Simple synthesis and particle size effects of TiO₂ nanoparticle anodes for rechargeable lithium ion batteries

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• 作者：Alok Kumar Rai ; Ly Tuan Anh ; Jihyeon Gim ; Vinod Mathew ; Jungwon Kang ; Baboo Joseph Paul ; Jinju Song ; Jaekook Kim ; ^{jaekook@chonnam.ac.kr}
• 关键词：Anatase TiO2 ; Anode ; Particle size ; Electrochemical properties ; Li-ion batteries
• 刊名：Electrochimica Acta
• 出版年：2013
• 出版时间：15 February, 2013
• 年：2013
• 卷：90
• 期：Complete
• 页码：112-118
• 全文大小：1830 K

文摘

Urea-assisted auto-combustion synthesis was used for the easy and scalable preparation of TiO₂ nanoparticles for use as anodes in lithium-ion batteries. The prepared TiO₂ powder was annealed at 300 ¡ãC, 400 ¡ãC, 500 ¡ãC and 600 ¡ãC to optimize the system and assess the effects of particle size on electrochemical properties. X-ray diffraction patterns confirmed that pure anatase phase TiO₂ formed at up to 500 ¡ãC, above which mixed phases of anatase and rutile emerged. Field-emission transmission electron microscopy showed that spherical particles of 8-25 nm were formed. The electrochemical performances of annealed TiO₂ samples were tested by charging/discharging, C-rate measurement and electrochemical impedance spectroscopy. It was clearly found that the crystal particle size has a striking impact on the Li insertion behavior and lithium storage capability. TiO₂ nanoparticles electrode annealed at lower temperature 300 ¡ãC showed high rate capability, excellent capacity retention and high electrical conductivity due to its very small particles and nonideal crystal lattices.