US5085952A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Solid state cell electrolyte
Assignee: Dowty Electronic Components Ltd
•
Filing: 1991-01-15
•
Granted: 1992-02-04
•
Expires: 2011-01-15
Abstract
Abstract A solid polymer electrolyte for a solid state electrochemical cell comprises a complex of a solid polymer such as poly(ethene oxide) and an alkali metal salt such as LiCLO 4 , which polymer is capable of forming donor: acceptor type bonds with alkali metal ions and is capable of conducting alkali metal ions, the complex being associated with a mixture of more than one 1,3-dioxolane-2-ones, for example ethylene carbonate and propylene carbonate, such that the electrolyte possesses satisfactory ambient temperature ionic conductivity (e.g. 10 -3 to 10 -4 ohm -1 cm -1 ) and a cell including the electrolyte substantially maintains its discharge capacity at ambient temperature after repeated charge/discharge cycling.
Inventors
- 👤 John M. North
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 17:05
CPC Classifications
H; H01; H01M; H01M10/00; H01M10/05; H01M10/052; H01M10/056; H01M10/0564; H01M10/0565; H01M6/00; H01M6/14; H01M6/16; H01M6/162; H01M6/164; Y; Y02; Y02E; Y02E60/00; Y02E60/10
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
70 words
A solid state electrochemical cell comprising a lithium-containing anode, a cathode, and a solid polymer electrolyte comprising a complex of poly(ethene oxide) and a lithium salt which is capable of conducting lithium ions, wherein said complex of poly(ethene oxide) is associated with a mixture comprising ethylene carbonate and propylene carbonate and wherein the cell can deliver 60 percent of its initial cathode utilization after discharging and charging for 85 cycles.
Claim 2
Dependent Claim
70 words
A solid state electrochemical cell comprising a lithium-containing anode, a cathode, and a solid polymer electrolyte comprising a complex of poly(ethene oxide) and a lithium salt which is capable of conducting lithium ions, wherein said complex of poly(ethene oxide) is associated with a mixture comprising ethylene carbonate and propylene carbonate and wherein the cell can deliver 60 percent of its initial cathode utilization after discharging and charging for 85 cycles.
Claim 3
Dependent Claim
70 words
The solid state electrochemical cell of claim 1 wherein the molar ratios of the constituents of the solid polymer electrolyte are represented by the general formula (I) below: PEO.sub.1 :[xEC : yPC].sub.b n : LiX (I) where PEO represents poly(ethene oxide) EC represents ethylene carbonate PC represents propylene carbonate and each of a, b, x, y and n is finite and represents a molar quantity, and X is an anion.
Claim 4
Dependent Claim
45 words
The solid electrochemical cell of claim 1 wherein the molar ratios of the constituents therein are represented by the formula (II) below: PEO : [2EC :2PC]20: LiClO.sub.4 (II) where PEO, EC and PC are defined as in claim 9 and the numbers represent molar quantities.
Claim 5
Dependent Claim
33 words
The solid state electrochemical cell of claim 1 wherein the polymer electrolyte has an ionic conductivity of 10 -3 to 10 -4 ohms -1 cm -1 at temperatures between 15° and 30° C.
Claim 6
Dependent Claim
21 words
A solid state electrochemical cell of claim 1 wherein the ratio of ethylene carbonate to propylene carbonate is 3:1 by weight.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1995-02-03 | 1995-08-05 | 1996-02-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1999-02-03 | 1999-08-05 | 2000-02-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2003-02-03 | 2003-08-05 | 2004-02-04 | $7700.00 | Window Closed / Lapsed |