A slot die (1, 6, 7, 8) for manufacturing a rechargeable battery electrode, comprising: a first block; a second block facing the first block; and a shim member (30, 230, 330, 430, 530, 630, 730, 830) positioned between the first block and the second block, the shim member having end portions (31, 32, 35, 36, 37, 38, 44, 45, 46) spaced apart from one another to form a slot (40, 240, 340, 440, 540, 640, 740, 840) between the end portions and the facing surfaces of the first block and the second block for discharging an active material slurry at a discharge side of the slot, the first block includes a chamber for receiving the active material slurry, the slot die being characterized in that each of the end portions includes a width adjuster, A1, protruding to a second reference point, P2, from a first reference point, P1, of the shim member in the width direction by a first adjusting width (Lw), inclined to a third reference point, P3, from the second reference point with a first angle (θ 1) with respect to the discharging direction, and formed in the discharging direction by a first adjusting length (Ls), wherein the first and second reference points are on a first line parallel to the width direction and the first reference point and the third reference point are on a second line parallel to the discharging direction, wherein the first line is on sides of the end portions, the sides being the farthest from the discharge side of the slot, wherein a distance between the respective second reference points of the end portions is a width of the slot along the first line, and wherein the first angle is such that the slot gradually widens in the discharging direction from the second reference points to the third reference points. a first block; a second block facing the first block; and a shim member (30, 230, 330, 430, 530, 630, 730, 830) positioned between the first block and the second block, the shim member having end portions (31, 32, 35, 36, 37, 38, 44, 45, 46) spaced apart from one another to form a slot (40, 240, 340, 440, 540, 640, 740, 840) between the end portions and the facing surfaces of the first block and the second block for discharging an active material slurry at a discharge side of the slot, the first block includes a chamber for receiving the active material slurry, the slot die being characterized in that each of the end portions includes a width adjuster, A1, protruding to a second reference point, P2, from a first reference point, P1, of the shim member in the width direction by a first adjusting width (Lw), inclined to a third reference point, P3, from the second reference point with a first angle (θ 1) with respect to the discharging direction, and formed in the discharging direction by a first adjusting length (Ls), wherein the first and second reference points are on a first line parallel to the width direction and the first reference point and the third reference point are on a second line parallel to the discharging direction, wherein the first line is on sides of the end portions, the sides being the farthest from the discharge side of the slot, wherein a distance between the respective second reference points of the end portions is a width of the slot along the first line, and wherein the first angle is such that the slot gradually widens in the discharging direction from the second reference points to the third reference points.