▎ 摘　　要

NOVELTY - A porous negative electrode comprises an electrolyte containing a water-soluble salt, a metal layer containing zinc, and a fiber layer laminated on the metal layer and formed in a porous structure using carbon fibers to increase a surface area in contact with the electrolyte. The fiber layer is formed with a thickness of 1-10 mu m so that ions can move. USE - Porous negative electrode used in manganese dioxide-zinc battery (claimed) for e.g. mobile device. ADVANTAGE - The porous negative electrode prevents increase of internal resistance of cell due to zinc hydride sulfate, reduces overvoltage, and improves service life of battery. DETAILED DESCRIPTION - An INDEPENDENT CLAIM is included for manufacture of manganese dioxide-zinc battery, which comprises the porous negative electrode, an anode comprising manganese dioxide, a separator, and electrolytes containing water-soluble salts.