Non-aqueous electrolyte rechargeable battery

Patent metadata

Field	Value
Publication number	US-12244009-B2
Application number	US-202017430083-A
Country	US
Kind code	B2
Filing date	Feb 21, 2020
Priority date	Feb 28, 2019
Publication date	Mar 4, 2025
Grant date	Mar 4, 2025

Abstract

The purpose of the present disclosure is to provide a non-aqueous electrolyte rechargeable battery that serves to improve the thermal stability of the lithium composite oxide while keeping degradation in the low-temperature characteristics of the battery under control. A non-aqueous electrolyte rechargeable battery involving one aspect of the present disclosure includes a cathode, an anode, and a non-aqueous electrolyte. The cathode includes a cathode current collector and a cathode laminate disposed on the cathode current collector. The cathode laminate includes a lithium composite oxide ( 30 ) composed of secondary particles ( 34 ) formed of aggregated primary particles ( 32 ). Letting the average particle diameter of the primary particles ( 32 ) be d and the standard deviation in the particle-size distribution be σ, among the secondary particles ( 34 ) primary particles ( 32 a ) having a particle diameter greater than d+6σ are present.

First claim

The invention claimed is:

1. An non-aqueous electrolyte secondary battery including a positive electrode, a negative electrode, and a non-aqueous electrolyte, the positive electrode including a positive electrode current collector and a positive electrode mixture layer located on the positive electrode current collector,
wherein the positive electrode mixture layer includes a lithium complex oxide in a form of secondary particles, each of the secondary particles being agglomerated primary particles, and
the secondary particles include a secondary particle in which a coarse primary particle having a particle size larger than d+6σ is present, wherein d represents an average value of particle sizes of the primary particles and σ represents a standard deviation of a particle size distribution of the primary particles, wherein particle size is defined as a length of the primary particle in the major axis direction.

2. The non-aqueous electrolyte secondary battery according to claim 1 , wherein the lithium complex oxide includes a lithium/nickel complex oxide represented by Li x Ni y M (1-y) O 2 , wherein 0.95≤x≤1.10, 0.65≤y≤1.0, and M is at least one element selected from the group consisting of Co, Mn, Al, Mg, Ti, Sr, Zr, Y, Mo, and W.

3. The non-aqueous electrolyte secondary battery according to claim 1 , wherein the average value of the particle sizes of the primary particles, d, is 0.3 μm to 2.0 μm.

4. The non-aqueous electrolyte secondary battery according to claim 1 , wherein the particle size of the coarse primary particle is larger than d+10.

5. The non-aqueous electrolyte secondary battery according to claim 1 , wherein the particle size of the coarse primary particle is larger than d+14σ.

6. The non-aqueous electrolyte secondary battery according to claim 1 , wherein a number of the coarse primary particles present in the secondary particle is 1 to 3.

7. The non-aqueous electrolyte secondary battery according to claim 1 , wherein each of the secondary particles is composed of 300 to 1000 primary particles.

8. The non-aqueous electrolyte secondary battery according to claim 1 , wherein an average particle size of the secondary particles is within the range from 3 μm to 20 μm.

Assignees

• Panasonic Ip Man Co Ltd

Inventors

• Kawamoto Yasunobu
• Kinoshita Masahiro

Classifications

• H01M2004/028

  Positive electrodes · CPC title

• H01M2004/021

  Physical characteristics, e.g. porosity, surface area · CPC title

• H01M4/505

  of mixed oxides or hydroxides containing manganese for inserting or intercalating light metals, e.g. LiMn2O4 or LiMn2OxFy · CPC title

• C01P2004/50

  Agglomerated particles · CPC title

• C01P2004/61

  Micrometer sized, i.e. from 1-100 micrometer · CPC title