Valence Technology, Inc.

Other

Alcatel

Ib I Olsen

Rene Koksbang

Xavier Andrieu

Fran&ccedil;ois Boudin

Eric Pasquier

Jeremy Barker

Benjamin M Chaloner-Gill

Russell D Moulton

Laurent Moreau

Porter H Mitchell

Dale R Shackle

Jerry L Morris

Eileen S Saidi

David A Velasquez

Douglas B Holmes

Neal Golovin

Michael A Gee

Gert L Jensen

Douglas J Payne

James Buckley

An organic electrolyte electric cell includes a first electrode having the superposition of a first layer containing an electrochemically active material and a porous second layer constituted by a polymeric material and having a free face. A second electrode is provided with a porous layer having at least one free face and containing an electrochemically active material, and the electrodes are assembled by adhesive bonding. The bonding is carried out by coating an adhesive onto the free face of the porous layer of one of the two electrodes and then bringing the free face coated with a film of adhesive into contact with the free face of the porous layer of the other electrode to form an electrochemical couple.

Organic electrolyte electric cell

An electrochemical cell having a cell package made of a metallic material to allow the cell package to be sealed by welding, even when contaminated. The electrochemical cell further includes an electrode cell stack and a metallic cell package having a base portion and a lid portion which are welded to each other (peripheral seam) to define an enclosure. The cell package includes a first section for receiving the cell stack and a second section having an inlet port and a degassing port which communicate with the first section. The lid portion is welded to the base portion to form a weld seam located between the first and second sections to seal off the first section from the second section. The weld seam extends from the peripheral seam on a first side of the cell package to the peripheral seam on a second side of the cell package.

Method of fabricating electrochemical cell

Electrochemical cell

A cell package is made of a laminate which can be heat sealed even when the cell package is contaminated with electrolyte. The laminate includes a polyester outer layer, an aluminum barrier layer and a polypropylene inner layer which are adhered together by an adhesive which does not break down in the presence of electrolyte.

Cell package

In a process for the production of an organic electrolyte electric cell with a unitary structure comprising at least one pair of electrodes comprising a first electrode comprising the superposition of a first layer containing an electrochemically active material and a porous second layer constituted by a polymeric material and having a free face and a second electrode comprising a porous layer having at least one free face and containing an electrochemically active material the electrodes are assembled by adhesive bonding. The bonding is carried out by coating an adhesive onto the free face of the porous layer of one of the two electrodes and then bringing the free face coated with a film of adhesive into contact with the free face of the porous layer of the other electrode to form an electrochemical couple.

Process for the production of an electric cell with a unitary structure

A polymeric separator for an organic electrolyte electrochemical system comprises an elastomeric polymer, optionally, a polymer which swells in the organic electrolyte and with which the elastomeric polymer forms an alloy and, optionally, an inorganic compound. The polymeric separator has a microporous structure characterized by a porosity in the range 30% to 95% and pores with an average diameter in the range 0.1 &mgr;m to 5 &mgr;m

Organic electrolyte electrochemical system including a polymeric separator

A polymeric separator for an organic electrolyte electrochemical system comprises an elastomeric polymer, optionally, a polymer which swells in the organic electrolyte and with which the elastomeric polymer forms an alloy and, optionally, an inorganic compound. The polymeric separator has a microporous structure characterized by a porosity in the range 30% to 95% and pores with an average diameter in the range 0.1 &mgr;m to 5 &mgr;m.

Process for producing an electrolytic cell having a polymeric separator

Provided by the present invention is a new anode material comprised of a carbon obtained by pyrolyzing a polymer of a conjugated vinyl monomer. The carbon is suitable for a lithium intercalated anode as it offers potential advantages of high capacity. The economics of manufacturing such anodes are also beneficial.

Carbon based electrodes

A new technique for securing into place a plurality of layers which make a battery body, and for preventing electrical short-circuits within the battery by retarding the formation of dendritic growths is disclosed. A radiation curable layer of material is coated onto a portion of at least one outwardly exposed face of a battery body, whereupon the layer of material is then cured. The cured layer of material is positioned relative to the body such that the cured layer provides support to the body in a manner to secure in place a plurality of layers which make up the battery body, thereby ensuring proper electrical contact between the plurality of layers. In addition, the cured layer of material is also positioned such that the cured layer inhibits formation of short circuiting electrical paths between the anode and cathode layers of the battery, the paths being caused by formation of dendritic growths extending out from the anode layer towards the cathode layer.

Radiation curable frame for stacked cell construction and for edge

A method of increasing the amount of alkali metal that is available during charge/discharge of an electrochemical cell that employs carbon based intercalation anodes is provided. The method comprises of prealkaliation of the carbon anode. By subjecting the anode carbon to the prealkaliation process prior to packaging the electrochemical cell, substantially all the alkali metal (e.g., lithium) which is originally present in the cathode will be available for migration between the anode and cathode during charge/discharge.

Process for prelithiation of carbon based anodes for lithium ion

A method for removing plasticizers such dibutyl phthalate from the anode, cathode, and polymeric matrix components of electrochemical cell precursors using carbon dioxide in the supercritical state is provided. The method forms porous polymeric structures that enhances the mass transport of ions in the cell which results in improved electrochemical performance.

Apparatus and method of preparing electrochemical cells

In a new process for making an electrode current collector assembly, an electrode composition is mixed with a volatile casting solvent and is coated onto a substrate. Then, the coated substrate is heated to drive off a major portion of the volatile casting solvent. Next, force is applied on an external surface of the coating and directed toward the substrate so as to compact the coating and reduce the volume of pore spaces in the coating. An electrolyte composition may be applied to the compacted electrode composition either before or after curing. The electrode and electrolyte compositions are each cured. In a final step, a counter-electrode layer is applied onto the electrolyte composition to form a cell assembly.

Method for producing low porosity electrode

A secondary, solid electrolytic battery includes a number of electrically connected electrolytic cells wherein for each cell the anode and cathode are separated from each other by a mask that is a layer of electrically insulative material that is coated along the perimeter of the anode and/or cathode. The mask reduces the rate of dendrite formation and prevents edge-effects, short circuits, and related problems caused by inadvertent contact of the anode and cathode.

Battery mask from radiation curable and thermoplastic materials

Process for prelithiation of carbon based anodes for lithium batteries

A solid electrolyte that includes (1) a first catalyst that is capable of initiating the polymerization of solvent components at elevated temperatures in order to increase the resistance (or impedance) of the solid electrolyte and thereby prevent thermal runaway and/or (2) a second catalyst that is capable of initiating the polymerization of flammable substances (e.g., olefins) in the solvent and batteries make therefrom are provided. To assure that the catalysts do not prematurely initiate polymerization below a certain temperature, the catalysts may be microencapsulated within a heat sensitive material that disintegrates or dissolve at a predetermined elevated temperature to release the catalysts. Microencapsulation permits the controlled release of the catalysts into the electrolyte under the appropriate conditions.

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San Jose, CA, United States of America

Ib I Olsen