# US 2017/0256801 A1 · Nonaqueous electrolyte secondary battery

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- Number: US 2017/0256801 A1
- Document ID: US20170256801A1
- Status: Published application
- Kind: A1
- Application number: 15/503,842
- Filed: 2015-08-25
- Published: 2017-09-07
- Earliest claimed: 2014-09-26
- Assignees: Sanyo Electric Co., Ltd.
- Applicants: SANYO Electric Co., Ltd.
- Inventors: Masanori Sugimori; Natsumi Goto; Katsunori Yanagida
- Web page: https://patentgrep.com/patent/US20170256801A1

## CPC

- H01M 4/628: {Inhibitors, e.g. gassing inhibitors, corrosion inhibitors}
- H01M 4/131: Electrodes based on mixed oxides or hydroxides, or on mixtures of oxides or hydroxides, e.g. LiCoOx
- H01M 4/366: {as layered products}
- H01M 4/485: of mixed oxides or hydroxides for inserting or intercalating light metals, e.g. LiTi2O4 or LiTi2OxFy (H01M4/505, H01M4/525 take precedence)
- H01M 4/505: of mixed oxides or hydroxides containing manganese for inserting or intercalating light metals, e.g. LiMn2O4 or LiMn2OxFy
- 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 10/0525: Rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodes; Lithium-ion batteries
- H01M 50/4295: {Natural cotton, cellulose or wood}
- H01M 50/44: Fibrous material
- Y02E 60/10: Energy storage using batteries
- Y02T 10/70: Energy storage systems for electromobility, e.g. batteries
- 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
- Y02T: CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION

## Abstract

Provided is a nonaqueous electrolyte secondary battery in which the generation of gas is suppressed in charge/discharge cycles. The nonaqueous electrolyte secondary battery includes a positive electrode, a negative electrode, a separator placed therebetween, and a nonaqueous electrolyte. The positive electrode includes a positive electrode active material containing a lithium transition metal oxide. The positive electrode contains tungsten oxide. Tungsten is present in the form of a solid solution in the lithium transition metal oxide. Tungsten oxide is attached to the surface of the lithium transition metal oxide. The separator contains cellulose. Tungsten in tungsten oxide contained in the positive electrode is preferably 0.01 mole percent to 3.0 mole percent with respect to transition metals, excluding lithium, in the lithium transition metal oxide.

## Claims

### Claim 1

A nonaqueous electrolyte secondary battery comprising a positive electrode, a negative electrode, a separator placed between the positive electrode and the negative electrode, and a nonaqueous electrolyte,
wherein the positive electrode includes a positive electrode active material containing a lithium transition metal oxide,
the positive electrode contains tungsten oxide,
tungsten is present in the form of a solid solution in the lithium transition metal oxide, tungsten oxide is attached to the surface of the lithium transition metal oxide, and
the separator contains cellulose.

### Claim 2 (depends on 1)

The nonaqueous electrolyte secondary battery according to claim 1, wherein a tungsten element in tungsten oxide contained in the positive electrode is 0.01 mole percent to 3.0 mole percent with respect to transition metals, excluding lithium, in the lithium transition metal oxide.

### Claim 3 (depends on 1)

The nonaqueous electrolyte secondary battery according to claim 1, wherein a tungsten element present in the form of a solid solution in the lithium transition metal oxide is 0.01 mole percent to 3.0 mole percent with respect to the transition metals, excluding lithium, in the lithium transition metal oxide.

### Claim 4 (depends on 1)

The nonaqueous electrolyte secondary battery according to claim 1, wherein the tungsten oxide includes WO3.

### Claim 5 (depends on 1)

The nonaqueous electrolyte secondary battery according to claim 1, wherein the lithium transition metal oxide contains nickel, cobalt, and manganese.

### Claim 6 (depends on 1)

The nonaqueous electrolyte secondary battery according to claim 1, wherein the negative electrode contains lithium titanate.