Patent ID: 8574763

Claim:
An electrode plate including: a current collector plate; and an active material layer formed on the current collector plate, the active material layer containing at least an active material and a binder, wherein the binder includes a plurality of binders having glass transition points Tg different from each other, provided that the active material layer is split into two portions in a middle in a thickness direction and that a portion forming a surface of the active material layer is referred to as a surface section and another portion contacting the current collector plate as a current collector plate section, a ratio (A 2 /A 1 ) between an amount of the binder contained in the surface section (A 2 ) and an amount of the binder contained in the current collector plate section (A 1 ) is 1.0 to 1.2, and the binder contained in the surface section has an average glass transition point Tgu lower than an average glass transition point Tgd of the binder contained in the current collector plate section.