Cathode active material, cathode, and nonaqueous secondary battery

Patent metadata

Field	Value
Publication number	US-9350021-B2
Application number	US-201214372684-A
Country	US
Kind code	B2
Filing date	Dec 28, 2012
Priority date	Jan 17, 2012
Publication date	May 24, 2016
Grant date	May 24, 2016

Abstract

Provided is a cathode active material which is superior in safety and cost and makes it possible to provide a nonaqueous secondary battery having a long life. The cathode active material has a composition represented by the following formula (1):

LiMn 1-x M x P 1-y Al y O 4   (1)

(wherein M is at least one selected from the group consisting of Ti, V, Zr, Sn and Y, x is in a range of 0<x≦0.5, and y is in a range of 0<y≦0.25).

First claim

The invention claimed is:

1. A cathode active material having a composition represented by the following formula (1):
LiMn 1-x M x P 1-y Al y O 4   (1)

(wherein M is at least one selected from the group consisting of Ti, V, Zr, Sn and Y, x is in a range of 0<x<0.5, and y is in a range of 0<y<0.25).

2. The cathode active material according to claim 1 ,
wherein the cathode active material has a volume change ratio of 8% or lower caused by Li intercalation/deintercalation.

3. The cathode active material according to claim 1 ,
wherein M is Zr, and
x is in a range of 0.01≦x≦0.25.

4. A cathode comprising:
the cathode active material according to any one of claims 1 ;
an electrically conductive material; and
a binder.

5. A nonaqueous secondary battery comprising:
the cathode according to claim 4 ;
an anode;
an electrolyte; and
a separator.

Assignees

• Sharp Kk

Inventors

• Ohira Koji
• Nishijima Motoaki
• Kamimura Yuichi

Classifications

• Y02E60/10

  Energy storage using batteries · CPC title

• H01M4/5825 Primary

  Oxygenated metallic salts or polyanionic structures, e.g. borates, phosphates, silicates, olivines · CPC title

• C01B25/45

  containing plural metal, or metal and ammonium · CPC title

• H01M10/052

  Li-accumulators · CPC title

• H01M2220/30

  Batteries in portable systems, e.g. mobile phone, laptop · CPC title