Method for forming electrode for battery
View Patent ↗A method for forming an electrode for a battery includes the step of forming a porous layer on the surface of an electrode hoop formed at its surface with a mixture layer containing an active material. The porous layer is formed in the following manner: A gravure roll is rotated oppositely to the direction of movement of the electrode hoop while being allowed to abut against the surface of the moving electrode hoop, thereby applying a coating fluid serving as a precursor of the porous layer to the surface of the electrode hoop. A plurality of grooves formed in the circumferential surface of the gravure roll extend in parallel in oblique directions against the rotation direction of the gravure roll from the central line of the circumferential surface to the outer edges of the circumferential surface so as to be arranged in a symmetrical manner relative to the central line.
1. A method for forming an electrode for a battery, said method comprising the steps of:
preparing an electrode hoop formed at its surface with a mixture layer containing an active material and
forming a porous layer on the surface of the electrode hoop,
the step of forming the porous layer comprising the steps of:
rotating a gravure roll oppositely to the direction of movement of the electrode hoop while allowing the gravure roll to abut against the surface of the moving electrode hoop, thereby applying a coating fluid serving as a precursor of the porous layer to the surface of the electrode hoop, the circumferential surface of the gravure roll being formed with a plurality of grooves, and
drying the coating fluid applied to the surface of the electrode hoop,
the grooves extending in parallel in oblique directions against the direction of rotation of the gravure roll from a generally central line of the circumferential surface to the outer edges of the circumferential surface so as to be arranged in a symmetrical manner relative to the generally central line.
2. A method for forming an electrode for a battery, said method comprising the steps of:
preparing an electrode hoop formed at its surface with a mixture layer containing an active material and
forming a porous layer on the surface of the electrode hoop,
the step of forming the porous layer comprising the steps of:
rotating a gravure roll oppositely to the direction of movement of the electrode hoop while allowing the gravure roll to abut against the surface of the moving electrode hoop, thereby applying a coating fluid serving as a precursor of the porous layer to the surface of the electrode hoop, the circumferential surface of the gravure roll being formed with a plurality of grooves, and
drying the coating fluid applied to the surface of the electrode hoop,
the grooves including
first grooves extending in parallel in an oblique direction against the direction of rotation of the gravure roll from the vicinity of one outer edge of the circumferential surface to the other outer edge, and
second grooves extending in parallel with the direction of rotation of the gravure roll, said second groove being adjacent to the vicinity of said one outer edge of the circumferential surface.
3. A method for forming an electrode for a battery, said method comprising the steps of:
preparing an electrode hoop formed at its surface with a mixture layer containing an active material and
forming a porous layer on the surface of the electrode hoop,
the step of forming the porous layer comprising the steps of:
rotating a gravure roll oppositely to the direction of movement of the electrode hoop while allowing the gravure roll to abut against the surface of the moving electrode hoop, thereby applying a coating fluid serving as a precursor of the porous layer to the surface of the electrode hoop, the circumferential surface of the gravure roll being formed with a plurality of grooves, and
drying the coating fluid applied to the surface of the electrode hoop,
the grooves extending in parallel in an oblique direction against the direction of rotation of the gravure roll from one outer edge of the circumferential surface to the other outer edge, the angle of inclination of each said groove relative to the direction of rotation of the gravure roll falling within the range of 0.05° through 20°.