Positive-electrode material and battery
View Patent ↗A positive-electrode material includes a positive-electrode active material and a coating layer coating at least partially the surface of the positive-electrode active material and containing a first solid electrolyte. The first solid electrolyte is represented by Composition formula (1): Li α1 M1 β1 X1 γ1 . . . Formula (1) where, in Composition formula (1), α1, β1, and γ1 are each independently a positive real number, M1 includes calcium, yttrium, and at least one rare-earth element other than yttrium, and X1 includes at least one selected from the group consisting of F, Cl, Br, and I.
1 . A positive-electrode material comprising:
a positive-electrode active material;
a coating layer coating at least partially a surface of the positive-electrode active material and containing a first solid electrolyte; and
a second solid electrolyte,
wherein the first solid electrolyte is represented by Composition formula (2) below,
Li 6-2a-3d Ca a (Y 1-b Gd b ) d Br 6-c Cl c Formula (2)
where
Composition formula (2) above satisfies
0< a,
0< b< 1,
0< c< 6, and
0< d< 1.5.
2 . The positive-electrode material according to claim 1 ,
wherein Composition formula (2) above satisfies 0.01≤a≤0.3.
3 . The positive-electrode material according to claim 2 ,
wherein Composition formula (2) above satisfies a≤0.2.
4 . The positive-electrode material according to claim 1 ,
wherein Composition formula (2) above satisfies 0.1≤b≤0.9.
5 . The positive-electrode material according to claim 1 ,
wherein Composition formula (2) above satisfies 0.8≤b<1.
6 . The positive-electrode material according to claim 1 ,
wherein Composition formula (2) above satisfies 1.0≤c≤1.2.
7 . The positive-electrode material according to claim 1 , wherein the second solid electrolyte is represented by Composition formula (3) below,
Li α2 M2 β2 X2 γ2 Formula (3)
where,
in Composition formula (3) above,
α2, β2, and γ2 are each independently a positive real number,
M2 includes at least one element selected from the group consisting of metallic elements other than Li and metalloid elements, and
X2 includes at least one selected from the group consisting of F, Cl, Br, and I.
8 . The positive-electrode material according to claim 7 ,
wherein M2 includes yttrium.
9 . The positive-electrode material according to claim 7 ,
wherein Composition formula (3) above satisfies 2.5≤α2≤3, 1≤β2≤1.1, and γ2=6.
10 . The positive-electrode material according to claim 7 ,
wherein X2 includes at least one selected from the group consisting of Cl and Br.
11 . The positive-electrode material according to claim 7 ,
wherein the second solid electrolyte contains Li 3 YBr 2 Cl 4 .
12 . The positive-electrode material according to claim 1 ,
wherein the second solid electrolyte contains a sulfide solid electrolyte.
13 . A battery comprising:
a positive electrode containing the positive-electrode material according to claim 7 ;
a negative electrode; and
an electrolyte layer disposed between the positive electrode and the negative electrode.
14 . A positive-electrode material comprising:
a positive-electrode active material; and
a coating layer coating at least partially a surface of the positive-electrode active material and containing a first solid electrolyte,
wherein the positive-electrode active material contains Ni, Co, and Mn, and
wherein the first solid electrolyte is represented by Composition formula (2) below,
Li 6-2a-3d Ca a (Y 1-b Gd b ) d Br 6-c Cl c Formula (2)
where
Composition formula (2) above satisfies
0< a,
0< b< 1,
0 <c< 6, and
0< d< 1.5.