Coated active material and lithium solid state battery
The problem of the present invention is to provide a coated active material having a soft coating layer and capable of improving a contact area. The present invention solves the above-mentioned problem by providing a coated active material comprising a cathode active material and a coating layer for coating the above-mentioned cathode active material, containing an Li ion conductive oxide, wherein the above-mentioned coating layer further contains lithium carbonate.
1. A coated active material comprising a cathode active material in a particle shape and a coating layer for coating the cathode active material, containing a Li ion conductive oxide,
wherein the coating layer further contains lithium carbonate, and
a content of the lithium carbonate is within a range of 0.02% by weight to 1% by weight with respect to the coated active material.
2. The coated active material according to claim 1 , wherein the Li ion conductive oxide is at least one of Li 4 SiO 4 —Li 3 BO 3 and LiNbO 3 .
3. The coated active material according to claim 1 , wherein the cathode active material is an oxide cathode active material.
4. A lithium solid state battery comprising a cathode active material layer containing a cathode active material, an anode active material layer containing an anode active material, and a solid electrolyte layer formed between the cathode active material layer and the anode active material layer;
wherein the cathode active material is the coated active material according to claim 1 .
5. The lithium solid state battery according to claim 4 , wherein the coated active material contacts with a sulfide solid electrolyte material.
6. The coated active material according to claim 1 , wherein a coverage factor of the coating layer on a surface of the cathode active material is 50% or more.
7. The coated active material according to claim 1 , wherein the content of the lithium carbonate with respect to the coated active material is within the range of 0.3% by weight to 0.8% by weight.