Effects of manganese acetate on the anodic performance of carbon nanotubes for Li ion rechargeable batteries

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• 作者：Ishihara ; Tatsumi ; Kawahara ; Akihiro ; Nishiguchi ; Hiroyasu ; Yoshio ; Masaki ; Takita ; Yusaku
• 关键词：Carbon nanotube ; Anode ; Manganese acetate ; Modification
• 刊名：Journal of Power Sources
• 出版年：2003
• 出版时间：June 1, 2003
• 年：2003
• 卷：119-121
• 期：Complete
• 页码：24-27
• 全文大小：110 K

文摘

Effects of the addition of various manganese compounds on anodic performance of carbon nanotube were investigated. It was seen that the Li intercalation capacity decreased drastically by the addition of most manganese compounds. However, addition of Mn(CH₃COO)₂ greatly improved the capacity for Li intercalation. Li intercalation capacity increased with increasing Mn(CH₃COO)₂ concentration and the largest capacity of 360 and 330mAh/g for the insertion and reversible Li intercalation was achieved when 1wt. % Mn(CH₃COO)₂ was added. The increased capacity was sustained after 50 times of charge and discharge cycles. X-ray absorption near edge spectra (XANES) suggests that the state of added Mn ion is close to MnO₂ and so the added Mn(CH₃COO)₂ decomposed during preparation. The surface organic layer formed by the acetic acid appears to give a superior solid electrolyte interface (SEI). The positive effects of Mn(CH₃COO)₂ are obtained only when manganese ion and acetic acid coexist. Therefore, it is believed that the coexisting Mn ion works as a catalyst for the decomposition of acetic acid.