Positive electrode

A positive electrode comprising:

• a positive electrode current collector;
• and
• a positive-electrode-mixture layer which is formed on the positive electrode current collector and comprises a positive electrode active material,
• wherein the positive-electrode-mixture layer comprises first pores and second pores, the first pores having a highest abundance ratio in a pore size diameter distribution obtained by a mercury intrusion method and having a pore size diameter of D1, the second pores having a second highest abundance ratio in the pore size diameter distribution and having a pore size diameter of D2;
• the pore size diameter D1 and the pore size diameter D2 satisfy a following relationship:
• 0.03<D1/D2<0.8;
• and
• a total volume V(D1) of the first pores and a total volume V(D2) of the second pores obtained from the pore size diameter distribution satisfy a following relationship:
• 2<log V(D1)/log V(D2)<6.