Sol-assisted spray-drying synthesis of porous Li3V2(PO4)3/C microspheres as high-activity cathode materials for lithium-ion batteries |
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| Authors: | Xiaoyu Liu Xuejiao Feng Xiaoning Xu Fei Wang Yanming Wang |
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| Affiliation: | 1.Anhui Key Laboratory of Energetic Materials, School of Chemistry and Materials Science,Huaibei Normal University,Huaibei,China;2.Institute of Science and Technology Strategy,Jiangxi Academy of Sciences,Nanchang,China |
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| Abstract: | Herein, porous Li3V2(PO4)3/C microspheres made of nanoparticles are obtained by a combination of sol spray-drying and subsequent-sintering process. Beta-cyclodextrin serves as a special chelating agent and carbon source to obtain carbon-coated Li3V2(PO4)3 grains with the size of ca. 30–50?nm. The unique porous structure and continuous carbon skeleton facilitate the fast transport of lithium ion and electron. The Li3V2(PO4)3/C microspheres offer an outstanding electrochemical performance, which present a discharge capacity of 122?mAh?g?1 at 2?C with capacity retention of 96% at the end of 1000 cycles and a high-rate capacity of 113?mAh?g?1 at 20?C in the voltage window of 3.0–4.3?V. Moreover, the Li3V2(PO4)3/C microspheres also give considerable cycling stability and high-rate reversible capacity at a higher end-of-charge voltage of 4.8?V. | |
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