Synthesis of Li₃V₂(PO₄)₃/C with high tap-density and high-rate performance by spray drying and liquid nitrogen quenching method

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• 作者：Bao Zhang ; Jun-chao Zheng ; ^{jczheng@csu.edu.cn} ; ^{tonyson_011@163.com}
• 关键词：Lithium ion battery ; Cathode material ; Li3V2(PO4)3 ; Spray drying ; Quenching
• 刊名：Electrochimica Acta
• 出版年：2012
• 期刊代码：30_00134686
• 类别：ch
• 出版时间：15 April, 2012
• 卷：67
• 期：Complete
• 页码：55-61
• 文件大小：1336 K

摘要

Li₃V₂(PO₄)₃ cathode material was prepared by spray drying and liquid nitrogen quenching method. The quenched sample, which is well crystallized with a single monoclinic Li₃V₂(PO₄)₃ phase, exhibits a slightly contracted lattice parameters a, b and c compared with the natural-cooled one. The sample shows rough similar-spherical particles in the size of 0.5-4 渭m, and its tap-density is as high as 1.64 g cm^鈭?. HRTEM results indicate that rapid quenching leads to the formation of a number of defects in Li₃V₂(PO₄)₃ crystals. Electrochemical tests reveal that the defects greatly improved the rate capability and cycle performance of Li₃V₂(PO₄)₃. The quenched sample delivers an initial discharge capacity of 124.1 and 113.6 mAh g^鈭? at 2 C and 10 C rate, respectively, and shows the capacity retention of 97.6%and 93.4%after 100 cycles.