Positive electrode active material and battery including the same

Patent metadata

Field	Value
Publication number	US-11955630-B2
Application number	US-202117165953-A
Country	US
Kind code	B2
Filing date	Feb 3, 2021
Priority date	Sep 5, 2018
Publication date	Apr 9, 2024
Grant date	Apr 9, 2024

Abstract

A positive electrode active material according to the present disclosure includes: a lithium composite oxide which includes Mn and at least one selected from the group consisting of F, Cl, and N, and S. The lithium composite oxide has a crystalline structure which belongs to the space group Fd-3m, and a relationship 1.40≤intensity ratio IMn1/IMn2≤1.90 is satisfied. The intensity ratio IMn1/IMn2 is a ratio of an intensity IMn1 to an intensity IMn2. The intensity IMn1 and the intensity IMn2 are intensities of a first proximity peak and a second proximity peak, respectively, of the Mn in a radial distribution function of the Mn included in the lithium composite oxide.

First claim

What is claimed is:

1. A positive electrode active material comprising:
a lithium composite oxide which includes:
Mn; and
at least one selected from the group consisting of F, Cl, N, and S,

wherein the lithium composite oxide has a crystalline structure which belongs to the space group Fd-3m, and
the following formula (I) is satisfied,
1.40≤intensity ratio I Mn1 /I Mn2 ≤1.90  (I)

where the intensity ratio I Mn1 /I Mn2 is a ratio of an intensity I Mn1 to an intensity I Mn2 ,
the intensity I Mn1 is an intensity of a first proximity peak of the Mn in a radial distribution function of the Mn included in the lithium composite oxide, and
the intensity I Mn2 is an intensity of a second proximity peak of the Mn in the radial distribution function of the Mn included in the lithium composite oxide.

2. The positive electrode active material according to claim 1 ,
wherein the intensity ratio I Mn1 /I Mn2 is greater than or equal to 1.49 and less than or equal to 1.83.

3. The positive electrode active material according to claim 2 ,
wherein the intensity ratio I Mn1 /I Mn2 is greater than or equal to 1.66 and less than or equal to 1.83.

4. The positive electrode active material according to claim 1 ,
wherein the lithium composite oxide includes F.

5. The positive electrode active material according to claim 1 ,
wherein the lithium composite oxide is represented by the following chemical formula (I),
Li x (Mn z Me 1-z )yO α Q β   (I)

where Me is at least one selected from the group consisting of Co, Ni, Fe, Cu, V, Nb, Mo, Ti, Cr, Zr, Zn, Na, K, Ca, Mg, Pt, Au, Ag, Ru, W, B, Si, P, and Al,
Q is at least one selected from the group consisting of F, Cl, N, and S,
x is greater than or equal to 1.05 and less than or equal to 1.4,
y is greater than or equal to 0.6 and less than or equal to 0.95,
z is greater than 0 and less than or equal to 1.0,
α is greater than or equal to 1.33 and less than 2, and
β is greater than 0 and less than or equal to 0.67.

6. The positive electrode active material according to claim 5 ,
wherein Me includes at least one selected from the group consisting of Co, Ni, P, and Al.

7. The positive electrode active material according to claim 5 ,
wherein Q includes F.

8. The positive electrode active material according to claim 5 ,
wherein z is greater than or equal to 0.875 and less than or equal to 1.0.

9. The positive electrode active material according to claim 8 ,
wherein z is 1.0.

10. The positive electrode active material according to claim 5 ,
wherein x is greater than or equal to 1.1 and less than or equal to 1.2, and
y is 0.8.

11. The positive electrode active material according to claim 5 ,
wherein α is greater than or equal to 1.67 and less than or equal to 1.9, and
β is greater than or equal to 0.1 and less than or equal to 0.33.

12. The positive electrode active material according to claim 5 ,
wherein x/y is greater than or equal to 1.3 and less than or equal to 1.9.

13. The positive electrode active material according to claim 5 ,
wherein α/β is greater than or equal to 5 and less than or equal to 19.

14. The positive electrode active material according to claim 5 ,
wherein (x+y)/(α+β) is greater than or equal to 0.75 and less than or equal to 1.2.

15. The positive electrode active material according to claim 1 ,
wherein the lithium composite oxide is included as a primary component.

16. A battery comprising:
a positive electrode including the positive electrode active material according to claim 1 ;
a negative electrode; and
an electrolyte.

17. The battery according to claim 16 ,
wherein the negative electrode includes at least one selected from the group consisting of:
(i) a negative electrode active material which occludes and releases lithium ions; and
(ii) a material from which a lithium metal is dissolved in the electrolyte during discharge and in which the lithium metal is precipitated during charge, and

the electrolyte is a nonaqueous electrolyte.

18. The battery according to claim 16 ,
wherein the negative electrode includes at least one selected from the group consisting of:
(i) a negative electrode active material which occludes and releases lithium ions; and
(ii) a material from which a lithium metal is dissolved in the electrolyte during discharge and in which the lithium metal is precipitated during charge, and

the electrolyte is a solid electrolyte.

19. The positive electrode active material according to claim 5 ,
where Me is at least one selected from the group consisting of Ni, Fe, Cu, V, Nb, Mo, Ti, Cr, Zr, Zn, Na, K, Ca, Mg, Pt, Au, Ag, Ru, W, B, Si, P, and Al.

Assignees

• Panasonic Ip Man Co Ltd

Inventors

• OMAE Takanori
• Natsui Ryuichi
• Ikeuchi Issei
• Nakura Kensuke

Classifications

• C01G53/82

  Compounds containing nickel, with or without oxygen or hydrogen, and containing two or more other elements · CPC title

• C01G51/82

  Compounds containing cobalt, with or without oxygen or hydrogen, and containing two or more other elements · CPC title

• C01G45/22 Primary

  Compounds containing manganese, with or without oxygen or hydrogen, and containing two or more other elements · CPC title

• H01M4/505 Primary

  of mixed oxides or hydroxides containing manganese for inserting or intercalating light metals, e.g. LiMn2O4 or LiMn2OxFy · CPC title

• C01G45/1228

  of the type (MnO2)-, e.g. LiMnO2 or Li(MxMn1-x)O2 · CPC title