Positive electrode active material and secondary battery

Patent metadata

Field	Value
Publication number	US-12119490-B2
Application number	US-201917263670-A
Country	US
Kind code	B2
Filing date	Feb 21, 2019
Priority date	Jul 31, 2018
Publication date	Oct 15, 2024
Grant date	Oct 15, 2024

Abstract

Provided is a positive electrode active material including a first lithium oxide represented by Li 2+x Ni 1−y A 1 y O 2−z A 2 z , where −0.5≤x≤0.3, 0≤y≤0.1, and 0≤z≤0.3. Here, at least one of y and z is not 0. A 1 includes at least one selected from the group consisting of Ga, Bi, Ba, Y, Sn, Ca, W, and Ta. A 2 includes at least one selected from the group consisting of halogen elements and S.

First claim

What is claimed is:

1. A positive electrode active material for secondary batteries, the positive electrode active material comprising:
a first lithium oxide represented by a composition formula (1): Li 2+x Ni 1−y A 1 y O 2−z A 2 z , where −0.5≤x≤0.3, 0≤y≤0.1, and 0≤z≤0.3,
at least one of y and z being not 0,
A 1 including at least one selected from the group consisting of Ba, Ca, W, and Ta,
A 2 including at least one selected from the group consisting of halogen elements and S.

2. The positive electrode active material according to claim 1 , wherein the A 1 further includes Ga.

3. The positive electrode active material according to claim 1 , wherein the A 2 includes at least F.

4. The positive electrode active material according to claim 3 , further comprising LiF.

5. The positive electrode active material according to claim 4 , wherein the LiF is localized on a surface of the first lithium oxide.

6. The positive electrode active material according to claim 1 , wherein
the first lithium oxide is mixed with a second lithium oxide represented by a composition formula (2): Li a M 1 O 2 , where 0.95≤a≤1.2,
M 1 including at least one selected from the group consisting of Ni, Mn, and Co.

7. The positive electrode active material according to claim 6 , wherein
the second lithium oxide is represented by a composition formula (2a): Li a Ni b Co c M 2 1−b−c O 2 , where 0.95≤a≤1.2, 0.3≤b≤0.95, 0<c≤0.5, and b+c<1,
M 2 including at least one selected from the group consisting of Mn and Al.

8. The positive electrode active material according to claim 7 , wherein the first lithium oxide is contained in a proportion of 1 to 20 mass % in the positive electrode active material as a whole.

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

10. The secondary battery according to claim 9 , wherein
the negative electrode includes a negative electrode active material, and
the negative electrode active material includes an alloy-type material containing at least one element selected from the group consisting of Si, Sn, Ga, and In.

11. The secondary battery according to claim 9 , wherein the positive electrode includes an amorphous phase mainly composed of Li 1+x Ni 1−y A 1 y O 2−z A 2 z wherein a half width w of a diffraction peak corresponding to the (101) plane of the first lithium oxide obtained by X-ray diffractometry satisfies w>0.5°.

12. A positive electrode active material for secondary batteries, the positive electrode active material comprising:
a first lithium oxide represented by a composition formula (1): Li 2+x Ni 1−y A 1 y O 2−z A 2 z , where −0.5≤x≤0.3, 0≤y≤0.1, and 0<z≤0.3,
A 1 including at least one selected from the group consisting of Ga, Bi, Ba, Y, Sn, Ca, W, and Ta,
A 2 including at least one selected from the group consisting of halogen elements and S,
wherein the first lithium oxide has a crystal structure belonging to a space group Immm.

Assignees

• Panasonic Ip Man Co Ltd

Inventors

• Kuroda Kosuke
• Kawada Hiroshi
• Fukui Atsushi

Classifications

• C01G53/82

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

• H01M2004/028

  Positive electrodes · CPC title

• H01M10/0525 Primary

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

• H01M4/582

  Halogenides · CPC title

• H01M4/505

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