| 摘要 |
PROBLEM TO BE SOLVED: To attain a positive electrode active material with little toxicity and at a low cost by using iron oxide having a tunnel structure which is capable of taking either of a tetragonal system or a monoclinic system which involves specific grating parameter. SOLUTION: This compound has Fe1- XMeXOOHClZ provided with tunnel structure having (2×2) channel, where Me represents Ni, Co, Zn, Cu, Al, Mg, Ca, B...; 0<=X<=1, 0<=Z. The grating parameter of a tetragonal system the phase has expressions: a=10.54±0.2Å, and c=3.03±0.2Å, whereas the grating parameter of a monoclinic system phase has expressions: a=10.60±0.2Å, b=3.03±0.2Å, c=10.51±0.2Å, and β=90.22±2 deg.. Lithium can be contained in a large channel of (2×2) type. If Fe is replaced by the metal of Ni, Co, Zn, B or the like, repeated reversibility is improved. For adjustment of this material, only water is used for the hydrolysis processing of a material whose base material is iron chloride or iron. |
