Negative electrode for nonaqueous electrolyte secondary battery and nonaqueous electrolyte secondary battery
US-2020119336-A1 · Apr 16, 2020 · US
Nonaqueous electrolyte secondary battery
US2020403221A1 · US · A1
| Field | Value |
|---|---|
| Publication number | US-2020403221-A1 |
| Application number | US-201916975829-A |
| Country | US |
| Kind code | A1 |
| Filing date | Feb 13, 2019 |
| Priority date | Feb 28, 2018 |
| Publication date | Dec 24, 2020 |
| Grant date | — |
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Abstract
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In a nonaqueous electrolyte secondary battery, a positive electrode active material contains a titanium lithium complex oxide that has a lattice shrinkage in charged state of 98.5% or less. A negative electrode mix layer contains a polyacrylic acid or a salt thereof and includes a first layer and a second layer disposed successively from a negative electrode collector. Each of the first layer and the second layer contains a carbon-based negative electrode active material, and the ratio (B/A) of the D-band/G-band ratio (B) of the Raman spectrum of the second layer to the D-band/G-band ratio (A) of the Raman spectrum of the first layer is 2 to 10. The concentration of the polyacrylic acid or a salt thereof in the first layer is higher than the concentration of the polyacrylic acid or a salt thereof in the second layer.
First claim
Opening claim text (preview).
1 . A nonaqueous electrolyte secondary battery comprising a positive electrode containing a positive electrode active material, a negative electrode including a negative electrode mix layer disposed on a negative electrode collector, and a nonaqueous electrolyte, wherein the positive electrode active material contains a titanium lithium complex oxide that has a lattice shrinkage in charged state of 98.5% or less, the negative electrode mix layer contains a polyacrylic acid or a salt thereof and includes a first layer and a second layer disposed successively from the negative electrode collector, each of the first layer and the second layer contains a carbon-based negative electrode active material, the ratio (B/A) of the D-band/G-band ratio (B) of the Raman spectrum of the second layer to the D-band/G-band ratio (A) of the Raman spectrum of the first layer is 2 to 10, and the concentration of the polyacrylic acid or a salt thereof in the first layer is higher than the concentration of the polyacrylic acid or a salt thereof in the second layer. 2 . The nonaqueous electrolyte secondary battery according to claim 1 , wherein the thickness of the second layer is 20% to 70% of the thickness of the negative electrode mix layer. 3 . The nonaqueous electrolyte secondary battery according to claim 1 , wherein the second layer contains substantially no polyacrylic acid nor salt thereof. 4 . The nonaqueous electrolyte secondary battery according to claim 1 , wherein the first layer contains a silicon compound.
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Classifications
Manufacturing or production processes characterised by the final manufactured product · CPC title
being polymers · CPC title
for inserting or intercalating light metals · CPC title
Positive electrodes · CPC title
for non-aqueous cells (H01M4/485 takes precedence) · CPC title
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- What does patent US2020403221A1 cover?
- In a nonaqueous electrolyte secondary battery, a positive electrode active material contains a titanium lithium complex oxide that has a lattice shrinkage in charged state of 98.5% or less. A negative electrode mix layer contains a polyacrylic acid or a salt thereof and includes a first layer and a second layer disposed successively from a negative electrode collector. Each of the first layer a…
- Who is the assignee on this patent?
- Panasonic Ip Man Co Ltd
- What technology area does this patent fall under?
- Primary CPC classification H01M10/0525. Mapped technology areas include Electricity.
- When was this patent published?
- Publication date Thu Dec 24 2020 00:00:00 GMT+0000 (Coordinated Universal Time) (A1). Legal status and post-grant events are not shown on this page.
- What related patents are in patentsdb?
- We list 6 related publications on this page (citations in our corpus or others sharing the same primary CPC).