Electrode for solid-state batteries and method of preparing the electrode, solid-state battery containing the electrode, and bonding film used for preparing the electrode

A solid-state battery comprising:

• a positive electrode comprising a positive electrode active material;
• a negative electrode comprising a negative electrode active material;
• and a solid electrolyte layer disposed between the positive electrode and the negative electrode, wherein at least one of the positive electrode and the negative electrode comprises:
• a current collecting member;
• an electrode layer bound on the current collecting member;
• and a bonding layer interposed between the electrode layer and the current collecting member, and bound to the electrode layer, wherein the electrode layer comprises:
• a solid electrolyte;
• an electrode layer binder which is inactive to the solid electrolyte;
• and an electrode active material, wherein the bonding layer comprises:
• a first binder which is inactive to the solid electrolyte;
• a second binder which has a stronger bonding strength to the current collecting member than a bonding strength of the first binder to the current collecting member;
• where the first binder and the second binder are intermixed where both the first binder and the second binder contact the current collecting member;
• a bonding layer conductive material, wherein the first binder of the bonding layer binds with the electrode layer;
• wherein the first binder is present in a range from about 3 wt % to about 30 wt % and the second binder is present in a range from about 2 wt % to about 20 wt % with respect to a total weight of the bonding layer.

A bonding film for a solid-state battery comprises:

• a first binder which is inactive to a solid electrolyte of an electrode layer of the solid- state battery;
• a second binder which has a stronger bonding strength to a current collecting member of the solid-state battery than a bonding strength of the first binder to the current collecting member;
• where the first binder and the second binder are intermixed where both the first binder and the second binder contact the current collecting member;
• a bonding layer conductive material, wherein the bonding film is bound to the electrode layer comprising the solid electrolyte, a binder, which is inactive to the solid electrolyte, and an electrode active material, and the bonding film is interposed between the electrode layer and the current collecting member of the solid-state battery, wherein the first binder binds with the electrode layer;
• wherein the first binder is present in a range from about 3 wt % to about 30 wt %, and the second binder is present in a range from about 2 wt % to about 20 wt % with respect to a total weight of the bonding layer.