US4840858A
Expired / Lapsed
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Secondary cell
Assignee: Sanyo Electric Co Ltd
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Filing: 1988-06-13
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Granted: 1989-06-20
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Expires: 2008-06-13
Abstract
Abstract A rechargeable secondary cell having the following as main components: a positive electrode formed of a conductive polymer, a negative electrode, a separator disposed between the positive and negative electrodes, an electrolyte comprising a mixed solvent of γ-butyrolactone and a cyclic carbonic ester compound or ethylene carbonate, each being expressed by the following chemical formula. ##STR1## (where R 1 is a lower alkyl group having 1-3 carbon atoms and R 2 is a hydrogen atom or a methyl group, R 2 being a hydrogen atom, and R 1 being a group other than the methyl group.)
Inventors
- 👤 Nobuhiro Furukawa
- 👤 Koji Nishio
- 👤 Noriyuki Yoshinaga
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 21:17
CPC Classifications
H; H01; H01M; H01M10/00; H01M10/05; H01M10/056; H01M10/0564; H01M10/0566; H01M10/0569; Y; Y02; Y02E; Y02E60/00; Y02E60/10
Claims Analysis
Total Claims: 17
Claim 1
Independent Claim
89 words
A rechargeable secondary cell comprising; a positive electrode formed of a conductive polymer; a negative electrode; a separator disposed between the positive electrode and the negative electrode; and an electrolyte including a mixed solvent of γ-butyrolactone and a cyclic carbonic ester compound expressed by the following chemical formulas. ##STR10## (where R 1 is a lower alkyl group having 1-3 carbon atoms and R 2 is a hydrogen atom or a methyl group, R 2 being a hydrogen atom, and R 1 being a group other than the methyl group.)
Claim 2
Dependent Claim
89 words
A rechargeable secondary cell comprising; a positive electrode formed of a conductive polymer; a negative electrode; a separator disposed between the positive electrode and the negative electrode; and an electrolyte including a mixed solvent of γ-butyrolactone and a cyclic carbonic ester compound expressed by the following chemical formulas. ##STR10## (where R 1 is a lower alkyl group having 1-3 carbon atoms and R 2 is a hydrogen atom or a methyl group, R 2 being a hydrogen atom, and R 1 being a group other than the methyl group.)
Claim 3
Dependent Claim
40 words
A cell as claimed in claim 1, wherein the compound of cyclic carbonic ester compound is selected from a group consisting of 1,2-butylene carbonate, 2,3-butylene carbonate, 1,2-pentene carbonate and 2,3-pentene carbonate, each being expressed by the following chemical formula. ##STR11##
Claim 4
Dependent Claim
21 words
A cell as claimed in claim 1, wherein the conductive polymer is selected from a group consisting of polypyrrole and polyaniline.
Claim 5
Dependent Claim
31 words
A cell as claimed in claim 1, wherein the electrolyte comprises a mixed solution prepared by dissolving lithium perchlorate into a mixed solvent of γ-butyrolactone and a cyclic carbonic ester compound.
Claim 6
Dependent Claim
23 words
A cell as claimed in claim 1, wherein the cyclic carbonic ester compound and γ-butyrolactone are mixed in a volume ratio of 90:10-20:80.
Claim 7
Dependent Claim
23 words
A cell as claimed in claim 1, wherein the cyclic carbonic ester compound and γ-butyrolactone are mixed in a volume raio of 70:30-40:60.
Claim 8
Dependent Claim
15 words
A cell as claimed in claim 1, wherein the negative electrode comprises a conductive polymer.
Claim 9
Dependent Claim
15 words
A cell as claimed in claim 1, wherein the negative electrode comprises a metallic lithium.
Claim 10
Dependent Claim
35 words
A rechargeable secondary cell comprising: a positive electrode formed of a conductive polymer; a negative electrode; and an electrolyte including a mixed solvent of γ-butyrolactone and ethylene carbonate expressed by the following chemical formulas. ##STR12##
Claim 11
Dependent Claim
35 words
A rechargeable secondary cell comprising: a positive electrode formed of a conductive polymer; a negative electrode; and an electrolyte including a mixed solvent of γ-butyrolactone and ethylene carbonate expressed by the following chemical formulas. ##STR12##
Claim 12
Dependent Claim
21 words
A cell as claim in claim 9, wherein the conductive polymer is selected from a group consisting of polypyrrole and polyaniline.
Claim 13
Dependent Claim
28 words
A cell as claim in claim 9, wherein the electrolyte comprises a mixed solution prepared by dissolving lithium perchlorate into a mixed solvent of γ-butyrolactone and ethylene carbonate.
Claim 14
Dependent Claim
21 words
A cell as claimed in claim 9, wherein the γ-butyrolactone and ethylene carbonate are mixed in a volume ratio of 90:10-20:80.
Claim 15
Dependent Claim
21 words
A cell as claimed in claim 9, wherein the γ-butyrolactone and ethylene carbonate are mixed in a volume ratio of 70:30-40:60.
Claim 16
Dependent Claim
22 words
A cell as claimed in claim 9, wherein the negative electrode is pressed upon a bottom inside surface of a negative collector.
Claim 17
Dependent Claim
22 words
A cell as claimed in claim 9, wherein the positive electrode is pressed upon a bottom inside surface of a positive collector.
References Cited (Backward Citations)
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| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
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| 3.5 Years (Year 4) | 1992-06-19 | 1992-12-19 | 1993-06-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-06-19 | 1996-12-19 | 1997-06-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-06-19 | 2000-12-19 | 2001-06-20 | $7700.00 | Window Closed / Lapsed |