Irreversible additive, positive electrode material including irreversible additive, and lithium secondary battery including positive electrode material

Patent metadata

Field	Value
Publication number	US-12456724-B2
Application number	US-202017774070-A
Country	US
Kind code	B2
Filing date	Nov 11, 2020
Priority date	Nov 11, 2019
Publication date	Oct 28, 2025
Grant date	Oct 28, 2025

Abstract

An irreversible additive includes an oxide having a trigonal crystal structure and represented by Formula 1, and a coating layer positioned on a surface of the oxide and including a compound represented by Formula 2. A positive electrode material including the irreversible additive and a lithium secondary battery including the positive electrode material including the irreversible additive are also provided.

First claim

The invention claimed is:

1. An additive comprising:
a lithium nickel oxide having a trigonal crystal structure and represented by Formula 1 below; and
a coating layer positioned on a surface of the lithium nickel oxide represented by Formula 1 and including a compound represented by Formula 2 below:
Li 2+a Ni 1−b M1 b O 2+c ,  [Formula 1]

wherein in Formula 1 above,
0≤a≤0.2, 0≤b≤0.5, and 0≤c≤0.2, and M1 is one or more selected from the group consisting of Cu, Mg, Pt, Al, Co, P, and B,
Li 5+c FeO 4−d A d ,  [Formula 2]

wherein in Formula 2 above,
0≤c≤0.2 and 0≤d≤0.5, and A is one or more selected from the group consisting of F, Cl, Br, I, At, and S.

2. The additive of claim 1 , wherein a space group of the lithium nickel oxide represented by Formula 1 above belongs to P3-m1.

3. The additive of claim 1 , wherein the lithium nickel oxide represented by Formula 1 above comprises lithium and nickel in a molar ratio of 1.5 to 2:1.

4. The additive of claim 1 , wherein the lithium nickel oxide represented by Formula 1 above is Li 2 NiO 2 .

5. The additive of claim 1 , wherein the compound represented by Formula 2 has an orthorhombic crystal structure.

6. The additive of claim 1 , wherein the compound represented by Formula 2 above is Li 5 FeO 4 .

7. The additive of claim 1 , wherein the compound represented by Formula 2 above is included in an amount from 1 to 10 parts by weight based on 100 parts by weight of the lithium nickel oxide represented by Formula 1 above.

8. A positive electrode material comprising the additive according to claim 1 and a positive electrode active material.

9. The positive electrode material of claim 8 , wherein the positive electrode active material is represented by [Formula 3] below:
Li 1+f Ni x Co y M3 z M4 w O 2 ,  [Formula 3]

wherein in Formula 3 above, 0≤f≤0.2, 0<x<1, 0<y<1, 0<z<1, and 0≤w≤0.1, M3 is one or more of Mn or Al, and M4 is one or more selected from the group consisting of Al, Mg, Ti, W, Zr, V, Fe, Y, and Mo.

10. The positive electrode material of claim 8 , wherein the positive electrode active material is represented by [Formula 4] below:
Li 1+f1 Ni x1 Co y1 Mn z1 Al z2 M4 w1 O 2 ,  [Formula 4]

wherein in Formula 4 above, 0≤f1≤0.2, 0.8≤x1<1, 0<y1<0.2, 0<z1<0.2, 0<z2<0.2, and 0≤w1≤0.1, and M4 is one or more selected from the group consisting of Mg, Ti, W, Zr, V, Fe, Y, and Mo.

11. The positive electrode material of claim 8 , wherein the additive is included in an amount from 5 to 20 parts by weight based on 100 parts by weight of the positive electrode active material.

12. A lithium secondary battery comprising:
a positive electrode including the positive electrode material of claim 8 ;
a negative electrode positioned to face the positive electrode; and
an electrolyte.

13. The lithium secondary battery of claim 12 , wherein the negative electrode comprises a silicon-based negative electrode active material.

14. The lithium secondary battery of claim 12 , further comprising a separator interposed between the positive electrode and the negative electrode.

15. The additive of claim 1 , wherein the additive has an oxygen formation energy value that is above 4.7 eV.

Assignees

• Lg Energy Solution Ltd

Inventors

• Lim Sung Chul
• Jang Min Chul
• Uhm In Sung

Classifications

• H01M2004/028

  Positive electrodes · CPC title

• H01M2004/027

  Negative electrodes · CPC title

• H01M10/0525

  Rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodes; Lithium-ion batteries · CPC title

• H01M4/582

  Halogenides · CPC title

• H01M4/525

  of mixed oxides or hydroxides containing iron, cobalt or nickel for inserting or intercalating light metals, e.g. LiNiO2, LiCoO2 or LiCoOxFy · CPC title