DEVELOPMENTAL RESEARCH FOR INTERCALATION ELECTRODE MATERIALS FOR HIGH ENERGY DENSITY BATTERIES

高能量密度电池插层电极材料的开发研究

基本信息

批准号：
06555262
负责人：
KANNO Ryoji
金额：
$ 2.5万
依托单位：
KOBE UNIVERSITY
依托单位国家：
日本
项目类别：
Grant-in-Aid for Developmental Scientific Research (B)
财政年份：
1994
资助国家：
日本
起止时间：
1994 至 1995
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-06555262/
关键词：
LITHIUM BATTERY CATHODE MATERIALS LAYERED ROCKSALT CATHODE LITHIUM NICKEL OXIDES LITHIUM IRON OXIDES ZIGZAG LAYERED STRUCTURE

项目摘要

The results of our research projects are summarized as follows1. Layred-rocksalt oxides LiMO_2 Oxides LiMO_2 with M=Co and/or Ni are promising cathode materials. However, the ability to extract and reinsert Li depends critically on the stoichiometry and ordering of the Li and M atoms into alternate planes of the structure. The withdrawal of Li creates Li_<1-X>MO_2 compositions metastable relative to atomic displacements, and displacement of M atoms to the Li layrs on Li extraction lowers sharply the Li+-ion mobility in the Li layrs. We focused on the influence of synthesis and the deintercalation process on the degree of cation stoichiometry, order, and stability of the ordered phase first for the system Li_<1-y>NiO_2. We clarified (a) the phase relationships in the Li-Ni-O ternary system in order to optimize the performance of the Li_<1-X>NiO_2 cathode system, (b) the synthetic conditions that yield precise control of stoichiometry and cation order in the starting lithiated compounds, (c) the decomposition or disordering processes operative at higher temperatures versus the Li concentration, (d) the relationship between stoichiometry, order, and physical properties, (e) the lattice changes induced by deintercalation, and (f) the influence of cation disorder on the deintercalation process.2. New oxide hosts. We attempted to synthesize new oxide hosts by unconventional routes such as ion exchange, high pressure, and high oxygen pressure. LiFeO_2 does not crystallize in the layred-rocksalt structure, but NaFeO_2 does ; it was possible to prepare metastable LiFeO_2 with the layred-rocksalt structure by ion exchange of Li+ for Na+ in molten LiCl/KCl. Furthermore, we synthesized new cathode, LiFeO_2 with the zig-zag layred structure. We clarifed the structure and electrochemical properties of these LiFeO_2 cathodes with the layred structure and zig-zag layred structures.

我们的研究项目的结果总结如下1。 Layred-Rocksalt氧化物Limo_2氧化物Limo_2带有M = CO和/或Ni是有希望的阴极材料。然而，提取和重新插入li的能力取决于li和m原子的化学计量和序列化的结构。 LI的撤回会产生LI_ <1-X> MO_2相对于原子位移的组合物，并将M原子位移到Li提取的Li Layrs上的位移急剧降低了Li Layrs中的Li+-ION迁移率。我们专注于合成和去干扰过程对系统li_ <1-y> nio_2的阳离化学计量，顺序和稳定性的影响。我们澄清了（a）Li-Ni-O三元系统中的相位关系，以优化LI_ <1-X> niO_2阴极系统的性能，（b）在起始裂解的化合物中，在较高的温度下（c）在较高的温度下（c）在较高的温度下（c）在较高的温度下（c）在较高的阶段（c）中，（b）在较高的阶段（c）中，（b）的合成条件（c）li ni-o。和物理特性，（e）晶格变化是由去解剖学引起的，以及（f）阳离子障碍对去骨过程的影响。2。新的氧化宿主。我们试图通过非常规途径（例如离子交换，高压和高氧气压力）来合成新的氧化物宿主。 Lifeo_2不会在Layred-Rocksalt结构中结晶，而是Nafeo_2;可以通过在熔融licl/kcl中的li+交换li+的离子交换来制备亚稳态life_2。此外，我们将新的阴极与锯齿形结构合成了Lifeo_2。我们阐明了这些Life_2阴极的结构和电化学特性，其结构和锯齿形结构。