Method of manufacturing a solid state battery and solid state battery

1. A method of manufacturing a solid state battery, comprising:

providing a first solid state electrolyte membrane layer;

applying an electronically conductive matrix to the cathode side of the first solid state electrolyte membrane layer;

building up a cathode layer on a cathode side of the first solid state electrolyte membrane layer; and

applying an anode layer to an anode side of the first solid state electrolyte membrane layer,

wherein the cathode layer has a greater elasticity than the first solid state electrolyte membrane layer, and a modulus of elasticity of the cathode layer is lower than a modulus of elasticity of the first solid state electrolyte membrane layer, and

wherein the conductive matrix is designed as a grid, and the grid has a width of the size of the active material particles.

2. The method according to claim 1 , further comprising applying a second solid state electrolyte membrane layer to the cathode side of the first solid state electrolyte membrane layer.

3. The method according to claim 2 ,

wherein applying the anode layer comprises applying a third solid state electrolyte membrane layer to the first solid state electrolyte layer,

wherein the second solid state electrolyte membrane layer is arranged between the first solid state electrolyte layer and the anode layer, and

wherein the third solid state electrolyte membrane layer uses the same solid state electrolyte material as the second solid state electrolyte membrane layer.

4. The method according to claim 2 , wherein the second solid state electrolyte membrane layer has a greater elasticity than the first solid state electrolyte membrane layer, and the modulus of elasticity of the second solid state electrolyte membrane layer is lower than the modulus of elasticity of the first solid state electrolyte membrane layer.

5. The method according to claim 1 , wherein the cathode layer is built up in several layers in several cycles of a spray coating-drying method using a solution which comprises solid state electrolyte material and active material particles.

6. The method according to claim 5 , wherein the layer thickness of each cathode layer corresponds to the size of the active material particles and is in a range between 5 and 10 μm.

7. The method according to claim 5 , wherein an electronically conductive matrix is arranged between each pair of cathode layers.

8. The method according to claim 1 , wherein the active material particles are provided with a protective layer, and the protective layer comprises a LiNbO 3 layer.

9. A solid state battery that is produced by a method according to claim 1 , comprising:

a first solid state electrolyte membrane layer;

an electronically conductive matrix on a cathode side of the first solid state electrolyte membrane layer;

a cathode layer on the cathode side of the first solid state electrolyte membrane layer;

an anode layer on an anode side of the first solid state electrolyte membrane layer,

wherein the cathode layer has a greater elasticity than the first solid state electrolyte membrane layer, and a modulus of elasticity of the cathode layer is lower than a modulus of elasticity of the first solid state electrolyte membrane layer, and

wherein the conductive matrix is designed as a grid, and the grid has a width of the size of the active material particles.