Nickel oxyhydroxide doped with cobalt and aluminum and preparation method thereof

Abstract

The invention discloses cobalt and aluminum doped nickel oxyhydroxide of which the molecular formula is Ni[1-a-b-c]XaCobAlcOOH, wherein the mole numbers of a, b and c are all greater than 3% and less than 10%; and 0.03<=a<=0.01, 0.03<=b<=0.10, and 0.03<=c<=0.10. The preparation method comprises the following steps of: (1) co-depositing cobalt and aluminum doped nickel hydroxide; (2) coating with a rare earth compound; (3) coating with a second layer of metal cobalt compound; and (4) oxidizing nickel cobalt aluminum hydroxide coated with rare earth and a cobalt compound, filtering, washing and drying to obtain the product disclosed by the invention. The cobalt and aluminum doped nickel oxyhydroxide produced by the invention has high specific capacity, high sphericity, large tap density and stable performance.

Description

technical field [0001] The invention relates to battery materials for alkaline batteries and secondary batteries, in particular to nickel oxyhydroxide doped with cobalt and aluminum and a preparation method thereof. Background technique [0002] In recent years, with the rise of digital electronic products (such as MP3, digital cameras and handheld computers, etc.), people have put forward higher and higher requirements on the performance of existing batteries, especially the high-current heavy-load discharge capacity. Although the current general-purpose alkaline zinc-manganese battery is also making progress in performance, but because its main discharge performance depends on its positive electrode manganese dioxide, resulting in low discharge voltage and poor charge and discharge performance, it is increasingly unable to meet the needs of digital cameras. The needs of electronic products such as electric toys and electric toys have forced people to study a new type of el...

AI Technical Summary

Problems solved by technology

Although the current general-purpose alkaline zinc-manganese battery is also making progress in performance, but because its main discharge performance depends on its positive electrode manganese dioxide, resulting in low discharge voltage and poor charge and discharge performance, it is increasingly unable to meet the needs of digital cameras. The needs of electronic products such as electronic toys and electric toys force people to study a new type of electrode material to improve the discharge performance of the manganese dioxide positive electrode

[0003] At present, the nickel oxyhydroxide produced by most manufacturers has a low specific capacity, which cannot meet the load discharge of high current, and the use environment is limited.

The phenomenon of product performance degradation after long-term storage