intercalation compound; potassium vanadium bronze.
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We report here for the first time the reversible electrochemical lithium insertion in the potassium vanadium bronze K0.5V2O5 leading to LixK0.5V2O5 with 0 < x <= 1.5. Long and thin platelets of K0.5V2O5 are prepared by a fast and facile synthesis route. A specific capacity of 210 mAh g(-1) is available at an average voltage of 2.6 V without any significant structural changes even after extended cycling experiments. This vanadium bronze exhibits an excellent capacity retention with still 200 mAh g-1 at C/10 after 70 cycles and a good rate capability with 140 and 120 mAh g-1 at 1C and 1.4C respectively. The electrochemical performance of this cathode material is one of the best among vanadium bronzes. (C) 2013 Elsevier Ltd. All rights reserved.
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