n-Type redox behaviors of polybithiophene and its implications for anodic Li and Na storage materials

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• 作者：Limin Zhu ; Yijie Niu ; Yuliang Cao ; Aiwen Lei ; Xinping Ai ; Hanxi Yang
• 关键词：Polybithiophene ; n-Type redox polymers ; Organic anode materials ; Lithium-ion batteries ; Na-ion batteries
• 刊名：Electrochimica Acta
• 出版年：2012
• 出版时间：1 September, 2012
• 年：2012
• 卷：78
• 期：Complete
• 页码：27-31
• 全文大小：769 K

文摘

A polybithiophene-carbon (PBT/C) composite was synthesized by ball-milling chemically polymerized polybithiophene with carbon nanofibers and found to have n-type redox properties with exceptional reversible capacity and cycling stability. The experimental results demonstrated that the as-synthesized (PBT/C) composite can realize a total two-electron redox capacity of ¡«850 mAh g^?1 with half of the capacity delivered at a low potential plateau of 1.25 V in Li⁺ electrolyte, possibly serving as a high capacity organic anode for Li-ion batteries. More significantly, the PBT/C composite can also be cycled in Na⁺-electrolyte, delivering a reversible redox capacity of ¡«500 mAh g^?1 through the doping-dedoping reactions of Na⁺ ions into/from the polymer chains. These n-type redox performances suggest a possible application of the polymers of this type as high capacity and cycling-stable anodes for Li-ion and Na-ion batteries.