# US 2019/0173085 A1 · Nonaqueous electrolyte secondary battery

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- Number: US 2019/0173085 A1
- Document ID: US20190173085A1
- Status: Published application
- Kind: A1
- Application number: 15/772,701
- Filed: 2016-11-21
- Published: 2019-06-06
- Earliest claimed: 2015-11-30
- Assignees: Panasonic Intellectual Property Management Co., Ltd.
- Applicants: Panasonic Intellectual Property Management Co., Ltd.
- Inventors: Masanori Sugimori; Natsumi Goto; Kouhei Tuduki; Katsunori Yanagida
- Web page: https://patentgrep.com/patent/US20190173085A1

## 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 4/366: {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 4/62: Selection of inactive substances as ingredients for active masses, e.g. binders, fillers
- H01M 10/0525: Rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodes; Lithium-ion batteries
- 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

A nonaqueous electrolyte secondary battery according to the present invention includes a positive electrode, a negative electrode, a separator placed between the positive electrode and the negative electrode, and a nonaqueous electrolyte. The positive electrode contains a first lithium transition metal oxide in which Ni accounts for 30 mole percent or more of the total molar amount of metal elements excluding Li; a second lithium transition metal oxide in which Co and Ni account for 60 mole percent or more and 20 mole percent or less, respectively, of the total molar amount of metal elements excluding Li; and tungsten element. The negative electrode contains a lithium-titanium composite oxide.

## Claims

### Claim at position 1

1-6. (canceled)

### Claim 7

A nonaqueous electrolyte secondly 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 contains a first lithium transition metal oxide in which Ni accounts for 30 mole percent or more of the total molar amount of metal elements excluding Li; a second lithium transition metal oxide in which Co and Ni account for 60 mole percent or more and 20 mole percent or less, respectively, of the total molar amount of metal elements excluding Li: and tungsten element,
the negative electrode contains a lithium-titanium composite oxide, and
a portion of the tungsten element contained in the positive electrode is present in the form of a solid solution in at least one of the first lithium transition metal oxide and the second lithium transition metal oxide and another portion of the tungsten element contained in the positive electrode is present in the form of a tungsten compound attached to the surface of at least one of the first lithium transition metal oxide and the second lithium transition metal oxide.

### Claim 8 (depends on 7)

The nonaqueous electrolyte secondary battery according to claim 7, wherein tungsten element in the tungsten compound accounts for 0.01 mole percent to 3.0 mole percent of the total molar amount of metal elements, excluding Li, in the lithium transition metal oxide.

### Claim 9 (depends on 7)

The nonaqueous electrolyte secondary battery according to claim 7, wherein tungsten element present in the form of a solid solution in the lithium transition metal oxide accounts for 0.01 mole percent to 3.0 mole percent of the total molar amount of metal elements, excluding Li, in the lithium transition metal oxide.

### Claim 10 (depends on 7)

The nonaqueous electrolyte secondary battery according to claim 7, wherein the tungsten compound is tungsten oxide.

### Claim 11 (depends on 10)

The nonaqueous electrolyte secondary battery according to claim 10, wherein the tungsten oxide is WO3.