One-step fabricating nitrogen-doped TiO2 nanoparticles coated with carbon to achieve excellent high-rate lithium storage performance
One-step fabricating nitrogen-doped TiO2 nanoparticles coated with carbon to achieve excellent high-rate lithium storage performance
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DOI：
10.1016/j.electacta.2015.11.094
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发表时间：
2016
影响因子：
6.6
通讯作者：
X. Bai;Tao Li;Yong-xin Qi;Yanxiang Wang;Longwei Yin;Hui Li;N. Lun;Yu-Jun Bai
中科院分区：
文献类型：
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作者：
X. Bai;Tao Li;Yong-xin Qi;Yanxiang Wang;Longwei Yin;Hui Li;N. Lun;Yu-Jun Bai
采用钛酸四丁酯水解法制备纳米TiO 2，然后将纳米TiO 2与尿素混合物在550 °C下加热5 h，制备了氮掺杂碳包覆纳米TiO 2。同时N掺杂与涂层碳的结合导致电子和离子导电性的增强，因此改性TiO 2表现出出色的可逆容量，分别为227.7、204.0、186.4、160.6、113.1 mAh g-1，对应于100、200、400、800和1600 mA g-1的电流密度。特别是，改性的TiO 2可以提供106.4 mAh g− 1的优异的长期循环容量，即使在500 mA g− 1的高密度下循环2500次，每次循环的平均容量损失仅为0.016%。该方法制备的改性TiO 2可作为高功率密度锂离子电池的负极材料。
Nitrogen-doped TiO2nanoparticles coated with N-doped carbon are prepared by simply hydrolyzing tetrabutyl titanate to obtain TiO2nanoparticles followed by heating the mixture of nanoparticles and urea at 550 °C for 5 h. The combination of simultaneously N-doping with coating carbon results in the enhancement in electronic and ionic conductivities, thus the modified TiO2exhibits outstanding reversible capacities of 227.7, 204.0, 186.4, 160.6, 113.1 mAh g−1corresponding to current densities of 100, 200, 400, 800 and 1600 mA g−1. In particular, the modified TiO2could deliver an excellent long-term cycling capacity of 106.4 mAh g−1even cycled 2500 times at a high density of 500 mA g−1with an average capacity loss of only 0.016% per cycle. The modified TiO2fabricated by this simple and economical method could serve as the anode material for lithium-ion batteries with high power-density.