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US5691005A
Expired / Lapsed
US
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Manufacturing method of a separator for a lithium secondary battery and an organic electrolyte lithium secondary battery using the same separator
Assignee: Panasonic Holdings Corp
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Filing: 1997-01-21
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Granted: 1997-11-25
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Expires: 2017-01-21
Abstract
Abstract An organic electrolyte lithium secondary battery wherein lithium is an active material. The battery comprises a negative electrode made of metallic lithium or a lithium alloy and a separator made of a microporous polyolefin separator matrix whose pores are filled with an ionic conductive gel electrolyte. The separator is in the form of a sheet with at least one face contacting the negative electrode having a gel electrolyte layer. The gel electrolyte is formed by ultraviolet irradiation of a solution having a major component being a mixture of an oligomer and a monomer added to an organic electrolyte. Using the separator in an organic electrolyte lithium secondary battery internal short circuiting of the battery due to dendridic lithium growing on a negative electrode during the charging cycle can be prevented and a longer cycle life achieved.
Inventors
- 👤 Kenichi Morigaki
- 👤 Noriko Kabuto
- 👤 Kazunori Haraguchi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 23:38
CPC Classifications
H; H01; H01M; H01M10/00; H01M10/05; H01M10/052; H01M10/056; H01M10/0564; H01M10/0565; H01M50/00; H01M50/40; H01M50/409; H01M50/411; H01M50/414; H01M50/417; H01M50/489; H01M50/491; H01M50/497; H01M2300/00; H01M2300/0085; Y; Y02; Y02E; Y02E60/00; Y02E60/10; Y10; Y10T; Y10T29/00; Y10T29/49; Y10T29/49002; Y10T29/49108; Y10T29/49115
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
133 words
A manufacturing method for producing a separator for a lithium secondary battery including: contacting a separator matrix having a microporous membrane comprising a polyolefin selected from the group consisting of polyethylene, polypropylene, and combinations thereof with a surface active agent for a time sufficient to perform a lyophilic treatment, impregnating a mixed solution into said separator matrix, wherein said mixed solution is produced by adding a mixture comprising an oligomer and a monomer with said mixed solution being capable of being polymerized into an organic electrolyte by ultra violet irradiation, and developing said separator matrix on a glass board having a surface coated by at least one fluoroplastic material by irradiating ultraviolet ray through said glass board to polymerize said mixed solution to produce a separator matrix comprising an ionic conductive gel electrolyte.
Claim 2
Dependent Claim
133 words
A manufacturing method for producing a separator for a lithium secondary battery including: contacting a separator matrix having a microporous membrane comprising a polyolefin selected from the group consisting of polyethylene, polypropylene, and combinations thereof with a surface active agent for a time sufficient to perform a lyophilic treatment, impregnating a mixed solution into said separator matrix, wherein said mixed solution is produced by adding a mixture comprising an oligomer and a monomer with said mixed solution being capable of being polymerized into an organic electrolyte by ultra violet irradiation, and developing said separator matrix on a glass board having a surface coated by at least one fluoroplastic material by irradiating ultraviolet ray through said glass board to polymerize said mixed solution to produce a separator matrix comprising an ionic conductive gel electrolyte.
Claim 3
Dependent Claim
131 words
A manufacturing method for producing a separator for a lithium secondary battery including: oxidizing a separator matrix having a microporous membrane comprising a polyolefin selected from the group consisting of polyethylene, polypropylene, and combinations thereof by plasma irradiation for a time sufficient to perform a lyophilic treatment, impregnating a mixed solution into said separator matrix, wherein said mixed solution is produced by adding a mixture comprising an oligomer and a monomer with said mixed solution being capable of being polymerized into an organic electrolyte by ultra violet irradiation, and developing said separator matrix on a glass board having a surface coated by at least one fluoroplastic material by irradiating ultraviolet ray through said glass board to polymerize said mixed solution to produce a separator matrix comprising an ionic conductive gel electrolyte.
Claim 4
Dependent Claim
131 words
A manufacturing method for producing a separator for a lithium secondary battery including: oxidizing a separator matrix having a microporous membrane comprising a polyolefin selected from the group consisting of polyethylene, polypropylene, and combinations thereof by plasma irradiation for a time sufficient to perform a lyophilic treatment, impregnating a mixed solution into said separator matrix, wherein said mixed solution is produced by adding a mixture comprising an oligomer and a monomer with said mixed solution being capable of being polymerized into an organic electrolyte by ultra violet irradiation, and developing said separator matrix on a glass board having a surface coated by at least one fluoroplastic material by irradiating ultraviolet ray through said glass board to polymerize said mixed solution to produce a separator matrix comprising an ionic conductive gel electrolyte.
Claim 5
Dependent Claim
98 words
A manufacturing method for producing a separator for a lithium secondary battery comprising the steps of: treating a microporous membrane comprising a polyolefin to produce a separator matrix having a surface which is lyophilic, impregnating said separator matrix with a solution comprising a resin capable of being polymerized by ultraviolet radiation and an organic electrolyte, and developing said impregnated separator matrix on a glass board having a surface coated with at least one fluoroplastic material by irradiating ultraviolet rays through said glass board to polymerize said solution to produce a separator matrix comprising an ionic conductive gel electrolyte.
Claim 6
Dependent Claim
98 words
A manufacturing method for producing a separator for a lithium secondary battery comprising the steps of: treating a microporous membrane comprising a polyolefin to produce a separator matrix having a surface which is lyophilic, impregnating said separator matrix with a solution comprising a resin capable of being polymerized by ultraviolet radiation and an organic electrolyte, and developing said impregnated separator matrix on a glass board having a surface coated with at least one fluoroplastic material by irradiating ultraviolet rays through said glass board to polymerize said solution to produce a separator matrix comprising an ionic conductive gel electrolyte.
Claim 7
Dependent Claim
22 words
A manufacturing method according to claim 3 wherein said polyolefin is selected from the group consisting of polyethylene, polypropylene, and combinations thereof.
Claim 8
Dependent Claim
21 words
A manufacturing method according to claim 3 wherein said treating step comprises contacting said microporous agent with a surface active agent.
Claim 9
Dependent Claim
19 words
A manufacturing method according to claim 3 wherein said treating step comprises oxidizing said microporous membrane by plasma irradiation.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 2000-11-24 | 2001-05-26 | 2001-11-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2004-11-24 | 2005-05-26 | 2005-11-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2008-11-24 | 2009-05-26 | 2009-11-25 | $7700.00 | Window Closed / Lapsed |