Structure and physical property of Lithium intercalation materials

重点介绍了锂离子电池电极材料的基础方面。为了提高锂离子电池的性能和设计新的锂离子电池体系，本文从以下几个方面阐明了结构与性能的关系：本文研究了层状岩盐结构的过渡金属氧化物LiMO_2（M-Ni，Co，Ni_<l-y>Co_y）作为锂离子电池的插入电极。已知在烧结过程中产生的锂和过渡金属位点的无序影响磁性和电化学性质。本研究利用中子衍射和SQUID测量研究了Li_（1-x）（Ni_<l-y>Co_y）_（1+ x）O_2（x：无序度）样品的磁性和电化学性质与无序度的关系。自旋玻璃化转变温度（Tg）随着掺杂量的增加而升高。放电容量也随温度的降低而增加。这些结果表明， ...更多信息 为了设计理想的锂离子电池电极界面，我们尝试用脉冲激光沉积法制备LiNiO_2和LiCoO_2单晶薄膜。LiMn_2O_4在高温充放电循环过程中的劣化是制约其作为锂电池电极应用的一个严重问题。对不同条件下合成的锂锰氧化物尖晶石粉体进行了高温贮存前后的中子衍射测试，并对测试结果进行了分析。结构得到完善。这些结果表明锰离子的溶解在材料的本体结构以及表面进行。氧占有率的降低也支持了高温储存导致LiMn_2O_4体结构被破坏的结论。少

We focused basic aspect of electrode materials for lithium-ion battery. To improve the characteristics and to design new lithium battery systems, we clarified the structure-property relationships for the following subjects.The transition metal oxide LiMO_2 (M-Ni, Co, Ni_<l-y>Co_y) with the layered rock salt structure has been studied as insertion electrode in rechargeable lithium ion battery. It is known that the disorder of lithium and transition metal sites produced in the sintering process affects the magnetic and electrochemical properties. In this study, we have investigated the relationships between the disorder and magnetic and electrochemical property using neutron diffraction and SQUID measurement.Li_<l-∂>(Ni_<l-y>Co_y)_<1+∂>O_2 samples(∂: extent of disorder) indicated spin-glass like behavior. The spin-glass transition temperature (Tg) shifted higher with the increase in ∂. The discharge capacity also increased with the decrease in ∂. These results indicate that the disorder … More in LiMO_2 is correlated with the magnetic and electrochemical property.In order to design the ideal interface of the lithium battery electrode, we attempted making single crystal thin film of LiNiO_2 and LiCoO_2 using the pulse laser deposition method. The epitaxial thin films of LiCoO_2 and LiNiO_2 were obtained, those orientation was controlled by the substrate orientation.The deterioration of lithium manganese oxide spinet (LiMn_2O_4) during charge-discharge cycle at high temperature is a serious defect for the practical use as a lithium battery electrode. Neutron diffraction measurement of lithium manganese oxide spinet powders synthesized under various conditions was carried out before and after the high temperature storage and the. structures were refined. These results suggest dissolution of manganese ion proceeds at bulk structure as well the surface of the material. The decrease in occupancy of oxygen also supports the conclusion that the bulk structure of LiMn_2O_4 is broken by high temperature storage. Less