Positive electrode active material for secondary cell,...

Details Positive electrode active material for secondary cell,... Positive electrode active material for secondary cell,...

2005-07-12

2005-07-12

Chaney, Carol (Department: 1745)

Chemistry: electrical current producing apparatus, product, and

Current producing cell, elements, subcombinations and...

Electrode

C429S221000, C429S218100

Reexamination Certificate

active

06916578

ABSTRACT:
The positive active material for a secondary battery of the present invention is β-FeOOH containing at least one element selected from the group consisting of B, P, S, Li, Na, K, Mg, Al, Ca, Sc, Ti, V, Cr, Mn, Co, Ni, Cu, Zn, Zr, Pb and Sn which shows a diffraction peak from the (110) plane having a half width Y satisfying 0.3°<Y (2θ) when subjected to the X-ray diffractometry with the CuKα ray. A non-aqueous electrolyte secondary battery comprising as a positive active material such low-crystalline β-FeOOH exhibits an excellent cycle life performance as compared with a non-aqueous electrolyte secondary battery comprising a high-crystalline β-FeOOH as a positive active material.

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