Fundamental study on the development of electrode materials for new lithium secondary batteries with high energy density.

在本世纪的最后25年，人们对各种高能电池进行了大量的研究。在先进电池中，以插层化合物为正极，以金属锂或碳材料为负极的锂二次电池因其电压高、容量大而得到了广泛的研究。这项合作研究资助的目的是在每个电极上设计和建造一个新的反应场，并开发用于先进二次电池的新材料。在本次合作研究的总会议上，就元素材料阴极尖晶石型氧化物、氧化钒锂和氧化镍锂，阳极碳和锂离子电解质，非醚混合溶剂，聚合物电解质，铝硅酸盐玻璃固体电解质，电化学和表面分析，扩散系数电位步长时间安培，阳极材料拉曼光谱，晶体结构和物理性质，x射线和中子衍射，电导率，磁化率，从本次合作研究得到的结果，指出了二次锂电池的能量密度与循环寿命的关系。这一讨论将大大有助于二次电池性能的提高。同时，提出了许多亟待解决的问题。因此，这种合作研究在未来将是非常重要的。

In This last quarter of the century, a lot of investigations in terms of various high energy batteries have been carried out. In the advanced batteries, lithium secondary batteries using intercalation compounds as the cathode and lithium metal or carbon materials as the anode have been studied intensively because of both their high voltage and their large capacity. The aim of this Grant-in-Aid for Co-operative Research (A) is to disign and to construct a new reactive field on each electrodes and to develop new materials for advanced secondary batteries.On the total meeting of this co-operative research, there was fruitful discussion related to the following aspects,Elemental materialscathode spinel type oxide, lithium vanadium oxide and lithium nickel oxideanode carbon and Li_3Nelectrolyte sydnon-ether mixed solventpolymer electrolytealumino-silicate glass solid electrolyteElectrochemical and surface analysisdiffusion coefficient by potential-step chrono-amperometryRaman spectra for the anode materialCrystal structure and physical propertiesX-ray and Neutron diffractionelectric conductivitymagnetic susceptibilityFrom the obtained results in this co-operative research, a relationship between energy density and cycle life for the lithium secondary battery was pointed out. This discussion will considerably contribute to the improvement of the performance of secondary batteries. Also, many problems have to be solves were proposed. Therefore, this kind of co-operative research will be much important in the future.