Electrode manufacturing method, electrode, and secondary battery

An electrode having a laminated body comprising an insulating layer laminated on an electrode active material layer,

• wherein a ratio (t/Rz) of a thickness value of the insulating layer to a surface roughness Rz value of the electrode active material layer is at least 2,
• the surface roughness Rz value being a ten point average roughness as measured in accordance with JIS B0601 1994.

A method for manufacturing a secondary battery having a positive electrode, a negative electrode, and an insulating layer laminated between the positive electrode and the negative electrode, said method comprising:

• a step of laminating an insulating layer on an electrode active material layer of one of the positive electrode and the negative electrode,
• the insulating layer having a thickness value of at least twice a surface roughness Rz value of the electrode active material layer,
• the surface roughness Rz value being a ten point average roughness as measured in accordance with JIS B0601 1994.

A secondary battery having a positive electrode, a negative electrode, and an insulating layer laminated between the positive electrode and the negative electrode, at least one of the positive electrode and the negative electrode having an insulating layer on an electrode active material layer formed on a surface of the electrode facing the other electrode,

• wherein the electrode having the insulating layer has a thickness value of the insulating layer and a surface roughness Rz value such that a ratio (t/Rz) of the thickness value to the surface roughness Rz value is at least 2.