Structure and physical property of Lithium intercalation materials

重点介绍了锂离子电池电极材料的基本方面。为了改善锂离子电池的性能和设计新的锂电池体系，本论文对具有层状岩盐结构的过渡金属氧化物LiMo_2(M-Ni，Co，Ni_&lt；L-y&gt；Co_y；Co_y)作为二次锂离子电池的插入电极进行了研究。众所周知，在烧结过程中产生的锂和过渡金属位的无序影响了材料的磁性和电化学性能。在这项研究中，我们用中子衍射和SQUID measurement.Li_&lt；l-∂&gt；(Ni_&lt；l-y&gt；Co_y)_&lt；1+∂&gt；O_2样品(∂：无序度)研究了无序性与磁性和电化学性质之间的关系。自旋玻璃化转变温度(Tg)随∂的增加而升高。放电容量也随着∂的降低而增加。这些结果表明，…障碍为了设计理想的锂电池电极界面，我们尝试用脉冲激光沉积的方法制备LiNiO2和LiCoO2单晶薄膜。制备了LiCoO2和LiNiO2外延薄膜，其取向受衬底取向控制，高温充放电循环过程中锂锰氧化物尖晶石(LiMn2O4)的劣化严重影响了其作为锂电池电极的实际应用。对不同条件下合成的锂锰氧化物尖晶石粉末进行了高温储存前后的中子衍射测量。结构得到了改进。这些结果表明，锰离子的溶解在材料的体相结构和表面进行。氧占有率的下降也支持高温储存破坏了LiMn2O4的体相结构的结论。较少

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