1. A preparation method of porous nickel-cobalt-manganese composite hydroxide is characterized by comprising the following steps: mixing a nickel salt, a cobalt salt, a manganese salt aqueous solution, a complexing agent and a precipitating agent, adding a loosening agent, adjusting the pH of the system to 10-12, and heating, stirring and reacting to obtain a porous nickel-cobalt-manganese composite hydroxide precipitate; and washing and drying to obtain the porous nickel-cobalt-manganese composite hydroxide.
aqueous solution
pH
10-12