Negative electrode material, battery, and method for producing battery
The present disclosure provides a negative electrode material that can improve the cycle characteristics of a battery. The negative electrode material according to the present disclosure contains a reduced form of a solid electrolyte material. The solid electrolyte material is denoted by Formula (1): Li α M β X γ . Herein, in Formula (1), each of α, β, and γ is a value greater than 0, M represents at least one element selected from the group consisting of metal dements except Li and semimetals, and X represents at least one dement selected from the group consisting of F, Cl, Br, and I.
1. A negative electrode material comprising a reduced form of a solid electrolyte material,
wherein the solid electrolyte material is denoted by Formula (10) below,
Li 3−3δ−a Y 1+δ−a Me a Cl 6-x-y Br x I y Formula (10)
wherein Me represents at least one element selected from the group consisting of Zr, Hf, and Ti; and wherein
−1<δ<1,
0≤a<1.5,
0<(3−3δ−a),
0<(1+δ−a),
0≤x≤6,
0≤y≤6,
(x+y)≤6 are satisfied,
wherein a peak top is present at the value of the diffraction angle 2θ within the range of greater than θa and less than or equal to θb in an X-ray diffraction pattern of the reduced form obtained by X-ray diffraction measurement in which the Cu—Kα ray is used as a radiation source, θb is a value of the diffraction angle 2θ of the peak top of a peak reflecting the (220) face of LiX composed of Li and X, where X represents at least one element selected from the group consisting of F, Cl, Br, and I, and
θa is a value of the diffraction angle 2θ of the peak top of a peak derived from the solid electrolyte material and is a value closest to θb.
2. The negative electrode material according to claim 1 ,
wherein Me further contains zirconium.
3. The negative electrode material according to claim 1 , comprising the reduced form alone.
4. A battery comprising:
a negative electrode containing the negative electrode material according to claim 1 ;
a positive electrode; and
an electrolyte layer disposed between the negative electrode and the positive electrode.
5. The battery according to claim 4 , wherein the negative electrode is composed of the negative electrode material alone.
6. The negative electrode material according to claim 1 ,
wherein Li is occluded in the reduced form.
7. The negative electrode material according to claim 1 ,
wherein the negative electrode material contains greater than or equal to 80% by mass of the reduced form.
8. The negative electrode material according to claim 7 ,
wherein the negative electrode material consists of the reduced form.
9. A negative electrode material comprising a reduced form of a solid electrolyte material,
wherein
the solid electrolyte material is denoted by Formula (3) below,
Li d Me2 e Zr f X 6 Formula (3)
herein, in Formula (3) above,
d, e, and f satisfy d+m 2 e+3f=6 and f>0,
Me2 represents at least one element selected from the group consisting of metal elements except Li, Y, and Zr and semimetals, and
m 2 represents the valence of Me2 above.
10. A battery comprising:
a negative electrode containing the negative electrode material according to claim 9 ;
a positive electrode; and
an electrolyte layer disposed between the negative electrode and the positive electrode.