# US 10,374,205 B2 · Nonaqueous electrolyte secondary battery

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- Number: US 10,374,205 B2
- Document ID: US10374205B2
- Status: Granted
- Kind: B2
- Application number: 15/556,929
- Filed: 2016-03-08
- Published: 2018-02-01
- Granted: 2019-08-06
- Earliest claimed: 2015-03-31
- Assignees: Sanyo Electric Co., Ltd.
- Applicants: SANYO Electric Co., Ltd.
- Inventors: Fumiharu Niina; Daisuke Nishide; Atsushi Fukui
- Web page: https://patentgrep.com/patent/US10374205B2

## CPC

- H01M 10/052: Li-accumulators
- H01M 4/13: Electrodes for accumulators with non-aqueous electrolyte, e.g. for lithium-accumulators; Processes of manufacture thereof
- H01M 4/134: Electrodes based on metals, Si or alloys
- H01M 4/136: Electrodes based on inorganic compounds other than oxides or hydroxides, e.g. sulfides, selenides, tellurides, halogenides or LiCoFy
- H01M 4/38: of elements or alloys
- H01M 4/483: {for non-aqueous cells (H01M4/485 takes 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
- H01M 50/417: Polyolefins
- H01M 50/491: Porosity
- H01M 4/133: Electrodes based on carbonaceous material, e.g. graphite-intercalation compounds or CFx
- H01M 2004/028: {Positive electrodes}
- H01M 2220/20: Batteries in motive systems, e.g. vehicle, ship, plane
- H01M 2220/30: Batteries in portable systems, e.g. mobile phone, laptop
- 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

It is an object of the present invention to improve the low-temperature output characteristics of a nonaqueous electrolyte secondary battery. A nonaqueous electrolyte secondary battery according to an embodiment includes an electrode assembly having a structure in which a positive electrode and a negative electrode are stacked with a porous separator provided therebetween. The positive electrode contains tungsten and a phosphate compound. The separator contains a material having higher oxidation resistance than a polyethylene and has a pore distribution peak sharpness index of 40 or more in the range of 0.01 μm to 10 μm as calculated using formula 1: formula 1: pore distribution peak sharpness index=(peak value of Log differential pore volume)/(difference between maximum pore size and minimum pore size at position corresponding to ½ peak value of Log differential pore volume).

## Claims

### Claim 1

A nonaqueous electrolyte secondary battery comprising an electrode assembly having a structure in which a positive electrode and a negative electrode are stacked with a porous separator provided therebetween,
wherein the positive electrode contains WO3 and Li3PO4, and the separator contains a material having higher oxidation resistance than a polyethylene and has a pore distribution peak sharpness index of 40 or more in the range of 0.01 μm to 10 μm as calculated using formula 1:
pore distribution peak sharpness index=(peak value of Log differential pore volume)/(difference between maximum pore size and minimum pore size at position corresponding to ½ peak value of Log differential pore volume). formula 1:

### Claim 2 (depends on 1)

The nonaqueous electrolyte secondary battery according to claim 1, wherein the separator is composed of a polypropylene serving as a main component.

### Claim 3 (depends on 1)

The nonaqueous electrolyte secondary battery according to claim 1, wherein the separator is formed of a single layer of a polypropylene.

### Claim 4 (depends on 1)

The nonaqueous electrolyte secondary battery according to claim 1, wherein the negative electrode includes a surface film containing tungsten.

### Claim 5 (depends on 4)

The nonaqueous electrolyte secondary battery according to claim 4, wherein the tungsten contained in the surface film originates from the positive electrode.