Li3V2(PO4)3@C 核壳纳米复合材料作为锂离子电池的优异正极材料。
Li3V2(PO4)3@C core-shell nanocomposite as a superior cathode material for lithium-ion batteries.
机构信息
Key Laboratory of Advanced Energy Materials Chemistry (Ministry of Education), College of Chemistry, Nankai University, Tianjin, 300071, PR China.
出版信息
Nanoscale. 2013 Jul 21;5(14):6485-90. doi: 10.1039/c3nr01617j. Epub 2013 Jun 10.
Li3V2(PO4)3@C core-shell nanoparticles with typical sizes of 20-40 nm were synthesized using a hydrothermal-assisted sol-gel method. Ascorbic acid and PEG-400 were adopted as carbon sources and reductants. The uniform Li3V2(PO4)3@C nanocomposite obtained was composed of a Li3V2(PO4)3 core with high-phase purity and a graphitized carbon shell, which was characterized using XRD, SEM, TEM, and Raman analysis. The nanocomposite exhibited a remarkably high rate capability and long cyclability, delivering a discharge capacity of 138 mA h g(-1) at 5 C within a voltage range of 3-4.8 V and the capacity retention was 86% after 1000 cycles. The superior electrochemical performance of Li3V2(PO4)3@C indicates that it has potential for application as a cathode material in advanced rechargeable lithium-ion batteries.
采用水热辅助溶胶-凝胶法合成了粒径为 20-40nm 的典型 Li3V2(PO4)3@C 核壳纳米粒子。采用抗坏血酸和聚乙二醇 400 作为碳源和还原剂。通过 XRD、SEM、TEM 和 Raman 分析，得到的均匀 Li3V2(PO4)3@C 纳米复合材料由具有高相纯度的 Li3V2(PO4)3 核和石墨化碳壳组成。该纳米复合材料具有出色的倍率性能和长循环寿命，在 3-4.8V 的电压范围内以 5C 的电流密度可提供 138mA h g(-1)的放电容量，1000 次循环后的容量保持率为 86%。Li3V2(PO4)3@C 的优异电化学性能表明，它有可能作为先进可充电锂离子电池的正极材料得到应用。
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