High Power Battery Electrodes Using Nanoporous V2O5/Carbon Composites
High Power Battery Electrodes Using Nanoporous V2O5/Carbon Composites
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DOI：
10.1021/jp071806p
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发表时间：
2007-05
影响因子：
3.7
通讯作者：
Hirotoshi Yamada;Kazuki Tagawa;M. Komatsu;I. Moriguchi;T. Kudo
中科院分区：
文献类型：
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作者：
Hirotoshi Yamada;Kazuki Tagawa;M. Komatsu;I. Moriguchi;T. Kudo
用V2O5凝胶包覆多孔碳制备了锂离子电池纳米孔复合电极，并对其高倍率性能进行了研究。以SiO_2胶体晶体为模板制备的多孔炭具有有序的三维连通孔结构。将多孔炭在减压下反复浸泡在V2O5溶胶中，制得V2O5/碳复合材料。所制得的纳米多孔V2O5/碳复合材料在5.0A(g-复合)-1下表现出大于100mAhg-1的大容量和80%的倍率性能。较大的比表面积的双电层电容和对V2O5凝胶的高速率锂插入率解释了其良好的性能。根据计算，使用纳米孔复合电极有望在100A(g-复合)-1下获得177 mAh(g-复合)-1的超高功率能源。
Nanoporous composite electrodes for lithium ion batteries were successfully fabricated by coating porous carbon with V2O5 gel, and their high rate capability was demonstrated. The porous carbons prepared by using SiO2 colloidal crystals as templates exhibited ordered three dimensionally interconnected pores. The porous carbons were immersed in V2O5 sol under reduced pressure repeatedly to obtain V2O5/carbon composites. The nanoporous V2O5/carbon composites thus obtained exhibited large capacity of more than 100 mAh (g-composite)-1 and good rate capability of 80% at 5.0 A (g-composite)-1. The good performance is explained by electric double layer capacitance of large surface area and high rate lithium insertion to V2O5 gel. According to a calculation, very high-power energy sources with 177 mAh (g-composite)-1 at 100 A (g-composite)-1 are expected by using the nanoporous composite electrodes.