Positive electrode active substance containing lithium-containing metal oxide

Patent metadata

Field	Value
Publication number	US-9373844-B2
Application number	US-201314080474-A
Country	US
Kind code	B2
Filing date	Nov 14, 2013
Priority date	Jul 1, 2010
Publication date	Jun 21, 2016
Grant date	Jun 21, 2016

Abstract

A positive electrode active substance including a lithium-containing metal oxide represented by the following general formula (1):

LiFe 1-x M x P 1-y Si y O 4   (1)
wherein M represents an element selected from Sn, Zr, Y, and Al; 0<x<1; and 0<y<1, wherein the lithium-containing metal oxide has a lattice constant and a half value width of a diffraction peak of a (011) plane.

First claim

What is claimed is:

1. A positive electrode active substance comprising a lithium-containing metal oxide represented by the following general formula (1):
LiFe 1-x M x P 1-y Si y O 4   (1)

wherein M represents an element selected from Sn, Zr, Y, and Al; 0<x<1; and 0<y<1,
wherein the lithium-containing metal oxide has a lattice constant and a half value width of a diffraction peak of a (011) plane, providing a capacity retaining ratio of higher than 81.0% after 100 times of charging and discharging of a cell having a positive electrode comprising the lithium-containing metal oxide, an electrolyte, and a counterelectrode;
wherein the positive electrode consists about 10 wt % of acetylene black, about 10 wt % of fluororesin, and about 80 wt % of lithium-containing metal oxide; and is 20 mg in weight;
the electrolyte consists 50 vol % of ethylene carbonate into which 1 mol/liter of LiPF 6 is dissolved and 50 vol % of diethyl carbonate, and is 30 ml in volume; and
the counterelectrode consists metal lithium, and

the cell is charged and discharged 100 times under the following conditions: in an environment of 25° C., with a charging and discharging current of 0.1 mA, with an electric potential of 4.0 V at the end of the charge of the cell, and with an electric potential of 2.0 V at the end of the discharge of the cell.

2. The positive electrode active substance of claim 1 , wherein the unit lattice is included in a range of 291.4 to 300.0 Å 3 or in a range of 285.0 to 291.3 Å 3 , and the half value width of a diffraction peak of a (011) plane is 0.20° or more.

3. The positive electrode active substance of claim 1 , wherein the capacity retaining ratio is 94.5% or more.

4. A positive electrode active substance comprising a lithium-containing metal oxide represented by the following general formula (1):
LiFe 1-x M x P 1-y Si y O 4   (1)

wherein M represents an element selected from Sn, Zr, Y, and Al; 0<x<1; and 0<y<1, having one volume of a unit lattice included in a range of 291.4 to 300.0 Å 3 or in a range of 285.0 to 291.3 Å 3 , and having a half value width of a diffraction peak of a (011) plane of 0.20° or more.

5. A positive electrode comprising the positive electrode active substance of claim 1 , an electroconductive material, and a binder.

6. A non-aqueous electrolyte secondary battery comprising the positive electrode of claim 5 containing the positive electrode active substance, a negative electrode, an electrolyte, and a separator.

7. A positive electrode comprising the positive electrode active substance of claim 4 , an electroconductive material, and a binder.

8. A non-aqueous electrolyte secondary battery comprising the positive electrode of claim 7 containing the positive electrode active substance, a negative electrode, an electrolyte, and a separator.

Assignees

• Sharp Kk

Inventors

• Ohira Koji
• Nishijima Motoaki
• Sueki Toshitsugu
• Esaki Shougo
• Tanaka Isao
• Koyama Yukinori
• Tanaka Katsuhisa
• Fujita Koji
• Murai Shunsuke

Classifications

• Y02E60/122

  Cross-Sectional Technologies · mapped topic

• H01B1/22

  the conductive material comprising metals or alloys · CPC title

• H01M4/622 Primary

  being polymers · CPC title

• H01M4/621

  Binders · CPC title

• H01M4/5825

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