| 摘要 |
In a nonaqueous electrolyte secondary battery and an active material for a nonaqueous electrolyte secondary battery, the nonaqueous electrolyte secondary battery includes: a positive electrode containing a positive-electrode active material; a negative electrode containing a negative-electrode active material; and a nonaqueous electrolyte, wherein molybdenum dioxide whose particles have an average aspect ratio of two or less is used as the positive-electrode active material or the negative-electrode active material where the aspect ratio is the ratio between the major axis length and the minor axis length of a particle-equivalent ellipse equivalent to the cross-sectional area or the two-dimensional projection image of each of the observed particles (major axis length/minor axis length), the particle-equivalent ellipse being an ellipse having the same area and the same first and second moments as the observed particle. |
