Positive electrode material for non-aqueous electrolyte...

Details Positive electrode material for non-aqueous electrolyte... Positive electrode material for non-aqueous electrolyte...

2011-07-05

2011-07-05

Ridley, Basia (Department: 1725)

Chemistry: electrical current producing apparatus, product, and

Current producing cell, elements, subcombinations and...

Electrode

C429S218100, C429S220000, C429S223000, C429S231900, C429S231950

Reexamination Certificate

active

07972729

ABSTRACT:
The invention includes, as a positive electrode material, active material particles comprising a lithium-containing manganese oxide represented by the general formula: Li1+aMn2−x−aMxO4+ywhere M is a transition metal element other than Mn, 0<x≦0.5, −0.2≦y≦0.5, and 0≦a≦0.33. The molar ratio A of M to the total of Mn and M in the surface of the active material particles and the molar ratio B of M to the total of Mn and M in the whole active material particles satisfy the relations: A/B>1.0 and A≧0.3. In an X-ray diffraction analysis using CuKa radiation as an X-ray source, the intensity ratio of the largest peak of peaks attributed to an oxide of the transition metal element M to a peak around 2θ=36.4° is 0.25 or less.

REFERENCES:
patent: 6344294 (2002-02-01), Torata et al.
patent: 2001/0031397 (2001-10-01), Kweon et al.
patent: 2007/0082266 (2007-04-01), Waki et al.
patent: 10-172571 (1998-06-01), None
patent: 11-071115 (1999-03-01), None

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