# US 2019/0245200 A1 · Non-aqueous electrolyte secondary battery

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- Number: US 2019/0245200 A1
- Document ID: US20190245200A1
- Status: Published application
- Kind: A1
- Application number: 16/343,227
- Filed: 2017-10-19
- Published: 2019-08-08
- Earliest claimed: 2016-10-31
- Assignees: Panasonic Intellectual Property Management Co., Ltd.
- Applicants: Panasonic Intellectual Property Management Co., Ltd.
- Inventors: Yasunori Baba; Takashi Ko; Fumiharu Niina; Katsunori Yanagida
- Web page: https://patentgrep.com/patent/US20190245200A1

## CPC

- H01M 4/364: {as mixtures}
- H01M 4/131: Electrodes based on mixed oxides or hydroxides, or on mixtures of oxides or hydroxides, e.g. LiCoOx
- H01M 4/36: Selection of substances as active materials, active masses, active liquids
- 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 4/505: 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 10/0525: Rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodes; Lithium-ion batteries
- H01M 2004/021: {Physical characteristics, e.g. porosity, surface area}
- H01M 2004/028: {Positive electrodes}
- 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

The present invention relates to a non-aqueous electrolyte secondary cell comprising: a positive electrode having a positive electrode mixture layer that contains a first positive-electrode active material and a second positive-electrode active material; a negative electrode containing a lithium-titanium composite oxide as a negative-electrode active material; and a non-aqueous electrolyte. The volume per mass of pores in the first positive-electrode active material having a pore diameter of 100 nm or less is four or more times the volume per mass of pores in the second positive-electrode active material having a pore diameter of 100 nm or less. The content of the first positive-electrode active material is 30 mass % or less with respect to the total amount of the first positive-electrode active material and the second positive-electrode active material.

## Claims

### Claim 1

A non-aqueous electrolyte secondary battery comprising:
a positive electrode having a positive electrode mixture layer containing a first positive electrode active material and a second positive electrode active material;
a negative electrode containing a lithium-titanium composite oxide as a negative electrode active material; and
a non-aqueous electrolyte, wherein
the first positive electrode active material has a pore volume, of pores each having a pore diameter of 100 nm or less, per mass of 8 mm3/g or more,
the second positive electrode active material has a pore volume, of pores each having a pore diameter of 100 nm or less, per mass of 5 mm3/g or less,
the pore volume, of pores each having a pore diameter of 100 nm or less, per mass of the first positive electrode active material is 4 or more times the pore volume, of pores each having a pore diameter of 100 nm or less, per mass of the second positive electrode active material, and
the content of the first positive electrode active material is 30 mass % or less based on the total amount of the first positive electrode active material and the second positive electrode active material.

### Claim 2 (depends on 1)

The non-aqueous electrolyte secondary battery according to claim 1, wherein the content of the first positive electrode active material contained in a region ranging from the surface to the center in the thickness direction of the positive electrode mixture layer is 60 mass % or more based on the total amount of the first positive electrode active material contained in the positive electrode mixture layer.

### Claim 3 (depends on 1)

The non-aqueous electrolyte secondary battery according to claim 1, wherein both the first positive electrode active material and the second positive electrode active material are lamellar lithium transition metal oxide represented by a general formula (1): Li1+xMaO2+b, wherein x, a, and b meet conditions: a=1, −0.2≤x≤0.4, and −0.1≤b≤0.4, and M represents a metal element including at least one element selected from the group consisting of Ni, Co, Mn, and Al.