Liao Jin-Yun, Smith Taylor W, Pandey Raja R, He Xiaoqing, Chusuei Charles C, Xing Yangchuan
Department of Chemical Engineering, University of Missouri Columbia MO 65211 USA
Department of Chemistry, Middle Tennessee State University Murfreesboro TN 37132 USA.
RSC Adv. 2018 Feb 28;8(16):8929-8936. doi: 10.1039/c8ra00468d. eCollection 2018 Feb 23.
NaTiO (NTO) has recently been reported for lithium ion storage and showed very promising results. In this work, we report substantially enhanced rate capability in NTO nanowires by Ti(iii) self-doping and carbon-coating. Ti(iii) doping and carbon coating were found to work in synergy to increase the electrochemical performances of the material. For 300 cycles at 1C (1C = 200 mA g) the charge capacity of the electrode is 206 mA h g, much higher than that (89 mA h g) of the pristine NTO electrode. For 500 cycles at 5C the electrode can still deliver a charge capacity of 180.5 mA h g with a high coulombic efficiency of 99%. At 20C the capacity of the electrode is 2.6 times that of the pristine NTO. These results clearly demonstrate that the Ti(iii) self-doping and uniform carbon coating significantly enhanced the kinetic processes in the NTO nanowire crystal, making it possible for fast charge and discharge in Li-ion batteries.
最近有报道称钛酸钠（NTO）可用于锂离子存储，并且显示出非常有前景的结果。在这项工作中，我们报道了通过三价钛（Ti(iii)）自掺杂和碳包覆，NTO纳米线的倍率性能得到了显著增强。发现Ti(iii)掺杂和碳包覆协同作用可提高材料的电化学性能。在1C（1C = 200 mA g）下循环300次，电极的充电容量为206 mA h g，远高于原始NTO电极的充电容量（89 mA h g）。在5C下循环500次，电极仍可提供180.5 mA h g的充电容量，库仑效率高达99%。在20C下，电极容量是原始NTO的2.6倍。这些结果清楚地表明，Ti(iii)自掺杂和均匀的碳包覆显著增强了NTO纳米线晶体中的动力学过程，使得锂离子电池能够快速充放电。
