Journal
JOURNAL OF ALLOYS AND COMPOUNDS
Volume 729, Issue -, Pages 49-56Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.jallcom.2017.09.106
Keywords
Li3V2(PO4)(3); Li-ion batteries; Cathode; Wet-chemical coordination approach
Categories
Funding
- National Key R&D Program of China: Trackling Key Technology for Development and Industrialization of Power Lithium Ion Battery with High Specific Energy [2016YFB0100508]
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Lithium vanadium phosphate (Li3V2(PO4)(3)) is one of the most promising cathode materials for developing practical Li-ion batteries due to its advantages of structural stability, low cost, relatively high energy density. For this purpose, a wet-chemical coordination approach has been applied to synthesis of the Li3V2(PO4)(3)/C (LVP/C) cathode materials for Li-ion batteries. The structure, morphology, and electrochemical and kinetic behaviors of LVP/C samples calcined at different temperatures are studied. The optimized Li3V2(PO4)(3) sample calculated at 850 degrees C (denoted as LVP-850) exhibits excellent rate performance: at high rate of 0.5, 1, 5, 10 and 20 C, impressive specific capacity of 110.9, 106, 91.2, 83 and 43.6 mAh g(-1) can still be attainted, respectively. Even through it recovers back to 0.1 C, the cell can still deliver a capacity of 114.4 mAh g(-1) (about 97.9% of the initial capacity). Combined with cyclic voltammetry technique and ex-situ X-ray photoemission spectroscopy (XPS), the Li+ insertion/extraction reaction mechanisms are also confirmed. Such an efficient method plays a critical role in improving rate performance and cyclic reversibility of Li3V2(PO4)(3) particles, and should also be appropriate for other functional electrode materials. (C) 2017 Elsevier B.V. All rights reserved.
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