Lithium-ion battery and method for producing same

Patent metadata

Field	Value
Publication number	US-9865872-B2
Application number	US-201314376872-A
Country	US
Kind code	B2
Filing date	Feb 1, 2013
Priority date	Feb 6, 2012
Publication date	Jan 9, 2018
Grant date	Jan 9, 2018

Abstract

The present invention relates to a lithium-ion battery. The lithium-ion battery comprises a positive electrode containing, as a principal component, a lithium oxide having a layered rock-salt structure and represented by chemical formula: Li x M 1 y M 2 z O 2-d . In this chemical formula, 1.16≦x≦1.32, 0.33≦y≦0.63, 0.06≦z≦0.50, M 1 represents a metal ion selected from Mn, Ti and Zr, or a mixture thereof, and M 2 represents a metal ion selected from Fe, Co, Ni and Mn, or a mixture thereof. The lithium-ion battery also comprises a negative electrode containing, as a principal component, a material capable of intercalating/deintercalating lithium ions, wherein peroxide ion(s) (O 2 2− ) are contained in the positive electrode.

First claim

The invention claimed is:

1. A lithium-ion battery comprising
a positive electrode containing, as a principal component, a lithium oxide having a layered rock-salt structure and represented by chemical formula: Li x M 1 y M 2 z O 2-d , wherein 1.16≦x≦1.32, 0.33≦y≦0.63, 0.06≦z≦0.50, M 1 represents a metal ion selected from Mn, Ti and Zr, or a mixture thereof, and M 2 represents a metal ion selected from Fe, Co, Ni and Mn, or a mixture thereof; and
a negative electrode containing, as a principal component, a material capable of intercalating/deintercalating lithium ions, wherein peroxide ion(s) (O 2 2− ) are contained in the positive electrode.

2. The lithium-ion battery according to claim 1 , wherein the M 1 represents Mn or a mixture of Mn and Ti, and the M 2 represents Fe or a mixture of Fe and Ni.

3. The lithium-ion battery according to claim 1 or 2 , wherein the positive electrode has been subjected to an oxidation treatment, and peroxide ion(s) (O 2 2− ) are contained in the positive electrode after the oxidation treatment.

4. The lithium-ion battery according to claim 3 , wherein the oxidation treatment is performed by performing charge/discharge at a temperature of 10° C. or less, and then performing charge/discharge at an elevated temperature.

5. The lithium-ion battery according to claim 4 , wherein an upper limit to the voltage of the positive electrode during charge is fixed at 4.6 V or more relative to lithium metal in the oxidation treatment.

6. The lithium-ion battery according to claim 1 , wherein the negative electrode contains graphite as the principal component.

7. A method for producing a lithium-ion battery according to claim 1 , comprising a step of:
generating peroxide ion(s) (O 2 2− ) in the positive electrode by an oxidation treatment in which a charge/discharge is performed at a temperature of 10° C. or less, and then a charge/discharge is performed at an elevated temperature.

8. The method for producing a lithium-ion battery according to claim 7 , wherein an upper limit to the voltage of the positive electrode during charge is fixed at 4.6 V or more relative to lithium metal in the oxidation treatment.

Assignees

• Nakahara Kentaro
• Hattori Sadanori
• Nec Corp

Inventors

• Nakahara Kentaro
• Hattori Sadanori

Classifications

• H01M10/058

  Construction or manufacture · CPC title

• H01M4/525

  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

• H01M10/04

  Construction or manufacture in general (H01M10/058, H01M10/12, H01M10/28, H01M10/38 take precedence) · CPC title

• Y10T29/49108

  Electric battery cell making · CPC title