TiO2/Si composites synthesized by sol-gel method and their improved electrode performance as Li-ion battery anodes
TiO2/Si composites synthesized by sol-gel method and their improved electrode performance as Li-ion battery anodes
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DOI：
10.1016/j.electacta.2013.08.015
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发表时间：
2013-11-30
影响因子：
6.6
通讯作者：
Sakaguchi, Hiroki
中科院分区：
文献类型：
--
作者：
Usui, Hiroyuki;Wasada, Kuniak;Sakaguchi, Hiroki
采用简单的溶胶-凝胶法制备了金红石型二氧化钛/硅复合材料作为锂离子电池负极材料。采用气相沉积法制备了二氧化钛/硅复合材料，研究了无粘结剂厚膜电极的阳极性能。复合电极表现出显著的循环性能和良好的高倍率性能：第900次循环的放电容量为710mAHg(-1)，即使在4.8C的高电流倍率下，单位硅重量的比容仍高达1870mAHg(Si)(-1)。研究结果为金红石型二氧化钛作为锂离子导体在下一代锂离子电池硅基电极中的应用提供了依据。(C)2013爱思唯尔有限公司。保留所有权利。
Composites of rutile-type TiO2 and Si were synthesized by a facile sol-gel method for a high-performance anode of Li-ion battery. We have investigated anode performance of binder-free thick-film electrodes prepared by a gas-deposition method using the TiO2/Si composites obtained. The composite electrode exhibited a remarkably improved cyclability and a good high-rate performance: a discharge capacity at the 900th cycle was 710 mAh g(-1), and a specific capacity per Si weight was as large as 1870 mAh g(Si)(-1) even at a high current rate of 4.8 C. It is suggested that a fast Li-ion diffusion in TiO2 provides smooth insertion/extraction of Li-ion into/from the composite electrodes. The results offer a utility of rutile TiO2 as a Li-ion conductor in Si-based electrodes for the next-generation Li-ion battery. (C) 2013 Elsevier Ltd. All rights reserved.