Secondary battery

A secondary battery comprising:

• a positive electrode comprising:
• a positive electrode current collector, and
• a positive electrode active material layer located on the positive electrode current collector and comprising a positive electrode active material, a positive electrode conductive material, and a positive electrode binder, wherein the positive electrode active material layer is formed by a dry process,
• wherein the positive electrode binder is fiberized and binds the positive electrode active material and the positive electrode conductive material;
• a negative electrode comprising:
• a negative electrode current collector, and
• a negative electrode active material layer located on the negative electrode current collector and comprising a plurality of granules comprising a negative electrode active material and a negative electrode binder, wherein the plurality of granules is formed by a spray-drying process,
• wherein the plurality of granules have a structure in which the negative electrode binder binds the negative electrode active material,
• wherein the granule comprised in the negative electrode has:
• a core part comprising the negative electrode active material;
• and a surface part located wholly or partially outside the core part and comprising the negative electrode binder binding the negative electrode active material, and
• a separator disposed between the positive electrode and the negative electrode.