Positive electrode active material, positive electrode using same, and lithium ion secondary battery

Patent metadata

Field	Value
Publication number	US-2016285073-A1
Application number	US-201615077491-A
Country	US
Kind code	A1
Filing date	Mar 22, 2016
Priority date	Mar 27, 2015
Publication date	Sep 29, 2016
Grant date	—

Abstract

A positive electrode active material includes: a lithium complex oxide expressed by chemical formula (1); and a highly thermal conductive compound having thermal conductivity of 10 W/m·K or more, the chemical formula (1) being
Li x M1 y M2 1-y O 2   (1)

where M1 is at least one metal selected from the group consisting of Ni, Co, and Mn, M2 is at least one metal selected from the group consisting of Al, Fe, Ti, Cr, Mg, Cu, Ga, Zn, Sn, B, V, Ca, and Sr, and x and y are numbers such that 0.05≦x≦1.2 and 0.3≦y≦1.

First claim

What is claimed is:

1 . A positive electrode active material comprising:
a lithium complex oxide expressed by chemical formula (1); and a highly thermal conductive compound having thermal conductivity of 10 W/m·K or more, the chemical formula (1) being
Li x M1 y M2 1-y O 2   (1)

where M1 is at least one metal selected from the group consisting of Ni, Co, and Mn, M2 is at least one metal selected from the group consisting of Al, Fe, Ti, Cr, Mg, Cu, Ga, Zn, Sn, B, V, Ca, and Sr, and x and y are numbers such that 0.05≦x≦1.2 and 0.3≦y≦1.

2 . The positive electrode active material according to claim 1 , wherein
the highly thermal conductive compound is at least one selected from the group consisting of AlN, BN, Si 3 N 4 , TiN, ZrN, VN, Cr 2 N, SiC, WC, TiC, TaC, ZrC, NbC, Mo 2 C, Cr 3 C 2 , TiB 2 , ZrB 2 , VB 2 , and NbB 2 .

3 . The positive electrode active material according to claim 1 , wherein
the highly thermal conductive compound is at least one selected from the group consisting of AlN, BN, Si 3 N 4 , TiN, ZrN, VN, NbN, and Cr 2 N.

4 . The positive electrode active material according to claim 1 , wherein
the lithium complex oxide is expressed by chemical formula (2):
Li a Ni 1-b M3 b O 2   (2)

where M3 is at least one metal selected from the group consisting of Co, Fe, Ti, Cr, Mg, Al, Cu, Ga, Mn, Zn, Sn, B, V, Ca, and Sr, and a and b are numbers such that 0.05≦a≦1.2 and 0≦b≦0.5.

5 . The positive electrode active material according to claim 1 , wherein
the highly thermal conductive compound has a content of 0.05 to 10 wt % with respect to the lithium complex oxide.

6 . The positive electrode active material according to claim 1 , wherein
the highly thermal conductive compound coats at least a pan of the lithium complex oxide.

7 . The positive electrode active material according to claim 1 , wherein
the highly thermal conductive compound has an average primary particle diameter of 10 to 500 am.

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

9 . A lithium ion secondary battery comprising:
the positive electrode according to claim 8 ; a negative electrode; and an electrolyte.

Assignees

• Tdk Corp

Inventors

• Fujita Shin
• Seki Hideaki

Classifications

• H01M10/0525

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

• H01M4/366 Primary

  as layered products · CPC title

• 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

• H01M10/613

  Cooling or keeping cold · CPC title

• H01M4/131 Primary

  Electrodes based on mixed oxides or hydroxides, or on mixtures of oxides or hydroxides, e.g. LiCoOx · CPC title