Valence Technology, Inc.

Altus Corporation

Other

On-Kok Chang

John C Hall

Jeffrey Phillips

Lenard F Silvester

M Yazid Saidi

Milton N Golovin

Lenard F Sylvester

The present invention provides a novel process for synthesizing vanadium oxide V.sub.6 O.sub.13 with a filament-like morphology by thermally decomposing ammonium metavanadate NH.sub.4 VO.sub.3 in the presence of a compound which sublimes upon heating. The reaction is carried out in an inert gas flow. The V.sub.6 O.sub.13 synthesized according to this invention can be used as cathode active material in electrochemical batteries.

Process for producing filament-like vanadium oxide for use in solid

The present invention is directed to an apparatus and method for improving the accuracy of measuring resistivity and/or conductivity of a paste. Exemplary embodiments relate to an apparatus for measuring electrical characteristics of a material. A sample of material is placed in a first charge conducting region with a first cross-sectional area and in a second charge conducting region with a second cross-sectional area, the first cross-sectional area being greater than the second cross-sectional area. Further, the apparatus conducts an electric charge through the first and second charge conducting regions via a conductive terminal located in the first charge conducting region.

Method and apparatus for measuring resistivity of geometrically

The present invention relates to an apparatus and method for measuring electrical characteristics of materials having undefined geometries in an accurate and reproducible manner. Generally speaking, electrical characteristics such as conductivity and resistance are measured by compressing the material with a predetermined force or pressure in a controlled manner to provide reproducible results.

An optical absorbance method for the quantitative determination of Lewis acid decomposition products in nonaqueous electrolytes.

Method to detect Lewis acid decomposition products in lithium

A sample holder for diffraction analysis protects air or moisture sensitive samples and accommodates samples of different sizes, both without contributing to background noise. In particular, a sample holder for beam diffractometery includes a holder body having a substantially flat beam-facing top surface and a through-hole extending through the top surface, a piston fitted in the through-hole so as to travel along an axis of the through-hole, and a cup-shaped cap fitted over at least a portion of the top surface, surrounding the through-hole. To minimize background noise, the top surface of the holder body and a top surface of the piston are made of quartz. For sample loading, a substantially flat plate and a mechanism for removably attaching the plate so as to overlie the top surface of the holder body are provided. The cap may be made of thin plastic so as to not affect the incident X-ray beam.

Controlled atmosphere, variable volume sample holder for x-ray

A battery unit includes a battery having an anode including an anode current collector tab, a cathode including a cathode current collector tab, and an electrolyte disposed between the anode and the cathode. The battery is sealed by packaging material such that portions of the anode current collector tab and the cathode current collector tab extend past the exterior of the packaging material. The extended portions of the anode current collector tab and the cathode current collector tab are secured to the exterior of the packaging material to reinforce the extended portions.

Battery unit with reinforced current collector tabs and method of making

A method and apparatus for drying a non-aqueous liquid electrolyte through the non-contact use of a desiccant includes a closed system having separate containers for the electrolyte and the desiccant. The closed system is charged with an inert gas, and a means is provided to circulate the gas between the containers. A stirring means is provided to stir the electrolyte to facilitate the release of water from the electrolyte.

Method and apparatus for drying a non-aqueous liquid electrolyte

Chromogenic solvent detectors are used to detect and map the presence of organic solvent-containing materials on a surface. The detector need only be applied to the surface to be tested. When removed, the dark areas on the detector correspond to those areas of the surface where an organic solvent-containing material was present. This method can be used to test the release properties of a release film.

Method of detecting and mapping organic solvent-containing materials on

A photometric detector is used to detect the presence of organic solvent vapors in the air. The detector need only be exposed to the air in the area to be tested. The optical density, i.e. darkness of the color of the detector determines the cumulative amount of solvent vapor exposure and the rate at which the dark color develops determines the concentration of solvent vapors in the air. This method can be used to quickly and easily test for harmful levels of toxic organic solvent vapors in the workplace or elsewhere.

Method of detecting organic solvent vapors

An electrochemical cell and method for improving voltage regulation of said cell. The cell employs lithium as an anode, lithium tetrachloroaluminate as an electrolyte, sulfur dioxide as a solvent, and high surface area carbon black containing cupric chloride as a cathode. Oxidizing agents such as halides and oxyhalides are employed to improve voltage regulation.

Electrolyte additives to improve voltage regulation in the

A rechargeable non-aqueous electrochemical cell. The cell has a positive terminal, a negative terminal, a cathode collector attached to the positive terminal and an anode of alkaline metal connected to the negative terminal. The cell further possesses a non-aqueous electrolyte solution in contact with the cathode and anode. The cathode collector is composed of a chrome foil plated upon a core of nickel.

Positive current collector for lithium secondary system

A rechargeable electrochemical cell which resists venting in an over-discharge condition. A first microporous membrane is provided as a separator between the cell's anode and cathode, which allows for the passage of cell electrolyte, but inhibits the passage of metal dendrites. A tab extends from the anode to the cell casing and between the tab and inner wall of the cell casing is provided a second microporous membrane characterized as being less resistant to the passage of alkaline metal dendrites than the first microporous membrane.

Overdischarge protection for rechargeable cells

A rechargeable electrochemical cell having a cell casing housing a stack of spirally wound elements which include an alkaline metal anode, a cathode or cathode collector and a separator. A method is provided for preventing alkaline metal dendrites from forming on any surface within the cell casing and external to the stack of spirally wound elements.

Cell design for spirally wound rechargeable alkaline metal cell

An electrochemical cell and method for improving voltage regulation of said cell. The cell employs lithium as an anode, lithium tetrachloroaluminate as an electrolyte, sulfur dioxide as a solvent, and high surface area carbon black containing cupric chloride as a cathode. A lithium halide, such as LiCl or LiBr, is employed to improve voltage regulation.

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San Jose, CA, United States of America

On-Kok Chang