Method for the precipitation of particles of a metal carbonate material without use of a chelating agent
AssigneeHaldor TopsøE A/S
InventorsLine Holten Kollin, Rainer Küngas, Steen Henrik Olsen, Anni Stahl, Søren Dahl
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Abstract
In a method for the precipitation of particles of a metal carbonate material comprising nickel and manganese in an atomic ratio of 0≤Ni:Mn≤1:3, aqueous solutions comprising sulfates or nitrates of nickel and manganese are mixed with aqueous solutions of carbonates or mixtures of carbonates and hydroxides of sodium or potassium in a stirred reactor at pH>7.5 without the use of a chelating agent. Thereby agglomerated particles are formed without any subsequent process steps, in particular no subsequent process at temperatures higher than the precipitation temperature.
Claims13
A method for the precipitation of particles of a metal carbonate material comprising nickel and manganese in an atomic ratio of 0≤Ni:Mn≤1:3, wherein an aqueous solution comprising sulfates of nickel and manganese or an aqueous solution comprising nitrates of nickel and manganese is mixed with an aqueous solution of sodium carbonate or potassium carbonate or a mixture of sodium carbonate and sodium hydroxide or a mixture of potassium carbonate and potassium hydroxide in a stirred reactor at pH>7.5 without the use of a chelating agent, thereby forming agglomerated particles in one precipitation step without any subsequent process steps to change the shapes of the agglomerated particles before use of the agglomerated particles as a precursor for the preparation of a lithium-ion battery positive electrode material, wherein the agglomerated particles are characterized by an average circularity higher than 0.90 and simultaneously an average aspect ratio lower than 1.50.
Dependencies are inferred from the claim text.