High-voltage ternary positive electrode material for lithium-ion battery and preparation method thereof
First Claim
1. A method for preparing a high-voltage ternary positive electrode material of a lithium-ion battery, wherein a molecular formula of the positive electrode material of the lithium-ion battery is LiNi0.6-xMgxCo0.2-yAlyMn0.2-zTizO2-dFd, wherein 0<
- x≤
0.05, 0<
y≤
0.05, 0<
z≤
0.05, and 0<
d≤
0.05;
wherein the method comprises the following steps;
step 1;
weighing a sample including a nickel source material, a magnesium source material, a cobalt source material, an aluminum source material, a manganese source material and, a titanium source material at a molar ratio of Ni;
Mg;
Co;
Al;
Mn;
Ti=(0.6−
x);
x;
(0.2−
y);
y;
(0.2−
z);
z;
dividing the sample into two parts at molar ratios of (Ni+Mg);
(Co+Al);
(Mn+Ti)=5;
2;
3 and 7;
2;
1 respectively, and dissolving the two parts respectively in deionized water to obtain a solution a and a solution b;
step 2, mixing a sodium hydroxide solution with ammonia to form a solution c, wherein the solution c is composed of the sodium hydroxide at a concentration of 2.0 mol/L and the ammonia at a concentration of 0.5 mol/L;
step 3, uniformly dropping the solution a and the solution c into a beaker containing deionized water, and then uniformly dropping the solution b and the solution c into the beaker and placing the beaker in a water bath at a temperature of 50 to 80°
C. and stirring continuously;
step 4, adding the ammonia into a mixed solution obtained from the step 3, adjusting pH to be 11, and stirring continuously for 5 hours, then raising the temperature to 70°
C. and aging for 12 hours;
step 5, filtering and washing a product obtained from the step 4 until no sulfate ion is detected using BaCl2 solution, and then drying the product in a blast oven and grinding the product evenly;
step 6, mixing a precursor obtained from the step 5 with a lithium source and a fluorine source, grinding a mixture evenly and drying the mixture using absolute ethanol as a dispersant; and
step 7, grinding the mixture obtained from the step 6 evenly, and putting the mixture in a tube furnace, raising a temperature to 450-550°
C. at 5°
C./min in an oxygen air atmosphere, and pre-sintering the mixture for 5-10 hours;
then raising the temperature to 700-850°
C. at 2°
C./min, and sintering the mixture for 10-24 hours;
grinding the product after natural cooling in the oxygen atmosphere, and obtaining the positive electrode material LiNi0.6-xMgxCo0.2-yAlyMn0.2-zTizO2-dFd the lithium-ion battery, wherein the positive electrode material has a layered structure, and nickel has gradient distribution in particles.
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Abstract
The present invention discloses a high-voltage ternary positive electrode material for lithium-ion battery and preparation method thereof. The chemical formula of the material is LiNi0.6-xMgxCo0.2-yAlyMn0.2-zTizO2-dFd, wherein 0<x,y,z,d≤0.05. The precursor of the positive electrode material is synthesized by gradient co-precipitation method and the positive electrode material is prepared by solid phase method. The content of nickel in the synthesized precursor particles has a gradient distribution from the inside to the outside. The obtained precursor is mixed and grinded evenly with the lithium source and the fluorine source at a certain ratio and put into the tube furnace. The obtained precursor is then pre-sintered in the oxygen-enriched air atmosphere and then heated up to be sintered, to obtain the target product. The positive electrode material for lithium-ion battery prepared by the method is free from impurity phase and has a good crystallinity, which is a high energy density positive electrode material.
-
Citations
9 Claims
-
1. A method for preparing a high-voltage ternary positive electrode material of a lithium-ion battery, wherein a molecular formula of the positive electrode material of the lithium-ion battery is LiNi0.6-xMgxCo0.2-yAlyMn0.2-zTizO2-dFd, wherein 0<
- x≤
0.05, 0<
y≤
0.05, 0<
z≤
0.05, and 0<
d≤
0.05;wherein the method comprises the following steps; step 1;
weighing a sample including a nickel source material, a magnesium source material, a cobalt source material, an aluminum source material, a manganese source material and, a titanium source material at a molar ratio of Ni;
Mg;
Co;
Al;
Mn;
Ti=(0.6−
x);
x;
(0.2−
y);
y;
(0.2−
z);
z;
dividing the sample into two parts at molar ratios of (Ni+Mg);
(Co+Al);
(Mn+Ti)=5;
2;
3 and 7;
2;
1 respectively, and dissolving the two parts respectively in deionized water to obtain a solution a and a solution b;step 2, mixing a sodium hydroxide solution with ammonia to form a solution c, wherein the solution c is composed of the sodium hydroxide at a concentration of 2.0 mol/L and the ammonia at a concentration of 0.5 mol/L; step 3, uniformly dropping the solution a and the solution c into a beaker containing deionized water, and then uniformly dropping the solution b and the solution c into the beaker and placing the beaker in a water bath at a temperature of 50 to 80°
C. and stirring continuously;step 4, adding the ammonia into a mixed solution obtained from the step 3, adjusting pH to be 11, and stirring continuously for 5 hours, then raising the temperature to 70°
C. and aging for 12 hours;step 5, filtering and washing a product obtained from the step 4 until no sulfate ion is detected using BaCl2 solution, and then drying the product in a blast oven and grinding the product evenly; step 6, mixing a precursor obtained from the step 5 with a lithium source and a fluorine source, grinding a mixture evenly and drying the mixture using absolute ethanol as a dispersant; and step 7, grinding the mixture obtained from the step 6 evenly, and putting the mixture in a tube furnace, raising a temperature to 450-550°
C. at 5°
C./min in an oxygen air atmosphere, and pre-sintering the mixture for 5-10 hours;
then raising the temperature to 700-850°
C. at 2°
C./min, and sintering the mixture for 10-24 hours;grinding the product after natural cooling in the oxygen atmosphere, and obtaining the positive electrode material LiNi0.6-xMgxCo0.2-yAlyMn0.2-zTizO2-dFd the lithium-ion battery, wherein the positive electrode material has a layered structure, and nickel has gradient distribution in particles. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
- x≤
Specification