Carbon-coated Li4Ti5O12 as a high rate electrode material for Li-ion intercalation
Carbon-coated Li4Ti5O12 as a high rate electrode material for Li-ion intercalation
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碳包覆的 Li4Ti5O12 作为锂离子嵌入的高倍率电极材料
DOI：
10.1149/1.2736644
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发表时间：
2007-01-01
影响因子：
3.9
通讯作者：
Xia, Yong-Yao
中科院分区：
文献类型：
--
作者：
Cheng, Liang;Li, Xi-Li;Xia, Yong-Yao
Li 4 Ti 5 O 12是一种很有前途的高功率密度锂离子电池和混合超级电容器的电极材料，但存在电导率低的缺点。本文报道了一种在Li 4 Ti 5 O 12颗粒表面包覆均匀的纳米石墨化碳的热气相分解方法。在800 ℃下涂覆的所得产物具有5 nm厚的碳层和2.05S/cm的电导率，其远高于原料Li 4 Ti 5 O 12的电导率（< 10（-13）S/cm）。因此，当用作电化学超级电容器的负极时，其显示出好得多的倍率性能。交流阻抗测试结果表明，碳包覆的Li 4 Ti 5 O 12由于有效界面反应面积大，具有较小的电荷转移电阻。(C)2007年电化学学会。
Li4Ti5O12 is a promising electrode material for high power density lithium-ion batteries and hybrid supercapacitors, but has the drawback of low electrical conductivity. We report a thermal vapor decomposition method to coat a uniform nanothickness graphitized-carbon on the Li4Ti5O12 particle surface. The resulting product coated at 800 degrees C has a 5 nm thick carbon layer and a electrical conductivity of 2.05 S/cm, which is much higher than that of raw Li4Ti5O12 (< 10(-13) S/cm). As a result, it shows much better rate capability when used as a negative electrode for electrochemical supercapacitors. AC impedance measurements reveal that the carbon-coated Li4Ti5O12 has smaller charge-transfer resistance due to large effective interface reaction area. (C) 2007 The Electrochemical Society.