Enhanced electrochemical performance of Li-ion batteries with nanoporous titania as negative electrodes

查看全文 作　　者：Md.Arafat [1]Rahman;Xiaojian [1]Wang;Cuie [1,2]Wen 机构地区：[1]Faculty of Science, Engineering and Technology, Swinburne University of Technology;[2]School of Aerospace, Mechanical and Manufacturing Engineering, RMIT University Bundoora 出　　处：《Journal of Energy Chemistry》索引2015年第24卷第2期,共14页 基　　金：supported by the Australia-India Strategic Research Fund(AISRF,ST060048) 摘　　要：Nanoporous anatase TiO2(np-TiO2) electrodes have been developed via the anodization of titanium foils in fluoride containing electrolytes,and its application in rechargeable lithium-ion batteries(LIBs) was investigated. Four different types of np-TiO2 electrodes with different pore diameters of 14.7±8.2 nm, 12.8±6.8 nm, 11.0±5.5, and 26.7±13.6 nm were fabricated for evaluating the effect of nanoporous characteristics on the LIB performance. The discharge capacity of the four battery types 1, 2, 3, and 4 were 132.7 m Ah g-1, 316.7 m Ah g-1, 154.3 m Ah g-1,and 228.4 m Ah g-1, respectively. In addition, these electrodes 1, 2, 3, and 4 exhibited reversible capacity of 106.9 m Ah g-1after 295 th,180.9 m Ahg-1 after 220 th, 126.1 m Ah g-1after 150 th, and 206.7 m Ahg-1after 85 th cycle at a rate of 1 C, respectively. It was noted that the cyclic life of the batteries had an inverse relationship, and the capacity had a proportional relationship to the pore diameter. The enhanced electrochemical performance of the nanoporous electrodes can be attributed to the improved conductivity and the enhanced kinetics of lithium insertion/extraction at electrode/electrolyte interfaces because of the large specific surface area of np-TiO2 electrodes. 关 键 词：纳米二氧化钛 锂离子电池 电化学性能 多孔电极 负极 放电容量 循环寿命 含氟化物