Electrolyte membrane for all-solid-state battery and all-solid-state battery comprising same
The present disclosure relates to a solid electrolyte membrane for suppressing the growth of lithium dendrites and an all-solid-state battery comprising the same, the solid electrolyte membrane comprising a solid electrolyte material and metal particles, wherein the metal particles form an alloy with lithium.
1. A solid electrolyte membrane for an all-solid-state battery, comprising a guide layer,
wherein the solid electrolyte membrane comprises at least one solid electrolyte film and metal particles, wherein the solid electrolyte film comprises a solid electrolyte material, and the metal particles can form an alloy with lithium during operation of the battery,
wherein the guide layer is coated at a ratio of 5% to 80% based on 100% of a surface area of the solid electrolyte film,
wherein the guide layer is disposed in a layer shape within the solid electrolyte membrane,
wherein the guide layer is disposed at a predetermined depth in the solid electrolyte membrane based on the thickness direction, and the metal particles are dispersed and distributed along the guide layer; and
wherein the solid electrolyte membrane comprises at least one selected from the group consisting of Au, Ag, Pt, Mg, Ni and Bi as the metal particles.
2. The solid electrolyte membrane for an all-solid-state battery according to claim 1 , wherein the metal particles have Li metal nucleation overpotential of 100 mV or less.
3. The solid electrolyte membrane for an all-solid-state battery according to claim 1 , wherein the guide layer is 1 nm to 1,000 nm in thickness.
4. The solid electrolyte membrane for an all-solid-state battery according to claim 1 , wherein the solid electrolyte material comprises a polymer-based solid electrolyte material.
5. The solid electrolyte membrane for an all-solid-state battery according to claim 4 , wherein the polymer-based solid electrolyte material comprises a polymer resin and a lithium salt, and exhibits ionic conductivity of 1×10 −7 S/cm or above.
6. The solid electrolyte membrane for an all-solid-state battery according to claim 1 , wherein the metal particles have a particle size of 1 nm to 5 μm.
7. The solid electrolyte membrane for an all-solid-state battery according to claim 1 , wherein the metal particles are present in an amount of 0.1 wt % to 20 wt % based on 100 wt % of the solid electrolyte membrane.
8. An all-solid-state battery comprising the solid electrolyte membrane according to claim 1 .
9. The all-solid-state battery according to claim 8 , wherein the all-solid-state battery comprises a negative electrode comprising a lithium metal as a negative electrode active material or a current collector with no negative electrode active material.
10. The all-solid-state battery according to claim 8 , wherein the all-solid-state battery comprises a negative electrode, a positive electrode and the solid electrolyte membrane,
the solid electrolyte membrane is interposed between the negative electrode and the positive electrode,
at least one of the negative electrode and the positive electrode comprises a solid electrolyte material, and
the solid electrolyte material comprises at least one of a polymer-based solid electrolyte, an oxide-based solid electrolyte and a sulfide-based solid electrolyte.