Electrode active materials and all-solid-state batteries

Abstract

The present invention provides an electrode active material that achieves high rate and high cycle characteristics, is easy to sinter together with a solid electrolyte, and can achieve a high volumetric specific capacity, as well as an all-solid-state battery using the electrode active material. [Solution] The electrode active material is Al2Nb 50-x M x O 128 It is represented by the compositional formula, where x is 0

Claims

1. Al ２ Nb ５０－ｘ M ｘ O １２８ An electrode active material comprising a negative electrode active material represented by the composition formula, wherein x satisfies 0 < x < 20 and M is a transition metal element with a valency of 5 or higher.

2. The electrode active material according to claim 1, wherein x satisfies 3 ≤ x.

3. The electrode active material according to claim 1, wherein x satisfies 5 ≤ ​​x.

4. The electrode active material according to claim 1, wherein x satisfies x ≤ 18.

5. The electrode active material according to claim 1, wherein x satisfies 5 ≤ ​​x ≤ 15.

6. The electrode active material according to claim 1, wherein the electrode active material contains 80% by volume or more of the negative electrode active material.

7. The electrode active material according to any one of claims 2 to 5, wherein M is Ta.

8. The electrode active material according to claim 1, wherein the electrode active material is a powder material before firing.

9. The electrode active material according to claim 1, wherein when X-ray diffraction analysis is performed on the electrode active material, a peak appears at 25.3° to 25.7°.

10. The electrode active material according to claim 9, wherein when X-ray diffraction analysis is performed on the electrode active material, the magnitude of the X-ray diffraction intensity in the range of 25.8° to 26.1° is 1 / 15 or less of the magnitude of the X-ray diffraction intensity in the range of 25.3° to 25.7°.

11. Oxide-based solid electrolyte layer, A first electrode layer containing a positive electrode active material is provided on the first main surface of the oxide-based solid electrolyte layer, A solid-state battery comprising a second electrode layer provided on the second main surface of the oxide-based solid electrolyte layer and containing the electrode active material described in claim 1 or claim 9.

Images