Cathode active material for lithium ion battery, cathode material for lithium ion battery, and lithium ion battery

Patent metadata

Field	Value
Publication number	US-9899664-B2
Application number	US-201615196709-A
Country	US
Kind code	B2
Filing date	Jun 29, 2016
Priority date	Aug 4, 2015
Publication date	Feb 20, 2018
Grant date	Feb 20, 2018

Abstract

Provided are a cathode active material with excellent high-temperature life that suppresses the elution of metal elements from the cathode active metal and the generation of different phase therein and exhibits a high potential, as well as a high-voltage lithium ion battery that achieves excellent high-temperature life by applying such a cathode active material. The cathode active material for a lithium ion battery is represented by a compositional formula Li a Ni x Mn y M z O 4-δ F δ (where M is one or more elements selected from the group consisting of Ti, Ge, Mg, Co, Fe, Cu, and Al, and a, x, y, z, and δ satisfy the following formulas: 1≦a<1.08, 0.4≦x<0.5, 0<z≦0.3, a+x+y+z=3, and 0<δ≦0.2).

First claim

What is claimed is:

1. A cathode active material for a lithium ion battery,
the cathode active material being represented by a compositional formula Li a Ni x Mn y M z O 4-δ F δ ,
where M is one or more elements selected from the group consisting of Ti, Ge, Mg, Co, Fe, Cu and Al, and a, x, y, z and δ satisfy the following formulas:
1≦ a< 1.08, 0.4≦ x< 0.5, 0< z≦ 0.3, a+x+y+z= 3, and 0<δ≦0.2.

2. The cathode active material for a lithium ion battery according to claim 1 , wherein
M contains Ti, and one or more elements selected from Ge, Mg, Co, Fe, Cu and Al, and
a Ti content in M is 50% or more based on moles.

3. The cathode active material for a lithium ion battery according to claim 1 , wherein
M contains Ge, and one or more elements selected from Ti, Mg, Co, Fe, Cu and Al, and
a Ge content in M is 50% or more based on moles, and z satisfies the formula of 0<z≦0.2.

4. The cathode active material for a lithium ion battery according to claim 1 , wherein
M contains Co or Fe, and one or more elements selected from Ti, Ge, Mg, Cu and Al,
a content of either Co or Fe in M is 50% or more based on moles, and
z satisfies the formula of 0<z≦0.15.

5. The cathode active material for a lithium ion battery according to claim 1 , wherein
M contains Mg or Cu, and one or more elements selected from Ti, Ge, Co, Fe and Al,
a content of either Mg or Cu in M is 50% or more based on moles, and
z satisfies the formula of 0<z≦0.1.

6. The cathode active material for a lithium ion battery according to claim 1 , wherein
M contains Al, and one or more elements selected from Ti, Ge, Mg, Co, Fe and Cu,
a content of Al in M is 50% or more based on moles, and
z satisfies the formula of 0<z≦0.05.

7. The cathode active material for a lithium ion battery according to claim 1 , wherein
the cathode active material has a cubic spinel structure.

8. A cathode material for a lithium ion battery comprising:
the cathode active material for a lithium ion battery according to claim 1 ; and
an aluminum oxide layer covering a surface of the cathode active material.

9. A lithium ion battery, comprising:
a cathode including the cathode active material for a lithium ion battery according to claim 1 ;
an anode; and
an electrolyte.

Assignees

• Hitachi Chemical Co Ltd

Inventors

• Yamaki Takahiro
• Oda Masanari

Classifications

• H01M4/485

  of mixed oxides or hydroxides for inserting or intercalating light metals, e.g. LiTi2O4 or LiTi2OxFy (H01M4/505, H01M4/525 take precedence) · CPC title

• H01M10/0525

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

• H01M4/525 Primary

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

• H01M4/1315 Primary

  containing halogen atoms, e.g. LiCoOxFy · CPC title