# US 2019/0245173 A1 · Nonaqueous electrolyte secondary battery

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- Number: US 2019/0245173 A1
- Document ID: US20190245173A1
- Status: Published application
- Kind: A1
- Application number: 16/387,592
- Filed: 2019-04-18
- Published: 2019-08-08
- Earliest claimed: 2016-11-18
- Assignees: Kabushiki Kaisha Toshiba; Toshiba Infrastructure Systems & Solutions Corporation
- Applicants: Kabushiki Kaisha Toshiba; Toshiba Infrastructure Systems & Solutions Corporation
- Inventors: Kazuhiro NAMBA; Dai YAMAMOTO; Akira YAJIMA
- Web page: https://patentgrep.com/patent/US20190245173A1

## CPC

- H01M 50/30: Arrangements for facilitating escape of gases
- H01M 4/13: Electrodes for accumulators with non-aqueous electrolyte, e.g. for lithium-accumulators; Processes of manufacture thereof
- H01M 4/131: Electrodes based on mixed oxides or hydroxides, or on mixtures of oxides or hydroxides, e.g. LiCoOx
- H01M 4/364: {as mixtures}
- H01M 4/366: {as layered products}
- H01M 4/48: of inorganic oxides or hydroxides
- 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 4/502: {for non-aqueous cells (H01M4/505 takes precedence)}
- H01M 4/505: of mixed oxides or hydroxides containing manganese for inserting or intercalating light metals, e.g. LiMn2O4 or LiMn2OxFy
- H01M 4/62: Selection of inactive substances as ingredients for active masses, e.g. binders, fillers
- H01M 10/052: Li-accumulators
- H01M 10/0569: characterised by the solvents
- H01M 10/4235: {Safety or regulating additives or arrangements in electrodes, separators or electrolyte (H01M10/4242 takes precedence)}
- H01M 50/119: Metals
- H01M 50/3425: {in the form of rupturable membranes or weakened parts, e.g. pierced with the aid of a sharp member}
- H01M 50/103: prismatic or rectangular (H01M50/109, H01M50/11 take precedence)
- H01M 50/133: Thickness
- H01M 50/55: on the same side of the cell
- H01M 50/553: Terminals adapted for prismatic, pouch or rectangular cells
- H01M 50/566: by welding, soldering or brazing
- H01M 2004/021: {Physical characteristics, e.g. porosity, surface area}
- H01M 2004/027: {Negative electrodes}
- H01M 2300/004: Three solvents
- Y02E 60/10: Energy storage using 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

## Abstract

According to one embodiment, a nonaqueous electrolyte secondary battery is provided. The nonaqueous electrolyte secondary battery includes a container member, a negative electrode, a positive electrode, and a nonaqueous electrolyte. The container member is provided with a gas relief structure. The negative electrode includes a negative electrode mixture layer. The negative electrode mixture layer contains a titanium-containing oxide and Mn. Abundance ratios RTi, RMn, RA and RB obtained according to an X-ray photoelectron spectroscopy spectrum of the negative electrode mixture layer satisfy the following relational expressions: 0.01≤RMn/RTi≤0.2 (1); 3≤RA/RMn≤50 (2); and 0.5≤RA/RB≤5 (3).

## Claims

### Claim 1

A nonaqueous electrolyte secondary battery, comprising:
a container member comprising a gas relief structure;
a negative electrode accommodated in the container member and comprising a negative electrode mixture layer, the negative electrode mixture layer comprising a titanium-containing oxide and Mn;
a positive electrode accommodated in the container member; and
a nonaqueous electrolyte accommodated in the container member,
wherein an X-ray photoelectron spectroscopy spectrum obtained by X-ray photoelectron spectroscopy measurement of the negative electrode mixture layer includes: a peak belonging to Ti; a peak belonging to Mn; a peak belonging to C constituting a CO3 moiety; and a peak belonging to C constituting a CO2 moiety and/or a peak belonging to C constituting a CO moiety, and
wherein abundance ratios RTi, RMn, RA and RB obtained from the X-ray photoelectron spectroscopy spectrum satisfy the following relational expressions:
0.01≤RMn/RTi≤0.2 (1);
3≤RA/RMn≤50 (2); and
0.5≤RA/RA≤5 (3),
where RTi is an abundance ratio of Ti, RMn is an abundance ratio of Mn, and RA is an abundance ratio of C constituting the CO0 moiety, and
RB is a sum of an abundance ratio RC of C constituting the CO moiety and an abundance ratio RD of C constituting the CO2 moiety.

### Claim 2 (depends on 1)

The nonaqueous electrolyte secondary battery according to claim 1, wherein the titanium-containing oxide comprises lithium titanate having a spinel-type crystal structure.

### Claim 3 (depends on 1)

The nonaqueous electrolyte secondary battery according to claim 1, wherein the abundance ratios RTi, RMn, RA and RB fall within the following ranges:
0.02≤RMn/RTi≤0.1;
15≤RA/RMn≤30; and
1≤RA/RB≤2.

### Claim 4 (depends on 1)

The nonaqueous electrolyte secondary battery according to claim 1, wherein the nonaqueous electrolyte comprises propylene carbonate.

### Claim 5 (depends on 1)

The nonaqueous electrolyte secondary battery according to claim 1, wherein
the container member is a metallic container, and
the metallic container is provided with a gas relief vent as the gas relief structure.

### Claim 6 (depends on 1)

The nonaqueous electrolyte secondary battery according to claim 1, wherein
the container member includes a baggy container made of a laminate film, and
the baggy container comprises:
a heat-seal portion that is located at at least a part of a peripheral edge of the baggy container, and seals a space for accommodating the positive electrode, the negative electrode, and the nonaqueous electrolyte; and
a gas relief vent that is a part of the heat-sealed portion and has heat sealability lower than other parts.