| 摘要 |
PROBLEM TO BE SOLVED: To provide a positive electrode active material with high density in active material, excellent cycle characteristics, low cost, and low environmental load, and a nonaqueous electrolyte secondary battery using the same. SOLUTION: As a positive electrode active material for a secondary battery, β-FeOOH is used with aspect ratio of particles of not more than 5, and with half-value width Y of 0.30 <Y(2θ) showing a (110) face diffraction peak with an X-ray diffraction method using a CuKα beam. |
