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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。层状岩盐氧化物LiMO_2 M=Co和/或Ni的氧化物LiMO_2是有前途的正极材料。然而，提取和重新插入Li的能力关键取决于Li和M原子在结构的交替平面中的化学计量和排序。 Li的撤出产生相对于原子位移亚稳定的Li_<1-X>MO_2组合物，并且在Li提取时M原子向Li层的位移急剧降低了Li层中的Li+离子迁移率。我们首先研究了Li_<1-y>NiO_2体系的合成和脱嵌过程对阳离子化学计量程度、有序性和有序相稳定性的影响。我们阐明了（a）Li-Ni-O三元系统中的相关系，以优化Li_<1-X>NiO_2阴极系统的性能，（b）精确控制起始锂化化合物中的化学计量和阳离子顺序的合成条件，（c）在较高温度下与Li浓度相对应的分解或无序过程，（d）化学计量、顺序、和物理性质，(e)脱嵌引起的晶格变化，(f)阳离子无序对脱嵌过程的影响。 2．新的氧化物主体。我们尝试通过离子交换、高压、高氧压等非常规途径合成新的氧化物主体。 LiFeO_2在层状岩盐结构中不结晶，而NaFeO_2却在层状岩盐结构中结晶；通过在熔融LiCl/KCl中进行Li+与Na+的离子交换，可以制备具有层状岩盐结构的亚稳态LiFeO_2。此外，我们合成了具有锯齿状层状结构的新型正极LiFeO_2。我们阐明了层状结构和锯齿状层状结构的LiFeO_2正极的结构和电化学性能。