Anatase TiO₂ nanoparticles for high power sodium-ion anodes

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• 作者：Liming Wu ; Daniel Buchholz ; Dominic Bresser ; Luciana Gomes Chagas ; Stefano Passerini
• 关键词：Anatase TiO2 nanoparticles ; Anode ; High power ; Electrolyte ; Sodium-ion battery
• 刊名：Journal of Power Sources
• 出版年：1 April, 2014
• 年：2014
• 卷：251
• 期：Complete
• 页码：379-385
• 全文大小：2048 K

文摘

Sodium-ion batteries (SIBs) are considered to be a promising low-cost alternative to common lithium-ion batteries. Herein, we present a detailed electrochemical characterization of anatase TiO₂ nanoparticles as anode material for Na-ion batteries, highlighting the substantial influence of the electrolyte composition (salt and solvent) on the obtainable specific capacity, cycling stability, and particularly the coulombic efficiency. TiO₂-based electrodes cycled using a 1M solution of NaClO₄ in a mixture of ethylene carbonate and propylene carbonate present excellent high rate capability, offering about 100 and 86聽mAh聽g^鈭? at 5.5 and 11C, respectively, which is - to the best of our knowledge - the best high rate capability for all titanium-based sodium-ion anode materials reported so far. Setting the C rate to 5.5C (i.e., 1.85聽A聽g^鈭?), such electrodes can be cycled for more than 1000 cycles without significant capacity decay, confirming their outstanding durability at such high specific current. These results, in combination with its environmental friendliness and cost efficiency, render anatase TiO₂ nanoparticles a promising anode material for high power sodium-ion batteries.