Electrode body of non-aqueous electrolyte rechargeable battery and non-aqueous electrolyte rechargeable battery

Patent metadata

Field	Value
Publication number	US-2024079553-A1
Application number	US-202318240243-A
Country	US
Kind code	A1
Filing date	Aug 30, 2023
Priority date	Sep 1, 2022
Publication date	Mar 7, 2024
Grant date	—

Abstract

An electrode body of a non-aqueous electrolyte rechargeable battery includes a positive electrode, a negative electrode, and a separator. The negative electrode includes a current collector and an active material layer. The active material layer includes active material particles. The active material particles have a volume distribution including a first peak corresponding to a first particle size and a second peak corresponding to a second particle size smaller than the first particle size. The first particle size is in a range of 7.0 μm to 9.0 μm. The second particle size is in a range of 0.8 μm to 1.0 μm. The separator has a surface roughness of 1.54 μm or greater. A peak ratio of a volume of the active material particles of the second peak to a volume of the active material particles of the first peak is in a range of 0.42 to 0.71.

First claim

What is claimed is:

1 . An electrode body of a non-aqueous electrolyte rechargeable battery, the electrode body comprising:
a positive electrode; a negative electrode; and a separator arranged between the positive electrode and the negative electrode, wherein the negative electrode includes a current collector and an active material layer applied to at least one surface of the current collector, the active material layer includes active material particles of different particle sizes formed from a carbon material, the active material particles have a volume distribution with respect to particle size, the volume distribution including a first peak corresponding to a first particle size and a second peak corresponding to a second particle size that is smaller than the first particle size, the first particle size is in a range of 7.0 μm to 9.0 μm, the second particle size is in a range of 0.8 μm to 1.0 μm, the separator has a surface roughness of 1.54 μm or greater, and a peak ratio that is a ratio of a volume of the active material particles of the second peak to a volume of the active material particles of the first peak is in a range of 0.42 to 0.71.

2 . The electrode body of a non-aqueous electrolyte rechargeable battery according to claim 1 , wherein
the surface roughness of the separator is 2.29 μm or greater, and the peak ratio is in a range of 0.42 to 0.61.

3 . A non-aqueous electrolyte rechargeable battery, comprising:
the electrode body according to claim 1 ; a non-aqueous electrolyte; and a battery case accommodating the electrode body and the non-aqueous electrolyte.

Assignees

• Primearth Ev Energy Co Ltd
• Toyota Motor Co Ltd
• Prime Planet Energy & Solutions Inc

Inventors

• Kudo Yoshinori
• Wakamatsu Naoki

Classifications

• H01M2004/027

  Negative electrodes · CPC title

• H01M50/489

  Separators, membranes, diaphragms or spacing elements inside the cells, characterised by their physical properties, e.g. swelling degree, hydrophilicity or shut down properties · CPC title

• H01M4/133 Primary

  Electrodes based on carbonaceous material, e.g. graphite-intercalation compounds or CFx · CPC title

• H01M10/0525

  Rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodes; Lithium-ion batteries · CPC title

• H01M10/058 Primary

  Construction or manufacture · CPC title