Producing method for positive electrode plate

A producing method for a positive electrode plate comprising a positive electrode mixture layer on a surface of a current collector, the producing method comprising:

• first-positive-electrode-paste preparing of preparing a first positive electrode paste including first carbon nanotubes, positive active material particles, and a solvent;
• second-positive electrode-paste preparing of preparing a second positive electrode paste including second carbon nanotubes, the positive active material particles, and the solvent;
• first coating of coating the first positive electrode paste on the surface of the current collector to form a first positive electrode paste layer on the surface of the current collector;
• second coating of coating the second positive electrode paste on any one of a surface of the first positive electrode paste layer or a surface of a first positive electrode mixture layer which is formed by drying the first positive electrode paste layer to form a second positive electrode paste layer;
• and
• any one of
• drying the first positive electrode paste layer ad the second positive electrode paste layer after the second coating to form the positive electrode mixture layer, or
• drying including steps of first drying of the first positive electrode paste before the second coating to form the first positive electrode mixture layer and second drying of the second positive electrode paste layer, which has been coated on the surface of the first positive electrode mixture layer, to form the positive electrode mixture layer, wherein
• a length of each of the first carbon nanotubes is within a range of 1.0 μm to 3.0 μm, and a length of each of the second carbon nanotubes is within a range of 0.3 μm to 0.8 μm, wherein
• the first positive electrode paste includes the first carbon nanotubes, without including the second carbon nanotubes, and
• the second positive electrode paste includes the second carbon nanotubes, without including the first carbon nanotubes.