Green and clean preparation method of sea urchin-shaped nano nickel oxalate electrode material

The invention discloses a green and clean preparation method of a sea urchin-shaped nano nickel oxalate electrode material, which comprises the following steps of: firstly, adding soluble nickel salt and ascorbic acid into deionized water, and stirring until the soluble nickel salt and the ascorbic acid are completely dissolved to obtain a nickel salt solution; the preparation method comprises the following steps: adding an oxalic acid solid into ethylene glycol, stirring until the oxalic acid solid is completely dissolved, then adding an oxalic acid solution into a nickel salt solution, controlling parameters of a reaction process, filtering and washing after the reaction is completed, and drying in vacuum to obtain the sea urchin-shaped crystal water-containing nickel oxalate electrode material. Under the inert atmosphere condition, the obtained sea urchin-shaped crystal water-containing nickel oxalate electrode material is placed in a vacuum tube furnace, the sintering temperature and the sintering time ar