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NMR and Phonon-Echo Study on the Ionic Operation of Electrode Materials of Lithium Ion Batteries

锂离子电池电极材料离子操作的核磁共振和声子回波研究

基本信息

批准号：
12640316
负责人：
KANASHIRO Tatsuo
金额：
$ 1.6万
依托单位：
The University of Tokushima
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (C)
财政年份：
2000
资助国家：
日本
起止时间：
2000 至 2001
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-12640316/
关键词：
Lithium transition metal oxide Ionic conduction NMR Spin-lattice relaxation time Lithium ion battery Chemical shift Activation energy Ionic diffusion リチウムイオン電池

项目摘要

Research results are summarized as follows. 1. Experiments(1) Sample preparation : Positive electrode material, LiCu0_2 was synthesized from Li_2O, LiOH and CuO powders. The powder of LiV_2O_5 was supplied by Bharathiar Univ. (India), LiGa by Hosei Univ. and Aomori Univ. Group, and Carbon powder by Matsushita Battery Industrial Co.,Ltd.(2) Measurements : The temperature dependence of the spin-lattice relaxation time T_1 and the line width ΔH have been measured for ^7Li in LiCoO_2, LiNiO_2, LiCuO_2 and LiV_2O_5. The chemical shift has been measured in LiCuO_2 and LiV_2O_5 by MAS-NMR. The electrical conductivity has been measured in LiCoO_2 and LiNiO_2 as a function of temperature by a four-terminal method. NMR measurement has been done for ^7Li and ^<71>Ga in β -LiGa over the temperature range of 77K〜500K.2. Results and Summary(1) We discussed about using LiNiO_2 instead of LiCoO_2 from NMR and conductivity data of both samples. Four oral presentations were given and one paper was published.(2) From the discussion about the possibility of the practical use of LiCuO_2 as the positive electrode from NMR Line width, we gave one oral report and one paper.(3) We investigated the behavior of Li^+ defects in β -LiGa by NMR measurements and discussed about the efficiency as the negative electrode. Six oral presentations were given in addition to three papers.(4) We could not observe the phonon echoes for the carbon powder. Further investigations are now being performed.

研究结果总结如下。1.实验（1）样品制备：以Li_2O、LiOH和CuO为原料，合成正极材料LiCuO_2。LiV_2O_5粉末由Bharathiar Univ.（印度）提供，LiGa由Hosei Univ.和青森大学集团提供，碳粉由松下电池工业公司提供，公司(2)测量值：测量了LiCoO_2、LiNiO_2、LiCuO_2和LiV_2O_5中^7Li的自旋-晶格弛豫时间T_1和线宽ΔH随温度的变化关系。用MAS-NMR测定了LiCuO_2和LiV_2O_5的化学位移。用四端法测量了LiCoO_2和LiNiO_2的电导率随温度的变化。在<71>77 K ~ 500 K温度范围内对β -LiGa中的^7 Li和^ Ga进行了NMR测量。结果与总结（1）从两种样品的NMR和电导率数据讨论了用LiNiO_2代替LiCoO_2的可能性。作了四次口头介绍，发表了一篇论文。(2)从核磁共振谱线宽度探讨了LiCuO_2作正极实用化的可能性，给出了一个口头报告和一篇论文。(3)我们通过核磁共振测量研究了β -LiGa中Li^+缺陷的行为，并讨论了其作为负极的效率。除了三篇论文外，还作了六次口头介绍。(4)我们无法观察到碳粉的声子回波。目前正在进行进一步调查。