Synthesis of composite electrode materials of FeOOH-based particles/carbon powder and their high-rate charge–discharge performance in lithium cells

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• 作者：Hideyuki Morimoto^a ; ^{morimoto@chem-bio.gunma-u.ac.jp"" rel=""nofollow} ; Kazuhiko Takeno^b ; Yuuki Uozumi^a ; Ken-ichi Sugimoto^a ; Shin-ichi Tobishima^a
• 关键词：Lithium cell ; Composite electrode material ; FeOOH ; High-rate charge– ; discharge ; Amorphous ; Iron oxide
• 刊名：Journal of Power Sources
• 出版年：2011
• 出版时间：1 August 2011
• 年：2011
• 卷：196
• 期：15
• 页码：6512-6516
• 全文大小：974 K

文摘

Composite electrode materials of FeOOH-based particles and carbon powder were prepared with and without heat treatment of composite powder. The composite powder was obtained by hydrolyzing mixed aqueous solutions of FeCl₃, Ti(SO₄)₂ and electron conducting carbon powder as acetylene black (AB) or Ketjen black (KB). FeOOH-based materials formed in the presence of Ti(IV) ions became amorphous and/or low crystalline structure. The composite powder worked as lithium insertion electrode materials in lithium cells using nonaqueous electrolytes including lithium ions. The electrodes exhibited a good cycle performance at large charge–discharge current densities over 5 mA cm⁻² (4 A g⁻¹ per weight of active material). In addition, it was found that the cycle performance was effective process to be improved by the heat treatment of the composite materials. The composite materials such as amorphous FeOOH, α-Fe₂O₃, TiO₂ and electron conductive powder obtained by the heat treatment are one of the promising candidates as electrode materials for energy storage devices, such as lithium-ion batteries and hybrid electrochemical supercapacitors.