Solid electrolytes and batteries

Claims

1. It is a solid electrolyte, The first element group consists of one or more alkali metal elements selected from the group consisting of Li, Na, and K, A second group of elements, selected from metallic and metalloid elements, which form one or more trivalent cations, A third group of elements consisting of one or more halogen elements selected from the group consisting of F, Cl, Br, and I, Hydroxyl group, Includes, A solid electrolyte in which the diffraction pattern measured using an X-ray diffractometer with CuKα rays shows peaks in the ranges of 2θ 21–24°, 32–34°, and 35.5–37.5°.

2. A solid electrolyte according to claim 1, The second group of elements is a solid electrolyte containing Al or Ga.

3. A solid electrolyte according to claim 1, A solid electrolyte in which, among metallic elements and metalloid elements excluding alkali metal elements, the elements included in the second group of elements are present in an amount of 50 mol or more.

4. A solid electrolyte according to claim 2, A solid electrolyte in which the second group of elements includes Al.

5. A solid electrolyte, The first element group consists of one or more alkali metal elements selected from the group consisting of Li, Na, and K, A second group of elements, selected from metallic and metalloid elements, which form one or more trivalent cations, A third group of elements consisting of one or more halogen elements selected from the group consisting of F, Cl, Br, and I, Hydroxyl group, Includes, The second group of elements includes Al, The first group of elements includes Li, and in the Raman spectrum, at 470 cm⁻¹ －１ More than 570cm －１ The following and 720 cm －１ 820cm or more －１ The following solid electrolytes exhibit peaks.

6. A solid electrolyte, The first element group consists of one or more alkali metal elements selected from the group consisting of Li, Na, and K, A second group of elements, selected from metallic and metalloid elements, which form one or more trivalent cations, A third group of elements consisting of one or more halogen elements selected from the group consisting of F, Cl, Br, and I, Hydroxyl group, Includes, The second group of elements includes Al, A solid electrolyte in which 60 mol% or more of Al has a coordination number of 4.

7. A solid electrolyte according to any one of claims 1 to 6, The third group of elements is a solid electrolyte containing F or Cl.

8. A solid electrolyte according to any one of claims 1 to 6, When the first group of elements is represented as Mα, the second group of elements as Mβ, and the third group of elements as X, the composition formula is Mα ａ Mβ ｂ X ｃ (OH) ｄ It is represented as, a + 3 × b = c + d, 2.7<a<3.3, 0 < b < 1, 0 < c < 6, and, 0 < d < 6, A solid electrolyte that fills the space.

9. A solid electrolyte according to claim 5 or 6, A solid electrolyte in which, among metallic elements and metalloid elements excluding alkali metal elements, the elements included in the second group of elements are present in an amount of 50 mol or more.

10. A solid electrolyte according to claim 5 or 6, A solid electrolyte in which the diffraction pattern measured using an X-ray diffractometer with CuKα rays shows peaks in the ranges of 2θ 21–24°, 32–34°, and 35.5–37.5°.

11. A solid electrolyte according to claim 4, 5, or 6, A solid electrolyte in which, in the diffraction pattern measured using an X-ray diffractometer employing CuKα rays, there are no peaks in the range of 2θ from 24 to 26°.

12. It is a battery, Positive electrode and, The negative electrode and, A solid electrolyte layer is provided between the positive electrode and the negative electrode, Equipped with, A battery in which the solid electrolyte according to any one of claims 1 to 6 is included in at least one of the positive electrode, the negative electrode, and the solid electrolyte layer.