Sol-gel synthesis of Li3VO4/C composites as anode materials for lithium-ion batteries
Sol-gel synthesis of Li3VO4/C composites as anode materials for lithium-ion batteries
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DOI：
10.1016/j.jallcom.2020.157364
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发表时间：
2020-12
影响因子：
6.2
通讯作者：
E. Thauer;G. Zakharova;S. Wegener;Q. Zhu;R. Klingeler
中科院分区：
文献类型：
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作者：
E. Thauer;G. Zakharova;S. Wegener;Q. Zhu;R. Klingeler
以酒石酸、苹果酸或葡萄糖为络合剂和碳源，采用溶胶-凝胶法，在650℃、1h的氮气中进行后处理，合成了Li3VO4/C复合材料。这些有机添加剂的存在对最终产品的形态和微晶尺寸有至关重要的影响。研究发现，锂离子电池负极材料Li3VO4/C的电化学性质受材料的形貌、织构和碳含量的影响。当使用羧酸作为碳源时，可以得到具有介孔结构和高比表面积的复合材料，表现出增强的电化学活性。初步获得了约400mAhg−1的可逆容量。相比之下，用葡萄糖合成的Li3VO4/C在循环稳定性方面表现更好。100次循环后的放电容量为299mAHg−1，容量保持率为96%。结果表明，碳复合材料对Li3VO4的电化学性能有良好的影响。
Li3VO4/C composites have been synthesized by a sol-gel method and post-annealing at 650 °C for 1 h in N2flow using either tartaric acid, malic acid, or glucose as both chelating agents and carbon source. The presence of these organic additives crucially affects morphology and crystallite size of the final product. It is found that the electrochemical properties of Li3VO4/C as anode material for Li-ion batteries (LIBs) are influenced by the morphology, texture and carbon content of the material. When using carboxylic acids as carbon source composites with mesoporous structure and a high surface area are obtained that display an enhanced electrochemical activity. Initially, reversible capacity of about 400 mAh g−1is obtained. In contrast, Li3VO4/C synthesized with glucose outperforms in terms of cycling stability. It exhibits a discharge capacity of 299 mAh g−1after 100 cycles corresponding to an excellent capacity retention of 96%. The favorable effect of carbon composites on the electrochemical performance of Li3VO4is shown.