Mixed bi-material electrodes based on LiMn₂O₄ and activated carbon for hybrid electrochemical energy storage devices

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• 作者：Dario  ; Cericola ; Petr  ; Nová ; k ; Alexander  ; Wokaun ; Rü ; diger  ; Kö ; tz  ; ;   ; ^{ruediger.koetz@psi.ch}
• 关键词：Electrochemical capacitor ; Lithium-ion battery ; Hybrid energy storage device ; Asymmetric capacitor ; Supercapacitor
• 刊名：Electrochimica Acta
• 出版年：2011
• 出版时间：1 October 2011
• 年：2011
• 卷：56
• 期：24
• 页码：8403-8411
• 全文大小：862 K

文摘

The performance of mixed bi-material electrodes composed of the battery material, LiMn₂O₄, and the electrochemical capacitor material, activated carbon, for hybrid electrochemical energy storage devices is investigated by galvanostatic charge/discharge and pulsed discharge experiments. Both, a high and a low conductivity lithium-containing electrolyte are used. The specific charge of the bi-material electrode is the linear combination of the specific charges of LiMn₂O₄ and activated carbon according to the electrode composition at low discharge rates. Thus, the specific charge of the bi-material electrode falls between the specific charge of the activated carbon electrode and the LiMn₂O₄ battery electrode. The bi-material electrodes have better rate capability than the LiMn₂O₄ battery electrode. For high current pulsed applications the bi-material electrodes typically outperform both the battery and the capacitor electrode.