Positive electrode material and battery
View Patent ↗A positive electrode material includes a coated active material including a positive electrode active material and a coating layer and a first solid electrolyte. The coating layer contains a second solid electrolyte and covers at least a portion of a surface of the positive electrode active material. The first solid electrolyte is represented by the following Formula (1): Li α1 M1 β1 X1 γ1 Formula (1) where α1, β1, and γ1 each independently represent a positive real number; M1 includes calcium, yttrium, and at least one rare earth element other than yttrium; X1 includes at least one selected from the group consisting of F, Cl, Br, and I. The second solid electrolyte is softer than the first solid electrolyte.
1 . A positive electrode material comprising:
a coated active material including a positive electrode active material and a coating layer, and
a first solid electrolyte,
wherein the coating layer contains a second solid electrolyte and covers at least a portion of a surface of the positive electrode active material,
the first solid electrolyte is represented by the following Formula (2):
Li 6−2a−3d Ca a (Y 1−b Gd b ) d Br 6−c Cl c Formula (2)
wherein Formula (2) satisfies 0<a<0.75, 0.8≤b<1, 0<c<6, and 0<d<1.5, and
the Young's modulus of the second solid electrolyte is lower than the Young's modulus of the first solid electrolyte.
2 . The positive electrode material according to claim 1 ,
wherein Formula (2) satisfies 0.01≤a≤0.3.
3 . The positive electrode material according to claim 2 ,
wherein Formula (2) satisfies a≤0.2.
4 . The positive electrode material according to claim 1 ,
wherein Formula (2) satisfies 0.8≤b≤0.9.
5 . The positive electrode material according to claim 1 ,
wherein Formula (2) satisfies 1.0≤c≤1.2.
6 . The positive electrode material according to claim 1 ,
wherein the Young's modulus of the second solid electrolyte is less than or equal to 40 GPa.
7 . The positive electrode material according to claim 1 ,
wherein the second solid electrolyte is represented by the following Formula (3);
Li δ1 M2 ε1 X2 ζ1 Formula (3)
where δ1, ε1, and ζ1 each independently represent a positive real number,
M2 includes at least one element selected from the group consisting of semimetal elements and metal elements other than Li, 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 the second solid electrolyte is represented by the following Formula (4):
Li 3−3e Y 1+e Cl 6−f−g Br f I g Formula (4)
wherein Formula (4) satisfies −1<e<1, 0≤f≤6, 0≤g≤6, and (f+g)≤6.
9 . The positive electrode material according to claim 8 ,
wherein Formula (4) satisfies 2≤f≤3 and g=0.
10 . The positive electrode material according to claim 8 ,
wherein Formula (4) satisfies f=0 and g=0.
11 . The positive electrode material according to claim 8 ,
wherein Formula (4) satisfies 0≤e≤0.1.
12 . The positive electrode material according to claim 1 ,
wherein the positive electrode active material contains Ni, Co, and one of Mn or Al.
13 . A battery comprising:
a positive electrode containing the positive electrode material according to claim 1 ;
a negative electrode; and
an electrolyte layer disposed between the positive electrode and the negative electrode.
14 . A positive electrode material comprising:
a coated active material including a positive electrode active material and a coating layer; and
a first solid electrolyte,
wherein the coating layer contains a second solid electrolyte and covers at least a portion of a surface of the positive electrode active material,
the first solid electrolyte is represented by the following Formula (2):
Li 6−2a−3d Ca a (Y 1−b Gd b ) d Br 6−c Cl e Formula (2)
wherein Formula (2) satisfies 0<a<0.75, 0<b<1, 1.0≤c≤1.2, and 0<d<1.5, and
the Young's modulus of the second solid electrolyte is lower than the Young's modulus of the first solid electrolyte.
15 . A battery comprising:
a positive electrode containing the positive electrode material according to claim 14 ;
a negative electrode; and
an electrolyte layer disposed between the positive electrode and the negative electrode.