 Halogen hydrate storage device for mobile zinc-chloride battery systems |
| What is claimed is: 1. In a metal halogen battery system, including at least one cell having a ... |
|
| Method for producing solar cell-grade silicon from rice hulls |
| OF THE INVENTION The present invention relates to the production of high purity silicon and in ... |
|
| Vapor desposition method |
| I claim: 1. In a method for effecting vapor deposition of a material on an object, the steps of: A. ... |
|
| Method for producing coatings of low gloss |
| We claim: 1. A method of producing a hard, mar resistant and abrasion resistant, cured coating of ... |
|
| Process for coating substrates |
| OF THE INVENTION Any substrate which has been or could have been coated with a composition ... |
|
| Solar cooling system for an automobile |
| My invention relates to a unique and novel concept of operating a cooling system for an automobile ... |
|
| Rubber mixtures having improved surface tack |
| We claim: 1. Rubber mixtures containing from 1 to 20 parts of a 2-oxotetrahydropyrimidine for every ... |
|
| Water activatable, lead-acid storage battery and method for manufacturing same |
| I claim as my invention: 1. A method of manufacturing a lead-acid storage battery including a ... |
|
| Manually operated electrical connector for printed circuit boards |
| The connector of this invention may be used with a printed circuit board that has at least twice ... |
|
| Magnetic recording medium |
| The object of the present invention is to overcome the above and is attained by employing plate-... |
|
|
Lithium battery with secondary battery separator
| Details |
Inventors: Ma, Jackson C.; Megahed, El-Sayed; Stachoviak, Timothy J.; Craanen, Shirley A.; Schneider, Daniel A.; Nestler, Joseph P.;
Assignee:
Primary Examiner: Maples; John S.
Assistant Examiner:
Attorney, Agent or Firm: Michael Best & Friedrich LLP, Frenchick, Esq.; Grady J., Yager, Esq.; Charlene L.
A secondary battery separator comprises a fibrous core coated with a polymer having improved electrode adhesion properties in unitary laminated construction. Vacuum removal of plasticizer without solvent extraction prevents brittleness and results in microporosity in a thin layer of enhanced ion conductivity. |
|
DETAILED DESCRIPTION In accordance with the present invention, a separator suitable for use in a secondary lithium battery is made of a pre-formed porous non-woven mat comprising a first homopolymer of polypropylene, polyethylene, or polyvinylalcohol, coated with a second homopolymer.
Porosity of the homopolymeric coating, which may preferably be polyvinylidene difluoride, is obtained by first mixing the homopolymer with a low boiling solvent selected from one or more non-aromatic aliphatic diesters, followed by forming a layer of the polymer diester mixture.
The resultant separator, positionable between anode and cathode electrodes, comprises a porous core layer matrix, the layer having opposite surfaces, and at least one of the surfaces having a porous homopolymeric coating applied thereto.
Then remove the solvent plasticizer by applying a vacuum.
The separator construct is sufficiently permeable to electrolyte ions to minimally discharge a secondary battery having a carbonaceous or other lithium intercalation anode and a lithium metal oxide cathode, 30 percent at 2 C.
In use, the separator is a component of a rechargeable lithium battery comprising a housing, preferably sealed in plastic, electrodes contained in the housing including a carbonaceous or other lithium intercalation anode consisting of amorphous graphite, coke, filamentous carbon, or combinations thereof, and a lithium metal oxide cathode, an electrolyte solution in the housing, the electrolyte solution containing a lithium metal salt capable of ionizing in an organic solvent, the salt being dispersed in the organic solvent, current collectors electrically connected and disposed in contact with the electrodes, and the separator disposed between the electrodes, the separator including a fibrous matrix core having surfaces, and a porous hombpolymeric coating layer applied to at least one of the matrix core surfaces.
In the process of manufacturing the separator, a fibrous polymeric core matrix is coated with a second polymer mixture containing a non-aromatic solvent plasticizer of low boiling temperature, and acetone, and then removing the plasticizer by heating under vacuum, to create a microporous layer conductive to lithium salt ions
|
| Related patents |
|
|
Method of manufacture of an anode composition for use in a rechargeable electrochemical cell
In one broad aspect of this invention is a method of manufacturing an anode composition for use in a rechargeable electrochemical cell, wherein the anode comprises an ...
|
|
|
Intercell connector for lithium batteries
Having thus described the invention, what is claimed is: 1. An intercell assembly for lithium batteries, comprising an electrically insulating frame of thermoplastic ...
|
|
|
Nonaqueous-electrolyte secondary battery with a case having heat-welded portions
In view of the foregoing, an object of the present invention is to sufficiently maintain the sealing characteristics of leads of terminals of electrodes in the heat ...
|
|
|
Battery leakage containment system
OF THE PREFERRED EMBODIMENTS In the description which follows like parts are marked throughout the specification and drawing with the same reference numerals, ...
|
|
|
Battery cell cover assembly
We claim: 1. In a battery cell cover assembly in which a cover is fitted into the walls of an open-topped jar and a flowable, settable sealant joins the cover and jar, ...
|
|
|
Combined roof and solar heat structure
In accordance with the present invention, a building for a roof comprises a box-like structure open at the top and which preferably presents to the normal street-level ...
|
|
|
Generation of electrical power
This invention arises from a radical departure from prior-art thinking that to maintain a substantial temperature difference between the hot and cold junctions of a ...
|
|
|
Dual membrane, hollow fiber fuel cell and method of operating same
What is claimed is: 1. A gaseous fuel cell comprising in combination: a cell enclosure containing a body of aqueous inorganic acid electrolyte; a first, gas impermeable, ...
|
|
|
Titanium-based body-centered cubic phase alloy compositions and room temperature hydride-forming reactions of same
OF THE INVENTION The present invention involves the reaction of hydrogen gas at low temperature with a solid solution alloy having a body-centered cubic phase structure ...
|
|
|
Electric accumulator cell with at least one dissoluble electrode
What is claimed: 1. In an electric accumulator cell including at least one electrode formed of an inert conducting material insoluble in said electrolyte and an active ...
|
|
|
Fuel Cells 
