Negative electrode for nonaqueous electrolyte secondary battery and nonaqueous electrolyte secondary battery
US-2020119336-A1 · Apr 16, 2020 · US
Negative electrode for nonaqueous electrolyte secondary battery, and nonaqueous electrolyte secondary battery
US11728472B2 · US · B2
| Field | Value |
|---|---|
| Publication number | US-11728472-B2 |
| Application number | US-202017123963-A |
| Country | US |
| Kind code | B2 |
| Filing date | Dec 16, 2020 |
| Priority date | Dec 23, 2019 |
| Publication date | Aug 15, 2023 |
| Grant date | Aug 15, 2023 |
How to read this patent
A practical reading order for non-experts. Skip the full description unless you need deep technical detail.
- Title
What the patent document calls the invention.
- Abstract
A short plain-language summary of the technical disclosure.
- Assignees and inventors
Who owns or filed the patent and who is credited as inventor.
- Key dates
Filing, priority, publication, and grant dates set the timeline.
- First independent claim
The legal scope of protection — read this for what is actually claimed.
- CPC / IPC classifications
Technology tags used to group this patent with similar filings.
- Citations and related patents
Prior art links and similar publications in this corpus.
Abstract
Official abstract text for this publication.
A negative electrode for a nonaqueous electrolyte secondary battery, which is an example of embodiments, comprises a negative electrode core body and a negative electrode mixture layer provided on the surface of the negative electrode core body. The negative electrode mixture layer includes graphite and fibrous carbon. The BET specific surface area of the graphite included in the first region is smaller than the BET specific surface area of the graphite included in the second region. In addition, the average length of the fibrous carbon included in the first region is longer than the average length of the fibrous carbon included in the second region.
First claim
Opening claim text (preview).
The invention claimed is: 1. A negative electrode for a nonaqueous electrolyte secondary battery, comprising: a negative electrode core sheet; and a negative electrode mixture layer provided on a surface of the negative electrode core sheet, wherein the negative electrode mixture layer includes graphite and fibrous carbon, and wherein, when a range of 40% of a thickness of the mixture layer from a surface of the negative electrode mixture layer on a side opposite to the negative electrode core sheet is defined as a first region and a range of 40% of a thickness of the mixture layer from an interface between the negative electrode mixture layer and the negative electrode core sheet is defined as a second region, a BET specific surface area of the graphite included in the first region is smaller than a BET specific surface area of the graphite included in the second region, and an average length of the fibrous carbon included in the first region is longer than an average length of the fibrous carbon included in the second region, wherein the average length of the fibrous carbon included in the first region is 5 μm or more and less than 50 μm, and the average length of the fibrous carbon included in the second region is 0.05 μm or more and 4.5 μm or less. 2. The negative electrode for a nonaqueous electrolyte secondary battery according to claim 1 , wherein the average length of the fibrous carbon included in the first region is 7.5 μm or more and 45 μm or less, and the average length of the fibrous carbon included in the second region is 0.1 μm or more and 4.0 μm or less. 3. The negative electrode for a nonaqueous electrolyte secondary battery according to claim 1 , wherein the BET specific surface area of the graphite included in the first region is 0.75 m 2 /g or more and 1.9 m 2 /g or less, and the BET specific surface area of the graphite included in the second region is 2.5 m 2 /g or more and 4.5 m 2 /g or less. 4. The negative electrode for a nonaqueous electrolyte secondary battery according to claim 1 , wherein the negative electrode mixture layer further includes a Si based active material containing Si. 5. A nonaqueous electrolyte secondary battery, comprising: the negative electrode according to claim 1 ; a positive electrode; and a nonaqueous electrolyte.
Assignees
Inventors
Classifications
- H01M4/364Primary
as mixtures · CPC title
- H01M4/133Primary
Electrodes based on carbonaceous material, e.g. graphite-intercalation compounds or CFx · CPC title
Electrodes based on metals, Si or alloys · CPC title
as layered products · CPC title
Rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodes; Lithium-ion batteries · CPC title
Patent family
Related publications grouped by family.
External sources
Frequently asked questions
Answers are generated from the same data shown on this page.
- What does patent US11728472B2 cover?
- A negative electrode for a nonaqueous electrolyte secondary battery, which is an example of embodiments, comprises a negative electrode core body and a negative electrode mixture layer provided on the surface of the negative electrode core body. The negative electrode mixture layer includes graphite and fibrous carbon. The BET specific surface area of the graphite included in the first region i…
- Who is the assignee on this patent?
- Panasonic Corp, Toyota Motor Co Ltd, Panasonic Holdings Corp
- What technology area does this patent fall under?
- Primary CPC classification H01M4/364. Mapped technology areas include Electricity.
- When was this patent published?
- Publication date Tue Aug 15 2023 00:00:00 GMT+0000 (Coordinated Universal Time) (B2). Legal status and post-grant events are not shown on this page.
- What related patents are in patentsdb?
- We list 3 related publications on this page (citations in our corpus or others sharing the same primary CPC).