IP Library › Granted Patent US 12,322,791
Granted Patent B2
US 12,322,791 · App. 18/603,865 · Granted Jun 3, 2025

Positive active material for rechargeable lithium battery, preparing method thereof and rechargeable lithium battery including the same

Inventors: Jungsue Jang (Yongin-si, KR); Donghyun Kil (Yongin-si, KR); Minhan Kim (Yongin-si, KR); Jinyoung Kim (Yongin-si, KR); Jinhwa Kim (Yongin-si, KR); Jihyun Seog (Yongin-si, KR); Jaeha Shim (Yongin-si, KR); Kiyong Ahn (Yongin-si, KR); Donggyu Chang (Yongin-si, KR); Youngjoo Chae (Yongin-si, KR); Aram Choi (Yongin-si, KR); Jeuk Ha (Yongin-si, KR)
Assignee: Samsung SDI Co., Ltd.
H01M4/364C01G53/40C01G53/44H01M4/0471H01M4/366H01M4/505H01M4/525H01M2004/021H01M2004/028
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Quick Facts
Patent No.
US 12,322,791
App. No.
18/603,865
Granted
Jun 3, 2025
Kind
B2
Abstract

Disclosed are a positive active material for a rechargeable lithium battery, a method of preparing the same, and a rechargeable lithium battery including the same. The positive active material includes a first positive active material in a form of secondary particles including a plurality of primary particles that are aggregated together, and a second positive active material having a single particle form, wherein both of the first positive active material and the second positive active material are nickel-based positive active materials, each of the first positive active material and the second positive active material is coated with cobalt, and a maximum roughness of a surface of the second positive active material is greater than or equal to about 15 nm.

Claims (24)

1. A positive active material for a rechargeable lithium battery, comprising:

a first positive active material in a form of secondary particles comprising a plurality of primary particles that are aggregated together, and

a second positive active material having a single particle form,

wherein both of the first positive active material and the second positive active material are nickel-based positive active materials,

each of the first positive active material and the second positive active material is coated with cobalt, and

the second positive active material has protrusions and depressions on the surface of the single particle, and

wherein:

a maximum roughness (R max ; peak to peak height) of a surface of the second positive active material is greater than or equal to about 15 nm.

2. The positive active material of claim 1 , wherein cobalt-containing compound is linearly or atypically attached to the surface of the single particle of the second positive active material.

3. The positive active material of claim 1 , wherein:

an average roughness (R a ) of the surface of the second positive active material is greater than or equal to about 1.5 nm, and/or

a root mean square roughness (R q ) of the surface of the second positive active material is greater than or equal to about 2.0 nm.

4. The positive active material of claim 1 , wherein a BET specific surface area of the positive active material including the first positive active material and the second positive active material is about 0.3 m 2 /g to about 0.6 m 2 /g.

5. The positive active material of claim 1 , wherein:

an average particle diameter of the first positive active material is about 7 μm to about 25 μm, and

an average particle diameter of the second positive active material is about 1 μm to about 10 μm.

6. The positive active material of claim 1 , wherein the first positive active material is included in an amount of about 50 wt % to about 90 wt %, and the second positive active material is included in an amount of about 10 wt % to about 50 wt % based on the total amount of the first positive active material and the second positive active material.

7. The positive active material of claim 1 , wherein:

the first positive active material comprises a compound represented by Chemical Formula 1, and

the second positive active material comprises a compound represented by Chemical Formula 11:

wherein, in Chemical Formula 1, 0.9≤a1≤1.8, 0.3≤x1≤1, 0≤y1≤0.7, and M 1 and M 2 are each independently selected from Al, B, Ba, Ca, Ce, Co, Cr, Cu, F, Fe, Mg, Mn, Mo, Nb, P, S, Si, Sr, Ti, V, W, Zr, and a combination thereof,

wherein, in Chemical Formula 11, 0.9≤a11≤1.8, 0.3≤x11≤1, 0≤y11≤0.7, and M 11 and M 12 are each independently selected from Al, B, Ba, Ca, Ce, Co, Cr, Cu, F, Fe, Mg, Mn, Mo, Nb, P, S, Si, Sr, Ti, V, W, Zr, and a combination thereof.

8. A rechargeable lithium battery comprising:

a positive electrode including the positive active material of claim 1 , a negative electrode, and an electrolyte.

Assignments (1)
ASSIGNMENT OF ASSIGNOR'S INTEREST Recorded Mar 13, 2024
From: JANG, JUNGSUE; KIL, DONGHYUN; KIM, MINHAN; KIM, JINYOUNG; KIM, JINHWA; SEOG, JIHYUN; SHIM, JAEHA; AHN, KIYONG; CHANG, DONGGYU; CHAE, YOUNGJOO; CHOI, ARAM; HA, JEUK
To: SAMSUNG SDI CO., LTD.
Reel/Frame 066756/0657 →
Priority Claims (1)
KR 10-2021-0069175 · May 28, 2021 · national
Continuity (2)
Continuation 17657316 · Mar 30, 2022
Related Publication 20240222602A1 · Jul 4, 2024
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