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

1.研究了界面结构对锂电极反应速率的影响——以LiPF_6或LiCF_3SO_3为盐的碳酸乙酯（EC）基混合溶剂组成的电解质溶液用于沥青基碳纤维电极可充电电池。库仑效率高（可达100%），放电容量大；在含有1 mol dm^<-3> LiCF_3SO_3的ec -二甲基碳酸酯（DMC）溶液中，得到了（>200 mAh g^<-1>）。在原料蔗糖中加入LiOH和/或AlCl_3，改善了所得热解碳的充放电特性。研究了类石墨结构的B-C-N化合物在不同有机电解质体系中的负极性能。阐明了聚苯胺基高容量聚合物的电极工艺。锂电极与含添加剂有机电解质界面结构的表征——在电解质溶液中加入AII3和2-甲基呋喃（2MeF）改善了金属锂电极的充放电循环性能。利用扫描振动电极技术（SVET）和交流阻抗法等原位方法，结合常规电化学技术，明确了添加效应的机理。界面结构的化学和电学变化有助于提高锂电极的循环性能。

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.