Separator for Electrochemical Element, Process for Producing Separator and Electrochemical Element Using Separator
US-2015064573-A1 · Mar 5, 2015 · US
Separator for electrochemical elements and electrochemical element including separator for electrochemical elements
US10818898B2 · US · B2
| Field | Value |
|---|---|
| Publication number | US-10818898-B2 |
| Application number | US-201716098152-A |
| Country | US |
| Kind code | B2 |
| Filing date | May 1, 2017 |
| Priority date | May 9, 2016 |
| Publication date | Oct 27, 2020 |
| Grant date | Oct 27, 2020 |
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- Title
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Abstract
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A separator for electrochemical elements includes beaten solvent-spun cellulose fibers and rayon fibers having a fiber diameter of 9.5 μm or less. More preferably, the separator for electrochemical elements has a content of the rayon fibers relative to all fibers of 10 to 25% by mass, and can be applied to electrochemical elements such as electric double layer capacitors, hybrid capacitors, redox capacitors, and lithium secondary batteries. The separator can provide low internal short circuit failure rates and high surface strength.
First claim
Opening claim text (preview).
The invention claimed is: 1. A separator for electrochemical elements comprising beaten solvent-spun cellulose fibers and rayon fibers having a fiber diameter of 9.5 μm or less, wherein: the beaten solvent-spun cellulose fibers have a modified freeness of 75 ml or more and 220 ml or less, and the rayon fibers have a fiber length of 1 mm or more and 6 mm or less. 2. The separator for electrochemical elements according to claim 1 , wherein the content of the rayon fibers relative to all fibers is 10% by mass or more and 25% by mass or less. 3. The separator for electrochemical elements according to claim 1 , wherein the rayon fibers have a fiber diameter of 5.0 μm or more and 9.5 μm or less. 4. The separator for electrochemical elements according to claim 1 , wherein the rayon fibers have a fiber diameter of 5.0 μm or more and 8.5 μm or less. 5. An electrochemical element comprising the separator for electrochemical elements according to claim 1 . 6. The separator for electrochemical elements according to claim 1 , wherein the content of the rayon fibers relative to all fibers is 10% by mass or more and 20% by mass or less. 7. The separator for electrochemical elements according to claim 1 , wherein the content of the rayon fibers relative to all fibers is 15% by mass or more and 20% by mass or less. 8. The separator for electrochemical elements according to claim 1 , wherein the beaten solvent-spun cellulose fibers have a modified freeness of 90 ml or more and 175 ml or less. 9. The separator for electrochemical elements according to claim 1 , wherein the beaten solvent-spun cellulose fibers have a modified freeness of 90 ml or more and 120 ml or less. 10. The separator for electrochemical elements according to claim 1 , wherein the separator has a basis weight of 7 g/m 2 or more and 24 g/m 2 or less. 11. The separator for electrochemical elements according to claim 1 , wherein the separator has a basis weight of 12 g/m 2 or more and 18 g/m 2 or less. 12. The separator for electrochemical elements according to claim 1 , wherein the separator has a thickness of 10 μm or more and 50 μm or less. 13. The separator for electrochemical elements according to claim 1 , wherein the separator has a thickness of 25 μm or more and 40 μm or less. 14. The separator for electrochemical elements according to claim 1 , wherein the beaten solvent-spun cellulose fibers has a length-weighted average fiber length of 0.2 mm or more and 3.0 mm or less. 15. The separator for electrochemical elements according to claim 1 , wherein the beaten solvent-spun cellulose fibers has a length-weighted average fiber length of 0.2 mm or more and 1.6 mm or less. 16. The separator for electrochemical elements according to claim 1 , wherein the rayon fibers have a fiber length of 3 mm or more and 4 mm or less.
Assignees
Inventors
Classifications
Tensile strength · CPC title
Separators, membranes or diaphragms characterised by the material · CPC title
Natural cotton, cellulose or wood · CPC title
- H01M50/44Primary
Fibrous material · CPC title
Other fibrous materials fabric · CPC title
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- What does patent US10818898B2 cover?
- A separator for electrochemical elements includes beaten solvent-spun cellulose fibers and rayon fibers having a fiber diameter of 9.5 μm or less. More preferably, the separator for electrochemical elements has a content of the rayon fibers relative to all fibers of 10 to 25% by mass, and can be applied to electrochemical elements such as electric double layer capacitors, hybrid capacitors, red…
- Who is the assignee on this patent?
- Mitsubishi Paper Mills Ltd
- What technology area does this patent fall under?
- Primary CPC classification H01M50/44. Mapped technology areas include Electricity.
- When was this patent published?
- Publication date Tue Oct 27 2020 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 2 related publications on this page (citations in our corpus or others sharing the same primary CPC).