リチウムイオン2次電池正極材料の非化学量論性と磁性

概要

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Lithiated transition metal oxides have been extensively studied, since they are of scientific and commercial interest as high-density and rechargeable cathode materials. It is well known that they are non-stoichiometric compounds, and contain various kinds of defect structure. The non-stoichiometry in these compounds strongly affects their electrochemical properties, such as the redox capacity, redox potential profile, rate performance, and cycle fading. Simultaneously, it has a marked influence on their magnetic properties. In this article, the following magnetic behaviors in these compounds, which are very sensitive to the non-stoichiometry, are discussed: S= 1/2 two-dimensional triangular anti-ferromagnet LiNiO_2, exchange interactions in cation- or aniondefective spinel LiMn_2O_4, and ferromagnetic ordering in LiMn_<1.5>Ni_<0.5>O_4.
社団法人日本磁気学会の論文
2004-06-01