# US 2018/0026314 A1 · Nonaqueous electrolyte secondary battery, battery assembly, and method of manufacturing the same

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- Number: US 2018/0026314 A1
- Document ID: US20180026314A1
- Status: Published application
- Kind: A1
- Application number: 15/539,247
- Filed: 2015-12-23
- Published: 2018-01-25
- Earliest claimed: 2014-12-26
- Assignees: Toyota Jidosha Kabushiki Kaisha
- Applicants: Toyota Jidosha Kabushiki Kaisha
- Inventors: Koji TAKAHATA
- Web page: https://patentgrep.com/patent/US20180026314A1

## CPC

- H01M 10/4235: {Safety or regulating additives or arrangements in electrodes, separators or electrolyte (H01M10/4242 takes precedence)}
- H01M 4/13: Electrodes for accumulators with non-aqueous electrolyte, e.g. for lithium-accumulators; Processes of manufacture thereof
- 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 4/587: for inserting or intercalating light metals
- H01M 4/62: Selection of inactive substances as ingredients for active masses, e.g. binders, fillers
- H01M 4/623: {fluorinated polymers}
- H01M 4/625: {Carbon or graphite}
- H01M 10/049: {Processes for forming or storing electrodes in the battery container}
- H01M 10/0567: characterised by the additives
- H01M 10/0569: characterised by the solvents
- H01M 10/058: Construction or manufacture
- H01M 2220/20: Batteries in motive systems, e.g. vehicle, ship, plane
- H01M 2300/0025: Organic electrolyte
- H01M 2300/004: Three solvents
- Y02E 60/10: Energy storage using batteries
- Y02P 70/50: Manufacturing or production processes characterised by the final manufactured product
- 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

## Abstract

Provided is a method of manufacturing a nonaqueous electrolyte secondary battery, the method including: constructing a battery assembly by using a positive electrode containing N-methyl-2-pyrrolidone and a nonaqueous electrolytic solution containing an oxalato complex compound. In the method, the battery assembly is constructed such that a following expression of 0.000036≦B1/A1≦0.001048 is satisfied, where A1 (ppm) represents a content of N-methyl-2-pyrrolidone per unit mass of a positive electrode active material layer, and B1 (mol/kg) represents a content of the oxalato complex compound per unit mass of a negative electrode active material.

## Claims

### Claim 1

A method of manufacturing a nonaqueous electrolyte secondary battery, the method comprising:
preparing a positive electrode that includes a positive electrode active material layer containing a positive electrode active material and N-methyl-2-pyrrolidone, a negative electrode that includes a negative electrode active material layer containing a negative electrode active material, and a nonaqueous electrolytic solution that contains an oxalato complex compound;
constructing a battery assembly using the positive electrode, the negative electrode, and the nonaqueous electrolytic solution; and
initially charging the battery assembly, wherein
the battery assembly is constructed such that a following expression of 0.000036≦B1/A1≦0.001048 is satisfied, where A1 ppm represents a content of N-methyl-2-pyrrolidone per unit mass of the positive electrode active material layer, and B1 mol/kg represents a content of the oxalato complex compound per unit mass of the negative electrode active material.

### Claim 2 (depends on 1)

The method according to claim 1, wherein
A1 is adjusted to be 33 ppm to 710 ppm.

### Claim 3 (depends on 1)

The method according to claim 1, wherein
B1 is adjusted to be 0.0258 mol/kg to 0.1378 mol/kg.

### Claim 4 (depends on 1)

The method according to claim 1, wherein
particles having a hollow structure are used as the positive electrode active material, the hollow structure including: a shell portion; and a hollow portion that is formed in the shell portion.

### Claim 5 (depends on 1)

The method according to claim 1, wherein
at least one of lithium bis(oxalato)borate and lithium difluorobis(oxalato)phosphate is used as the oxalato complex compound.

### Claim 6

A battery assembly comprising:
a positive electrode that includes a positive electrode active material layer containing a positive electrode active material and N-methyl-2-pyrrolidone;
a negative electrode that includes a negative electrode active material layer containing a negative electrode active material; and
a nonaqueous electrolytic solution that contains an oxalato complex compound, wherein
a following expression of 0.000036≦B2/A2′≦0.001048 is satisfied, where A2′ ppm represents a content of N-methyl-2-pyrrolidone per unit mass in one of five regions which is most distant from the negative electrode, the five regions being equally divided from the positive electrode active material layer in a thickness direction, and B2 mol/kg represents a content of the oxalato complex compound per unit mass of the negative electrode active material.

### Claim 7

A nonaqueous electrolyte secondary battery comprising:
a positive electrode that includes a positive electrode active material layer containing a positive electrode active material;
a negative electrode that includes a negative electrode active material layer containing a negative electrode active material; and
a nonaqueous electrolytic solution, wherein
the negative electrode active material includes a film, and
the film contains a component derived from an oxalato complex compound and a component derived from N-methyl-2-pyrrolidone.

### Claim 8 (depends on 7)

The nonaqueous electrolyte secondary battery according to claim 7, wherein
the positive electrode active material layer contains N-methyl-2-pyrrolidone, and
the nonaqueous electrolytic solution contains the oxalato complex compound.

### Claim 9 (depends on 7)

The nonaqueous electrolyte secondary battery according to claim 7, wherein
the positive electrode active material has a hollow structure including: a shell portion; and a hollow portion that is formed in the shell portion.