| 摘要 |
The present invention provides a transition metal phosphate and a sodium secondary battery. The transition metal phosphate contains Na, P and M where M represents one or more elements selected from the group consisting of transition metal elements, wherein a value of I/I0 determined by the following powder X-ray diffraction measurement is 0.6 or less: the powder X-ray diffraction measurement is a method in which an X-ray diffraction pattern is produced by delivering a Cu Kα ray to a mixture composed of the transition metal phosphate and silicon in a transition metal phosphate:silicon weight ratio of 8:1, and then a value of I/I0 is determined by dividing I by I0 where I is the intensity of a maximum peak of the transition metal phosphate and I0 is the intensity of the maximum peak of the silicon in the X-ray diffraction pattern. |
