Secondary battery having bending structure and method for manufacturing same

A secondary battery comprising a positive electrode, a solid electrolyte, and a negative electrode, wherein

• the positive electrode comprises a compound of copper, phosphorus, and sulfur;
• the solid electrolyte comprises bacterial cellulose having chitosan bound thereto;
• a chitosan content in the solid electrolyte is more than 30 wt % and less than 70 wt %;
• a stack structure having the positive electrode and the solid electrolyte stacked together is provided;
• the stack structure is bent to provide a bending region therebetween;
• and
• the negative electrode is provided within the bending region.