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首页> 外文期刊>RSC Advances >Substantially enhanced rate capability of lithium storage in Na2Ti6O13 with self-doping and carbon-coating
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Substantially enhanced rate capability of lithium storage in Na2Ti6O13 with self-doping and carbon-coating

机译：通过自掺杂和碳涂层大大提高了Na2Ti6O13中锂存储的速率能力

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Na _(2) Ti _(6) O _(13) (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 ~(?1) ) the charge capacity of the electrode is 206 mA h g ~(?1) , much higher than that (89 mA h g ~(?1) ) of the pristine NTO electrode. For 500 cycles at 5C the electrode can still deliver a charge capacity of 180.5 mA h g ~(?1) 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.
机译：最近报道了Na_（2）Ti_（6）O_（13）（NTO）用于锂离子存储，并显示出非常有希望的结果。在这项工作中，我们报告通过Ti（III）自掺杂和碳涂层大大提高了NTO纳米线的速率能力。发现Ti（III）掺杂和碳涂层协同作用以增加材料的电化学性能。在1C（1C = 200 mA g〜（？1））下进行300次循环后，电极的充电容量为206 mA hg〜（？1），远高于原始电荷的电荷容量（89 mA hg〜（？1））。 NTO电极。在5C下进行500次循环后，电极仍可提供180.5 mA h g〜（？1）的电荷容量，库仑效率高达99％。在20°C时，电极的容量是原始NTO的2.6倍。这些结果清楚地表明，Ti（III）自掺杂和均匀的碳涂层显着增强了NTO纳米线晶体中的动力学过程，从而使锂离子电池中的快速充电和放电成为可能。

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