Lithium compound, nickel-based cathode active material, method for preparing lithium oxide, method for preparing nickel-based cathode active material, and secondary battery using same
AssigneesPosco, Research Institute of Industrial Science & Technology
InventorsJae Myung Lee, Jun-Kyu Ahn, Sang Won Kim, Heok Yang
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Abstract
The present invention relates to a lithium compound, a nickel-based cathode active material, a method for preparing lithium oxide, a method for preparing a nickel-based cathode active material, and a secondary battery using same. The lithium compound includes primary particles of Li2O having an average particle diameter (D50) of less than or equal to 5 μm; and secondary particles composed of the primary particles.
Claims13
A lithium compound, comprising
- Li2O primary particles having an average particle diameter (D50) of less than or equal to 5 μm;
- and
- secondary particles composed of the primary particles.
A nickel-based cathode active material derived from a lithium compound including primary Li2O particles having an average particle diameter (D50) of less than or equal to 5 μm and secondary particles composed of the primary particles;
- and a nickel raw material.
A method for preparing lithium oxide, comprising
- reacting hydrogen peroxide (H2O2) and lithium hydroxide (LiOH) to obtain over-lithiated oxide (Li2O2);
- and
- heat-treating the over-lithiated oxide to obtain lithium oxide (Li2O),
- wherein in the reacting of the hydrogen peroxide (H2O2) and lithium hydroxide (LiOH) to obtain a over-lithiated oxide (Li2O2),
- a mole ratio (Li/H2O2) of lithium of lithium hydroxide to hydrogen peroxide is 1.9 to 2.4.
A method for preparing a nickel-based cathode active material, comprising
- reacting hydrogen peroxide (H2O2) and lithium hydroxide (LiOH) to obtain over-lithiated oxide (Li2O2);
- heat-treating the over-lithiated oxide to obtain lithium oxide (Li2O);
- and
- firing the lithium oxide and nickel raw material to obtain a nickel-based cathode active material;
- wherein in the reacting of the hydrogen peroxide (H2O2) and lithium hydroxide (LiOH) to obtain a over-lithiated oxide (Li2O2),
- a mole ratio (Li/H2O2) of lithium of lithium hydroxide to hydrogen peroxide is 1.9 to 2.4.
(canceled)
Dependencies are inferred from the claim text.