# US 9,437,902 B2 · Method of manufacturing nonaqueous electrolyte secondary battery

> Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt

- Number: US 9,437,902 B2
- Document ID: US9437902B2
- Status: Granted
- Kind: B2
- Application number: 14/423,645
- Filed: 2013-04-30
- Published: 2015-07-23
- Granted: 2016-09-06
- Earliest claimed: 2012-09-07
- Assignees: Toyota Jidosha Kabushiki Kaisha
- Applicants: Toyota Jidosha Kabushiki Kaisha
- Inventors: Hiroshi Onizuka
- Web page: https://patentgrep.com/patent/US9437902B2

## CPC

- H01M 10/0567: characterised by the additives
- H01M 4/13: Electrodes for accumulators with non-aqueous electrolyte, e.g. for lithium-accumulators; Processes of manufacture thereof
- H01M 10/0413: {Large-sized flat cells or batteries for motive or stationary systems with plate-like electrodes}
- H01M 10/0431: {Cells with wound or folded electrodes (H01M10/045 takes precedence)}
- H01M 10/0436: {Small-sized flat cells or batteries for portable equipment}
- H01M 10/052: Li-accumulators
- H01M 10/0568: characterised by the solutes
- H01M 10/0569: characterised by the solvents
- H01M 10/0587: of accumulators having only wound construction elements, i.e. wound positive electrodes, wound negative electrodes and wound separators
- H01M 10/4235: {Safety or regulating additives or arrangements in electrodes, separators or electrolyte (H01M10/4242 takes precedence)}
- H01M 10/446: {Initial charging measures}
- H01M 4/131: Electrodes based on mixed oxides or hydroxides, or on mixtures of oxides or hydroxides, e.g. LiCoOx
- H01M 4/133: Electrodes based on carbonaceous material, e.g. graphite-intercalation compounds or CFx
- H01M 2004/027: {Negative electrodes}
- 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
- H01M 2300/0037: Mixture of solvents
- H01M 2300/0042: Four or more solvents
- Y02E 60/10: Energy storage using batteries
- Y02P 70/50: Manufacturing or production processes characterised by the final manufactured product
- Y02T 10/70: Energy storage systems for electromobility, e.g. batteries
- Y10T 29/49115: including coating or impregnating
- 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
- Y02P: CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02T: CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y10T: TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION

## Abstract

The manufacturing method of the invention includes the steps of: providing a positive electrode and a negative electrode (S10), a sodium ingredient being included in either the positive electrode or the negative electrode; producing an electrode assembly from the provided positive electrode and negative electrode (S20); producing a battery assembly in which the electrode assembly is housed in a battery case (S30); injecting a nonaqueous electrolyte solution into the battery case (S40), the nonaqueous electrolyte solution including at least lithium bis(oxalato)borate, a fluorophosphate compound, a carbonate solvent and an ether solvent, and the amount of ether solvent included in the nonaqueous electrolyte solution being less than 10 vol % when the amount of nonaqueous solvent included in the nonaqueous electrolyte solution is set to 100 vol %; and charging and discharging the battery assembly (S50).

## Claims

### Claim 1

A method of manufacturing a nonaqueous electrolyte secondary battery, comprising the steps of:
providing a positive electrode that contains a positive electrode active material and a negative electrode that contains a negative electrode active material, at least one of the provided positive electrode and negative electrode including a sodium (Na) ingredient as an incidental impurity;
producing an electrode assembly from the provided positive electrode and negative electrode;
producing a battery assembly in which the electrode assembly is housed in a battery case;
injecting a nonaqueous electrolyte solution into the battery case, the nonaqueous electrolyte solution including at least, as additives, lithium bis(oxalato)borate and a fluorophosphate compound in which fluorine and phosphorus serve as structural elements and, as nonaqueous solvents, a carbonate solvent and an ether solvent, a ratio (A/B) between the molar concentration A of the fluorophosphate compound and the molar concentration B of the lithium bis(oxalato)borate being from 2.5 to 5, and the amount of ether solvent included in the nonaqueous electrolyte solution being less than 10 vol % when the amount of nonaqueous solvent included in the nonaqueous electrolyte solution is set to 100 vol %; and
charging the battery assembly to a predetermined charge voltage, then discharging the battery assembly to a predetermined discharge voltage.

### Claim 2 (depends on 1)

The manufacturing method according to claim 1, wherein a chain ether is used as the ether solvent.

### Claim 3 (depends on 2)

The manufacturing method according to claim 2, wherein dimethoxyethane and/or 1,2-dimethoxypropane is used as the chain ether.

### Claim 4 (depends on 1)

The manufacturing method according to claim 1, wherein the fluorophosphate compound is lithium difluorophosphate, the concentration of the lithium difluorophosphate in the nonaqueous electrolyte solution being from 0.03 mol/L to 0.08 mol/L.

### Claim 5 (depends on 1)

The manufacturing method according to claim 1, wherein the concentration of lithium bis(oxalato)borate in the nonaqueous electrolyte solution is from 0.01 mol/L to 0.03 mol/L.

### Claim 6 (depends on 1)

The manufacturing method according to claim 1, wherein a wound electrode assembly, which is obtained by stacking together a positive electrode formed as a sheet and a negative electrode formed as a sheet to obtain an electrode assembly, and winding the electrode assembly in a lengthwise direction of the electrode assembly, is used as the electrode assembly.

### Claim 7 (depends on 1)

The manufacturing method according to claim 1, wherein a lithium-containing compound capable of intercalating and deintercalating lithium ions is used as the positive electrode active material.

### Claim 8 (depends on 1)

A nonaqueous electrolyte secondary battery obtained by the manufacturing method according to claim 1.

### Claim 9

A nonaqueous electrolyte solution adapted for use in nonaqueous electrolyte secondary batteries, comprising at least, as additives, lithium bis(oxalato)borate and a fluorophosphate compound in which fluorine and phosphorus serve as structural elements and, as nonaqueous solvents, a carbonate solvent and an ether solvent,
wherein a ratio (A/B) between the molar concentration A of the fluorophosphate compound and the molar concentration B of the lithium bis(oxalato)borate is from 2.5 to 5, and
the amount of ether solvent included in the nonaqueous electrolyte solution is less than 10vol % when the amount of nonaqueous solvent included in the nonaqueous electrolyte solution is set to 100 vol %.

### Claim 10 (depends on 1)

The manufacturing method according to claim 1, wherein the nonaqueous solvent consists of the carbonate solvent and the ether solvent.