Studies on the Structure Designing of Electrode/Electrolyte Interface for Lithium Batteries

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1.Effects of Interface Structure the Reaction Rates of Lithium Electrodes - Electrolyte solutions consisting of ethylene carbonate (EC)-based mixed solvents with LiPF_6 or LiCF_3SO_3 as the salt have been studied for the rechargeable batteries with pitch-based carbon fiber electrodes. High coulombic effieiencies (ca.100%) and high discharge capa ; cities (>200 mAh g^<-1>) were obtained in the slution of EC-dimethyl carbonete (DMC) containing 1 mol dm^<-3> LiCF_3SO_3. The addition of LiOH and/or AlCl_3 to the raw material, saccharose, improved the charge/discharge characteristics of the resulting pyrollytic carbon. The negative electrode performances of B-C-N compounds with graphite like structures were also investigated in various organic electrolyte systems. The electrode pocesses of the polyanilinebased high capacity polymers were also clarified.Characterization of the Interface Structure between Lithium Electrodes and Organic Electrolytes Containing Additives - The addition of AII3 and 2-methylfuran (2MeF) to the electrolyte solution improved the charge/discharge cycling performances of the metallic Li electrode. The mechanisms of the addition effects were clarified using in situ method, such as scanning vibraating eletrode technique (SVET) and an AC impedance method, combined with conventional eletrochemical techniques. Chemical and electrical changes in the interface stucture contributed to the imporvement of the cycling performances of the Li electrode.