ALL-SOLID-STATE BATTERY, ALL-SOLID-STATE BATTERY PACK USING THE SAME, AND METHODS OF MANUFACTURING THEREOF

One embodiment of the present invention provides a secondary battery which is stable in a high-potential state and/or a high-temperature state. The secondary battery includes a positive electrode and a negative electrode, and either or both of the positive electrode and the negative electrode contains an active material and a composite compound having a crystal structure. The composite compound is used as an adhesive. In addition, the composite compound may be used as an electrolyte. The composite compound having a crystalline structure typically comprises a molecular crystal. In addition, the composite compound having a crystal structure can be obtained by mixing the first compound and the second compound while being heated at a temperature equal to or higher than the temperature at which the mixture melts.