Method of manufacturing negative electrode for all-solid-state batteries
Disclosed is a method of manufacturing a negative electrode for all-solid-state batteries, the method including (a) preparing a powder mixture including a negative electrode active material, a solid electrolyte, and a conductive agent, (b) introducing the powder mixture into a reactor, (c) introducing an electrolytic solution into the reactor, and (d) forming a solid electrolyte interface (SEI) film while rotating the reactor, wherein the inner surface of the reactor is treated with lithium metal.
1. A method of manufacturing a negative electrode for all-solid-state batteries, the method comprising:
step (a) preparing a powder mixture comprising a negative electrode active material, a solid electrolyte, and a conductive agent;
step (b) introducing the powder mixture into a reactor having its inner surface previously treated with a lithium metal, rotating the resultant reactor, and forming a first solid electrolyte interface (SEI) film;
step (c) introducing an electrolytic solution into the reactor obtained from step (b); and
step (d) forming a second solid electrolyte interface (SEI) film while rotating the reactor obtained from step (c).
2. The method according to claim 1 , wherein step (c) further comprises adding an additive.
3. The method according to claim 1 , wherein the electrolytic solution is a cyclic carbonate-based electrolytic solution.
4. The method according to claim 1 , wherein step (d) comprises heating the reactor.
5. The method according to claim 1 , further comprising washing and drying materials in the reactor after step (d).
6. The method according to claim 5 , further comprising filtering a residue using a sieve after the drying.
7. The method according to claim 1 , wherein the solid electrolyte is an oxide-based solid electrolyte, a sulfide-based solid electrolyte, or a polymer-based solid electrolyte.
8. The method according to claim 1 , wherein
the second SEI film comprises a main product and a by-product, and
the main product consists of an organic material comprising lithium, and the main product is stably maintained in a state of being attached to the negative electrode active material.
9. The method according to claim 2 , wherein the additive is at least one selected from the group consisting of vinyl carbonate, vinyl ethylene carbonate, fluoroethylene carbonate, and succinonitrile.
10. The method according to claim 4 , wherein the reactor is heated to maintain in a temperature of 45° C. to 70° C.