KR-20260064080-A - MANUFATURING METHOD FOR POSITIVE ACTIVE MATERIAL AND POSITIVE ACTIVE MATERIAL

Abstract

The present disclosure relates to a method for manufacturing an anode active material comprising: obtaining a transition metal hydroxide comprising nickel, cobalt, and manganese; heating a first mixture in an oxygen atmosphere and at a first temperature to obtain a preliminary lithium transition metal oxide; and heating a second mixture in an oxygen atmosphere and at a second temperature to obtain a lithium transition metal oxide; wherein the first mixture comprises the transition metal hydroxide and the lithium compound, and the second mixture comprises the preliminary lithium transition metal oxide and a boron precursor, the second temperature is within the range of 730 °C to 780 °C, and the boron precursor content of the second mixture is within the range of 0.7 mol% to 1.3 mol% based on the transition metal excluding lithium in the preliminary lithium transition metal oxide.

Inventors

• 김진규
• 신세희
• 최진혁
• 이슬기
• 김선화

Assignees

• 주식회사 에코프로비엠

Dates

Publication Date

20260507

Application Date

20241031

Claims (17)

1. Obtaining transition metal hydroxides containing nickel, cobalt, and manganese; A first mixture is heated in an oxygen atmosphere and at a first temperature to obtain a preliminary lithium transition metal oxide; and A second mixture is heated in an oxygen atmosphere and at a second temperature to obtain a lithium transition metal oxide; comprising, The first mixture above includes the transition metal hydroxide and lithium compound, and The second mixture comprises the preliminary lithium transition metal oxide and boron precursor, and The second temperature mentioned above is within the range of 730 ℃ to 780 ℃, and A method for manufacturing an anode active material in which the boron precursor content of the second mixture is within the range of 0.7 mol% to 1.3 mol% based on the transition metal excluding lithium in the preliminary lithium transition metal oxide.
2. In paragraph 1, The above second mixture is a method for manufacturing an anode active material that further includes a cobalt precursor.
3. In paragraph 1, A method for manufacturing an anode active material in which the nickel content of the above transition metal hydroxide is 60 mol% or more.
4. In paragraph 1, The above first mixture further comprises a doping element precursor, and A method for manufacturing a positive electrode active material comprising two or more doping elements selected from the group consisting of Al, Zr, Ba, Ce, Hf, Ta, Cr, F, Mg, Cr, V, Ti, Fe, Zn, Si, Y, Nb, Ga, Sn, Mo, W, P, Sr, Ge, Nd, Gd, and Cu.
5. In paragraph 1, The above doping elements are a method for manufacturing a positive electrode active material containing Al and Zr.
6. In paragraph 5, A method for manufacturing an anode active material in which the aluminum precursor content of the first mixture is within the range of 0.4 mol% to 0.6 mol% based on the transition metal excluding lithium among the transition metal hydroxides.
7. In paragraph 5, A method for manufacturing an anode active material in which the zirconium precursor content of the first mixture is within the range of 0.1 mol% to 0.3 mol% based on the transition metal excluding lithium among the transition metal hydroxides.
8. In paragraph 2, A method for manufacturing an anode active material in which the cobalt precursor content of the second mixture is within the range of 0.7 mol% to 1.3 mol% based on the transition metal excluding lithium in the preliminary lithium transition metal oxide.
9. In paragraph 1, A method for manufacturing a positive electrode active material in which the first temperature is within the range of 700 ℃ to 770 ℃.
10. In paragraph 1, A method for manufacturing a positive electrode active material in which the second temperature is within the range of 700 ℃ to 770 ℃.
11. A lithium transition metal oxide comprising nickel, cobalt, manganese, and doping elements; and A coating layer disposed on the surface of the above lithium transition metal oxide and comprising lithium boron oxide; It is a positive active material containing, The above doping element includes boron, and A positive electrode active material having a lithium boron oxide content within the range of 0.3 weight% to 1.6 weight%.
12. In Paragraph 11, A positive electrode active material having a nickel content of 60 mol% or more of the lithium transition metal oxide.
13. In Paragraph 11, The above doping element comprises two or more types selected from the group consisting of Al, Zr, Co, Ba, Ce, Hf, Ta, Cr, F, Mg, Cr, V, Ti, Fe, Zn, Si, Y, Nb, Ga, Sn, Mo, W, P, Sr, Ge, Nd, Gd, and Cu, forming a positive electrode active material.
14. In Paragraph 13, The above doping element comprises one or more selected from the group consisting of Al, Zr, and Co., forming a positive electrode active material.
15. In Paragraph 14, A positive active material having an Al content within the range of 0.4 mol% to 0.6 mol%.
16. In paragraph 15, A positive active material having a Zr content within the range of 0.1 mol% to 0.3 mol%.
17. In Paragraph 11, The above positive electrode active material comprises primary particles containing the lithium transition metal oxide and secondary particles formed by the aggregation of the primary particles, and A positive active material having a primary particle size of 150 nm or less.

