Precursor for preparation of lithium composite transition metal oxide, method for preparing the same and lithium composite transition metal oxide obtained from the same
View Patent ↗Disclosed are a precursor for preparation of a lithium composite transition metal oxide, a method for preparing the same and a lithium composite transition metal oxide obtained from the same. More particularly, the transition metal precursor which has a composition represented by Formula 1 below and is prepared in an aqueous transition metal solution, mixed with a transition metal-containing salt, including an alkaline material, the method for preparing the same and the lithium composite transition metal oxide obtained from the same are disclosed. Mn a M b (OH 1-x ) 2-y A y (1) wherein M is at least one selected form the group consisting of Ni, Ti, Co, Al, Cu, Fe, Mg, B, Cr, Zr, Zn and Period II transition metals; A is at least one selected form the group consisting of anions of PO 4 , BO 3 , CO 3 , F and NO 3 , and 0.5≤a≤1.0; 0≤b≤0.5; a+b=1; 0<x<1.0; and 0≤y≤0.02.
1. A method of preparing a transition metal precursor comprising:
preparing an aqueous transition metal solution comprising a transition metal-containing salt for preparing a precursor having a first anion;
mixing a second anion selected from the group consisting of PO 4 , BO 3 , CO 3 , F and NO 3 and a reducing agent with the aqueous transition metal solution to substitute anion sites of the precursor; and
co-precipitating by adding a strong base after the mixing to form the transition metal precursor having a composition represented by Formula 1 below:
Mn a M b (OH 1-x ) 2-y A y (1)
wherein M is Ni and Co;
A is at least one selected from the group consisting of anions of PO 4 , BO 3 , CO 3 , F and NO 3 ;
0.5≤a≤1.0; 0≤b≤0.5; a+b=1; 0<x<1.0; and 0<y≤0.02;
wherein the reducing agent is a sugar-based material; and
wherein the transition metal-containing salt consists of a transition metal cation and the first anion.
2. The method according to claim 1 , wherein the reducing agent has a concentration of 2.0 to 7.0 mol % based on a molar amount of the aqueous transition metal solution.