Positive electrode active material and preparation method thereof, positive electrode plate, secondary battery, battery module, battery pack, and electric apparatus
US-2024429384-A1 · Dec 26, 2024 · US
Lithium-ion secondary battery
US8945768B2 · US · B2
| Field | Value |
|---|---|
| Publication number | US-8945768-B2 |
| Application number | US-201113807453-A |
| Country | US |
| Kind code | B2 |
| Filing date | May 6, 2011 |
| Priority date | May 6, 2011 |
| Publication date | Feb 3, 2015 |
| Grant date | Feb 3, 2015 |
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Abstract
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A lithium-ion secondary battery 100 includes a positive electrode current collector 221 and a porous positive electrode active material layer 223 retained by the positive electrode current collector 221 . The positive electrode active material layer 223 contains, for example, positive electrode active material particles 610 , an electrically conductive material 620 , and a binder 630 . In this lithium-ion secondary battery 100 , the positive electrode active material particles 610 have a shell portion 612 constituted by a lithium transition metal oxide, a hollow portion 614 formed inside the shell portion 612 , and a through hole 616 penetrating the shell portion 612 . In the lithium-ion secondary battery 100 , in the positive electrode active material layer 223 on average, the hollow portion 614 accounts for 23% or higher of an apparent sectional area of the positive electrode active material particles 610 . In addition, a thickness of the shell portion 612 in the positive electrode active material layer 223 on average is 2.2 μm or less.
First claim
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The invention claimed is: 1. A lithium-ion secondary battery comprising: a current collector; and a porous positive electrode active material layer which is retained by the current collector and which contains positive electrode active material particles, an electrically conductive material, and a binder, wherein the positive electrode active material particles have: a shell portion constituted by a lithium transition metal oxide; a hollow portion formed inside the shell p…
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- What does patent US8945768B2 cover?
- A lithium-ion secondary battery 100 includes a positive electrode current collector 221 and a porous positive electrode active material layer 223 retained by the positive electrode current collector 221 . The positive electrode active material layer 223 contains, for example, positive electrode active material particles 610 , an electrically conductive material 620 , and a binder 63…
- Who is the assignee on this patent?
- Nagai Hiroki, Toyota Motor Co Ltd
- What technology area does this patent fall under?
- Primary CPC classification H01M4/505. Mapped technology areas include Electricity.
- When was this patent published?
- Publication date Tue Feb 03 2015 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 8 related publications on this page (citations in our corpus or others sharing the same primary CPC).