2-Vinylpyridine as Film-forming Additve to Suppress the Degradation of Carbon Anode by Dissolved Manganese for C/LiMn<SUB>2</SUB>O<SUB>4</SUB> Rechargable Battery

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  • 2-Vinylpyridine as Film-forming Additve to Suppress the Degradation of Carbon Anode by Dissolved Manganese for C/LiMn2O4 Rechargable Battery

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For lithium-ion batteries of C/(spinel Li–Mn–O), the sever capacity loss occurs after storage of the battery at >50 °C. This is mainly due to degradation of the carbon which was induced by electroreduction of Mn(II) dissolved from the spinel; this step is followed by the irreversible electrochemical reaction at the graphite/(Mn deposits)/electrolyte interface. However, 2-vinylpyridine as an additive into the electrolyte was capable of suppressing this degradation of graphite anode, therefore, improved the battery performances. During the first charge, electropolymerization of 2-vinylpyridine from about 0.9 V vs Li/Li+ resulted in film formation of poly(2-vinylpyridine) on the anode surface. The polymer protected the graphite from dissolved Mn(II).

Journal

  • Chemistry Letters

    Chemistry Letters 31 (12), 1236-1237, 2002

    The Chemical Society of Japan

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