Description

Manufacturing Method for Positive Active Material and Positive Active Material The present disclosure relates to a method for manufacturing a positive electrode active material and a positive electrode active material. Lithium secondary batteries can repeatedly charge and discharge through the intercalation and deintercalation of lithium ions. Lithium secondary batteries supply power to external devices through these repeated charging and discharging cycles. Lithium composite oxides can be used for the intercalation/deintercalation of lithium ions. Lithium composite oxides form a structure in which lithium ions and transition metals are combined, storing lithium ions internally and releasing them externally. Nickel, cobalt, and manganese may be included as transition metals in lithium composite oxides. The characteristics of lithium composite oxides can affect the lifespan characteristics and performance of lithium secondary batteries. Figure 1 shows the XRD analysis results of the lithium transition metal oxide of the present disclosure. Figure 2 is an enlarged view of a part of Figure 1. Figure 3 shows the CP-SEM cross-sectional imaging results of Example 1. Figure 4 shows the CP-SEM cross-sectional imaging results of Comparative Example 1. Figure 5 shows the CP-SEM cross-sectional imaging results of Comparative Example 2. Figure 6 shows the CP-SEM cross-sectional imaging results of Comparative Example 3. Figure 7 shows the CP-SEM cross-sectional imaging results of Comparative Example 4. Figures 8 and 9 illustrate the results of the electrochemical characteristic evaluation. FIG. 10 is an enlarged view of the mAh/g range with a capacity of 200 mAh/g to 220 mAh/g in FIG. 9. Figure 11 shows the discharge capacity results of a secondary battery according to 40 cycles. The present disclosure is described in detail below. One embodiment of the present disclosure relates to a method for manufacturing a positive electrode active material. The method for manufacturing an anode active material of the present disclosure comprises: obtaining a transition metal hydroxide comprising nickel, cobalt, and manganese; heating a first mixture comprising said transition metal hydroxide and a lithium compound in an oxygen atmosphere and at a first temperature to obtain a preliminary lithium transition metal oxide; and heating a second mixture comprising said preliminary lithium transition metal oxide and a boron precursor in an oxygen atmosphere and at a second temperature to obtain a lithium transition metal oxide; wherein the boron precursor content of the second mixture may be in the range of 0.7 mol% to 1.3 mol%. The method for manufacturing an anode active material of the present disclosure comprises obtaining a transition metal hydroxide comprising nickel, cobalt, and manganese; heating a first mixture in an oxygen atmosphere and at a first temperature to obtain a preliminary lithium transition metal oxide; and heating a second mixture in an oxygen atmosphere and at a second temperature to obtain a lithium transition metal oxide. The first mixture comprises the transition metal hydroxide and the lithium compound. The second mixture comprises the preliminary lithium transition metal oxide and the boron precursor. The second temperature is within the range of 730°C to 780°C. The boron precursor content of the second mixture is within the range of 0.7 mol% to 1.3 mol% based on the transition metal excluding lithium in the preliminary lithium transition metal oxide. First, the present disclosure may perform obtaining a transition metal hydroxide comprising nickel, cobalt, and manganese. The transition metal hydroxide may be used as a precursor for the lithium transition metal oxide described below. A preliminary lithium transition metal oxide may be obtained by heating the transition metal hydroxide and a lithium compound together. The lithium compound is used as a lithium raw material. The lithium transition metal oxide may be obtained by heating the preliminary lithium transition metal oxide together with a boron precursor. The above transition metal hydroxide can be obtained by using a precursor comprising at least one of the above transition metals. Specifically, the above transition metal hydroxide can be prepared by applying a coprecipitation method using a precursor comprising at least one of the above transition metals. Methods for preparing transition metal hydroxides by coprecipitation are known, and these may be applied without limitation in the present disclosure. In another example, obtaining the above transition metal hydroxide may mean obtaining a commercially available transition metal hydroxide. The present disclosure may perform heating a first mixture in an oxygen atmosphere and at a first temperature to obtain a preliminary lithium transition metal oxide. The first mixture may include the transition metal hydroxide and the lithium compound. The above lithium compound may be a lithium raw material that re