Alpha-phase nickel hydroxide and preparation method and use thereof

A method for preparing an α-phase nickel hydroxide, comprising the following steps:

• subjecting a biomass calcium source to a calcination to obtain a porous calcium oxide;
• under a first protective atmosphere, mixing the porous calcium oxide with a first methanol-ethanol solvent to obtain a calcium oxide heterogeneous solution;
• under a second protective atmosphere, mixing the calcium oxide heterogeneous solution with a nickel source homogeneous solution to obtain a mixture, and subjecting the mixture to a coprecipitation to obtain a nickel calcium hydroxide precursor, wherein the nickel source homogeneous solution is prepared with a nickel source containing crystal water as a solute and a second methanol-ethanol solvent as a solvent;
• and
• subjecting the nickel calcium hydroxide precursor to a calcium hydroxide removal treatment to obtain the α-phase nickel hydroxide;
• wherein the calcium hydroxide is formed by hydration of the porous calcium oxide with crystal water in the nickel source;
• wherein the first methanol-ethanol solvent and the second methanol-ethanol solvent independently have a volume ratio of methanol to ethanol of 1:0.1 to 1:10;
• wherein the calcium hydroxide removal treatment comprises removing calcium hydroxide by using a dilute hydrochloric acid;
• and
• wherein a ratio of a mass of the nickel calcium hydroxide precursor to a number of moles of hydrochloric acid in the dilute hydrochloric acid is in a range of 1 g:(4-200) mmol.