All-solid-state battery
A main object of the present disclosure is to provide an all-solid-state battery with an excellent capacity durability. The present disclosure achieve the object by providing an all-solid-state battery comprising: a cathode active material layer, an anode active material layer, and a solid electrolyte layer formed between the cathode active material layer and the anode active material layer; wherein at least one of the cathode active material layer and the anode active material layer contains a sulfide solid electrolyte and a conductive auxiliary material; the conductive auxiliary material includes a carbon material C 1 having a carboxyl group on its surface; and a weight ratio of the carboxyl group to overall of the carbon material C 1 is 8 weight % or more.
1. An all solid battery comprising: a cathode active material layer, an anode active material layer, and a solid electrolyte layer formed between the cathode active material layer and the anode active material layer;
wherein at least one of the cathode active material layer and the anode active material layer contains a sulfide solid electrolyte and a conductive auxiliary material;
the conductive auxiliary material includes a carbon material C 1 having a carboxyl group on its surface; and
a weight ratio of the carboxyl group to overall of the carbon material C 1 is 8 weight % or more.
2. The all solid battery according to claim 1 , wherein the conductive auxiliary material further contains a cup-stacked-type carbon nanofiber as a carbon material C 2 .
3. The all solid battery according to claim 1 , wherein the anode active material layer contains a metal active material, the sulfide solid electrolyte, and the conductive auxiliary material.
4. The all solid battery according to claim 3 , wherein the metal active material includes a Si element.