Electrode manufacturing method comprising cleaning step using laser, electrode manufactured by method, and secondary battery comprising same

An electrode comprising:

• an electrode current collector;
• a top-coated electrode mixture layer;
• and
• a back-coated electrode mixture layer,
• wherein a ratio (RWa/RWb) of a weight ratio (RWa) of the back-coated electrode mixture layer to the top-coated electrode mixture layer per a unit area (1 cm×1 cm) selected from a region (boundary region) including a boundary line of the coated part, to a weight ratio (RWb) of the back-coated electrode mixture layer to the top-coated electrode mixture layer per a unit area selected from a region (central region) which does not include the boundary line of the coated part, is in a range of 0.85 to 1.15 on a basis of the top-coated electrode mixture layer and the back-coated electrode mixture layer facing each other while interposing the electrode mixture layer therebetween.

An electrode assembly comprising:

• a positive electrode;
• a negative electrode;
• and
• a separator interposed between the positive electrode and the negative electrode,
• wherein a ratio (RW2/RW1) of a weight ratio (RW2) of a positive electrode mixture layer to a negative electrode mixture layer per a unit area (1 cm×1 cm) selected from a region (boundary region) including a boundary line of a coated part, to a weight ratio (RW1) of the positive electrode mixture layer to the negative electrode mixture layer per a unit area (1 cm×1 cm) selected from a region (central region) which does not include the boundary line of the coated part is in a range of 0.8 to 1 on a basis of a positive electrode and a negative electrode facing each other while interposing the separator therebetween.