The invention discloses a perforated positive plate of a
lithium ion battery. The perforated positive plate comprises a
current collector coated with a
lithium-
iron oxide layer, and active substance
layers arranged on upper and lower surfaces of the
current collector, wherein uniform
diffusion through holes are formed on the active substance
layers and the
current collector. The preparation methodcomprises the following steps: firstly
coating a layer of Li5FeO4 on the
aluminum foil surface to provide redundant
lithium source for the battery, thereby retarding the lithium
ion with the negativepole first effect to form irreversible SEI film consumption and enhancing long circulation performance; secondly, increasing the
energy density of the battery by using the positive
electrode with high compaction and
high surface density; and finally forming a perforated pole plate, wherein the
electrolyte can sufficiently enter the internal of the active substance to increase the infiltration ofthe
electrolyte and retarding the expansion of the active substance, and the perforated positive plate can be applied in the battery industrialization in large scale. The conventional perforated
aluminum foil is obtained by
coating after perforating, and the perforated positive plate is obtained by perforating after
coating, so that the surface density of the active substance is higher, and the
energy density of the battery is 30% higher in relative to the conventional perforated pole plate.