Electrolyte sheet
An electrolyte sheet including an electrolyte layer that includes electrolyte particles and a binder, and a base material stacked on the electrolyte layer, wherein the electrolyte particles have an ionic conductivity of 1.0×10 −5 S/cm or more; the ratio of the electrolyte particles relative to the total weight of the electrolyte particles and the binder is 50 wt % or more and 99.5 wt % or less; and, after transferring the electrolyte layer in a transfer test, the electrolyte particles and the binder do not remain on the base material, and the electrolyte layer is transferred to an object without peeling.
1. A method for producing a stacked body, the method comprising:
applying an electrolyte slurry comprising sulfide-based solid electrolyte particles and a binder that is a resin having a structural unit A in a molecular skeleton to a base material, thereby to form an electrolyte layer; and
transferring the electrolyte layer to an electrode material layer and peeling off the base material from the electrolyte layer,
wherein
the electrolyte slurry has a solid matter concentration of 20 wt % or more and 90 wt % or less;
a ratio of the electrolyte particles in the solid matter is 90 wt % or more and 99.5 wt % or less; and
the base material has a peel force of 20 mN/cm or more and 1500 mN/cm or less:
where R 1 to R 4 are independently H, F, CF 3 , CH 2 CF 3 , CF 2 CF 3 , CF 2 CF 2 CF 3 , OCF 2 CF 2 CF 3 , OCF 3 or Cl, and at least one of R 1 to R 4 is F, CF 3 , CH 2 CF 3 , CF 2 CF 3 , CF 2 CF 2 CF 3 , OCF 2 CF 2 CF 3 or OCF 3 .
2. The method according to claim 1 , wherein the structural unit A is a structure derived from vinylidene fluoride, a structure derived from tetrafluoroethylene or a structure derived from hexafluoropropylene.
3. The method according to claim 1 , wherein the electrolyte particles have an average particle diameter of 5 nm or more and 50 μm or less.
4. The method according to claim 2 , wherein b in the formula (1) is 0.
5. The method according to claim 4 , wherein a:c:d in the formula (1) is (1-9):(1):(3-7).
6. The method according to claim 1 , wherein raw materials of the electrolyte particles are Li 2 S and P 2 S 5 .
7. The method according to claim 1 , wherein the electrolyte particles are glass ceramics.
8. The method according to claim 2 , wherein
b in the formula (1) is 0,
a:c:d in the formula (1) is (1-9):(1):(3-7),
raw materials of the electrolyte particles are Li 2 S and P 2 S 5 , and
the electrolyte particles are glass ceramics.
9. The method according to claim 2 , wherein
b in the formula (1) is 0,
a:c:d in the formula (1) is (1-9):(1):(3-7),
raw materials of the electrolyte particles are Li 2 S and P 2 S 5 ,
the electrolyte particles are glass ceramics, and
the structural unit A is a structure derived from vinylidene fluoride, a structure derived from tetrafluoroethylene or a structure derived from hexafluoropropylene.
10. The method according to claim 2 , wherein
b in the formula (1) is 0,
a:c:d in the formula (1) is (1-9):(1):(3-7),
raw materials of the electrolyte particles are Li 2 S and P 2 S 5 ,
the electrolyte particles are glass ceramics,
the structural unit A is a structure derived from vinylidene fluoride, a structure derived from tetrafluoroethylene or a structure derived from hexafluoropropylene, and
the electrolyte particles have an average particle diameter of 5 nm or more and 50 μm of less.
11. The method according to claim 1 , wherein the sulfide-based solid electrolytes have a composition represented by the formula (1):
Li a M b P c S d (1)
wherein in the formula (1), M is an element selected from B, Zn, Si, Cu, Ga and Ge; and
a, b, c and d are a composition ratio of each element, and satisfy a:b:c:d of 1 to 12:0 to 0.2:1:2 to 9.