Copper-doped Li4Ti5O12/carbon nanofiber composites as anode for high-performance sodium-ion batteries
Copper-doped Li4Ti5O12/carbon nanofiber composites as anode for high-performance sodium-ion batteries
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DOI：
10.1016/j.jpowsour.2014.08.131
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发表时间：
2014-12-25
影响因子：
9.2
通讯作者：
Zhang, Xiangwu
中科院分区：
文献类型：
--
作者：
Ge, Yeqian;Jiang, Han;Zhang, Xiangwu
氧化钛锂（Li4Ti5O12）具有良好的安全性和可靠性，是一种很有前途的负极材料。然而，Li4Ti5O12的主要挑战是材料电导率低，这限制了它的电化学性能。为了将Li4Ti5O12应用于钠离子电池，制备了掺杂铜的Li4Ti5O12纳米粒子（Li4-xCuxTi5O12, x = 0,0.05, 0.1），以提高其电子导电性。然后将掺杂铜的Li4Ti5O12纳米粒子嵌入连续碳纳米纤维（CNFs）中，从而产生沿纤维方向的快速电子转移。经过铜掺杂和CNF包埋后，得到的掺铜Li4Ti5O12/CNFs在30 mA g（-1）下具有优异的可逆容量（158.1 mAh g(-1)），高库仑效率（99.87%），循环150次后具有良好的容量保持率（91%）。此外，掺杂铜的Li4Ti5O12/CNFs也表现出良好的速率能力。因此，证明了掺杂铜的Li4Ti5O12/CNFs是很有前途的阳极候选材料。(C) 2014 Elsevier B.V.版权所有
Lithium titanium oxide (Li4Ti5O12) is a promising anode material, owing to its superior safety and reliability. However, the main challenge of Li4Ti5O12 is the low material conductivity which restricts its electrochemical performance. In order to use Li4Ti5O12 in practical sodium-ion batteries, copper-doped Li4Ti5O12 (Li4-xCuxTi5O12, x = 0, 0.05, 0.1) nanoparticles were prepared to enhance the electronic conductivity. Copper-doped Li4Ti5O12 nanoparticles were then embedded in continuous carbon nanofibers (CNFs), which gave rise to fast electron transfer along the fiber direction. After copper-doping and CNF embedding, the resultant copper-doped Li4Ti5O12/CNFs achieved excellent reversible capacity (158.1 mAh g(-1)) at 30 mA g(-1), high coulombic efficiency (99.87%), and good capacity retention (91%) after 150 cycles. In addition, copper-doped Li4Ti5O12/CNFs also exhibited good rate capability. It is, therefore, demonstrated that copper-doped Li4Ti5O12/CNFs are promising anode candidate. (C) 2014 Elsevier B.V. All rights reserved.