# US 10,122,014 B2 · Mixed metal oxide and sodium secondary battery

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- Number: US 10,122,014 B2
- Document ID: US10122014B2
- Status: Granted
- Kind: B2
- Application number: 12/865,976
- Filed: 2009-02-03
- Published: 2010-12-23
- Granted: 2018-11-06
- Earliest claimed: 2008-02-04
- Assignees: Sumitomo Chemical Company, Limited
- Applicants: Satoru Kuze; Masami Makidera; Taketsugu Yamamoto
- Inventors: Satoru Kuze; Masami Makidera; Taketsugu Yamamoto
- Web page: https://patentgrep.com/patent/US10122014B2

## CPC

- H01M 4/525: of mixed oxides or hydroxides containing iron, cobalt or nickel for inserting or intercalating light metals, e.g. LiNiO2, LiCoO2 or LiCoOxFy
- H01M 4/505: of mixed oxides or hydroxides containing manganese for inserting or intercalating light metals, e.g. LiMn2O4 or LiMn2OxFy
- H01M 10/054: Accumulators with insertion or intercalation of metals other than lithium, e.g. with magnesium or aluminium
- H01M 10/54: Reclaiming serviceable parts of waste accumulators
- H01M 50/414: Synthetic resins, e.g. thermoplastics or thermosetting resins
- H01M 50/451: comprising layers of only organic material and layers containing inorganic material
- H01M 50/491: Porosity
- Y02E 60/10: Energy storage using batteries
- Y02E 60/50: Fuel cells
- Y02W 30/84: Recycling of batteries or fuel cells
- H01M: PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- Y02E: REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02W: CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT

## Abstract

The present invention provides a sodium secondary battery capable of reducing the amount of lithium used, and ensuring a larger discharge capacity maintenance rate when having repeated a charge and discharge, as compared with conventional techniques; and a mixed metal oxide usable as the positive electrode active material therefor. A mixed metal oxide of the present invention comprises Na and M1 wherein M1 represents three or more elements selected from the group consisting of Mn, Fe, Co and Ni with an Na:M1 molar ratio being a:1 wherein a is a value falling within the range of more than 0.5 and less than 1. Also, a mixed metal oxide of the present invention is represented by the following formula (1): NaaM1O2 (1) wherein M1 and a each have the same meaning as above. The positive electrode active material for secondary batteries of the present invention comprises the mixed metal oxide above.

## Claims

### Claim 1

A mixed metal oxide represented by the following formula (1):
NaaM1O2 (1)
wherein M1 represents Mn, Fe and Ni, and a is a value falling within the range of from 0.7 to 0.9, and wherein a M1:Mn molar ratio is 1:b, and b is a value not less than 0.333 and 0.46 or less,
wherein a compositional ratio by mol of Mn:Fe:Ni is 1:x:y, wherein x is 1 and y is 0.17 to 1.

### Claim 2 (depends on 1)

A positive electrode active material for sodium secondary batteries which comprises the mixed metal oxide according to claim 1.

### Claim 3 (depends on 2)

A positive electrode for sodium secondary batteries which comprises the positive electrode active material according to claim 2.

### Claim 4 (depends on 3)

A sodium secondary battery having the positive electrode according to claim 3.

### Claim 5 (depends on 4)

The sodium secondary battery according to claim 4 further having a separator.

### Claim 6 (depends on 5)

The sodium secondary battery according to claim 5, wherein the separator is a separator having a porous laminated film in which a heat-resistant porous layer comprising a heat-resistant resin and porous film comprising a thermoplastic resin are stacked to each other.