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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Acknowledgements
The authors thank the National Natural Science Foundation of China (No. 21401061), the Anhui Provincial Natural Science Foundation (No. 1308085QB41), the Key project of Anhui Universities support program for Outstanding Youth (No. gxyqZD2016111), and Anhui Provincial Innovation Team of Design and Application of Advanced Energetic Materials (KJ2015TD003).
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Highlights
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Beta-cyclodextrin serves as a novel chelating agent to form highly dispersed sol.
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Li3V2(PO4)3/C porous microspheres are obtained by a sol spray-drying method.
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The microspheres are made of nanoparticles ca. 30–50 nm in size.
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The Li3V2(PO4)3/C presents high-rate capacity with good cyclability.
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Liu, X., Feng, X., Xu, X. et al. Sol-assisted spray-drying synthesis of porous Li3V2(PO4)3/C microspheres as high-activity cathode materials for lithium-ion batteries. J Sol-Gel Sci Technol 86, 343–350 (2018). https://doi.org/10.1007/s10971-018-4644-8
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DOI: https://doi.org/10.1007/s10971-018-4644-8