Positive electrode material including positive electrode active material and solid electrolyte and battery containing the same

A positive electrode material comprising:

• a positive electrode active material;
• and
• a first solid electrolyte material, wherein:
• the first solid electrolyte material is represented by one of the following chemical formulae:
• Li3−3δ+aY1+δ−aMeaCl6−x−yBrxIy (A4)
• where Me represents at least one element selected from the group consisting of Mg, Ca, Sr, Ba, and Zn, and
• −1<δ<2, 0<a<3, 0<(3−3δ+a), 0<(1+δ−a), 0≤x≤6, 0≤y≤6, and (x+y)≤6 are satisfied;
• Li3−3δY1+δ−aMeaCl6−x−yBrxIy (A5)
• where Me represents at least one element selected from the group consisting of Al, Sc, Ga, and Bi, and −1<δ<1, 0<a<2, 0<(1+δ−a), 0≤x≤6, 0≤y≤6, and (x+y)≤6 are satisfied;
• Li3−3δ−aY1+6−aMeaCl6−x−yBrxIy (A6)
• where Me represents at least one element selected from the group consisting of Zr, Hf, and Ti and −1<δ<1, 0<a<1.5, 0<(3−3δ−a), 0<(1+δ−a), 0≤x≤6, 0≤y≤6, and (x+y)≤6 are satisfied;
• or
• Li3−3δ−2aY1+δ−aMeaCl6−x−yBrxIy (A7)
• where Me represents at least one element selected from the group consisting of Ta and Nb, and −1<δ<1, 0<a<1.2, 0<(3−3δ−2a), 0<(1+δ−a), 0≤x≤6, 0≤y≤6, and (x+y)≤6 are satisfied, and
• a ratio of a volume of the positive electrode active material to a sum of the volume of the positive electrode active material and a volume of the first solid electrolyte material is not less than 0.55 and not more than 0.85.