Valence Technology, Inc.

Other

Ralph J Brodd

Benjamin M Chaloner-Gill

Joseph T Lundquist

Milton N Golovin

Mark Joseph Isaacson

A method for removing HF from a solid electrolyte using alumina is disclosed. The solid electrolyte contains a polymeric matrix, a salt, a solvent, and a toughening agent. The toughening agent may include alumina, silica, zeolite, and metal oxides (e.g., calcium oxide and magnesium oxide), and mixtures thereof. The toughening agent acts as a drying agent to remove excess solvent in the electrolyte. The solid electrolytes have improved mechanical strength and adherence to the anode and cathode.

Method for removing acidic impurities in a solid electrolyte

A solid electrolyte containing a polymeric matrix, a salt, a solvent, and a toughening agent, is provided. The toughening agent may include alumina, silica, zeolite, and metal oxides (e.g., calcium oxide and magnesium oxide), and mixtures thereof. The toughening agent acts as a drying agent to remove excess solvent in the electrolyte. The solid electrolyte have improved mechanical strength and adherence to the anode and cathode.

Solid electrolytes containing toughening agents and electrolytic cells

The present invention provides a novel process and apparatus for coating electrically conductive substrate with alkali metal by vacuum metallizing. Novel methods and apparatus are provided to protect the alkali metal surface against atmospheric degradation. The alkali metal coated substrate prepared according to this invention can be used as an anode in electrochemical batteries.

Process and apparatus for producing thin lithium coatings on

Charge rates of individual battery cells are equalized and battery safety increased by limiting the amount of current that will flow through the battery in the event of a short circuit either external to or internal to the battery. A solid-polymer battery having a cathodic layer, an anodic layer, an ionically conductive polymeric electrolyte situated intermediate the cathodic layer and the anodic layer, a first electrode electrically connected to the cathodic layer, and a second electrode electrically connected to the anodic layer, has additionally an electronically conductive polymeric layer situated intermediate the first and second electrodes and having a resistivity within a range so as to limit current flow through the battery in case of the occurrence of a short circuit between the cathodic layer and the anodic layer, and to reduce a terminal voltage of the battery no more than few percent as compared to what the terminal voltage of the battery would be without the electronically conductive polymeric layer. The electronically conductive polymeric layer limits the amount of current that will flow through the battery in the event of a short circuit either external to or internal to the battery. Alternatively, a battery is made up of a plurality of electrochemical hi-fold cells each having a relatively thin layer of anode material and a relatively thin strip of cathode material separated from said anode layer by an interposing solid electrolyte layer, thereby forming a cell laminate with the electrolyte layer and the anode layer, the cell laminate being folded at a fold so as to form a bi-fold cell; a cathode current collector strip; and a resistive adhesive polymer applied to a contact area of the cathode current collector strip so as to attach the cathode current collector strip to each of the bi-fold cells at the fold, the adhesive having a resistivity within a range so as to limit current flow through the battery but reducing a terminal voltage of the battery no more than few percent as compared to what the terminal voltage of the battery would be without the resistive adhesive. The resistive adhesive polymer equalizes charge rates of individual battery cells.

Equalizing charge rates of individual battery cells

Vanadium oxide cathode mixtures which comprise a vanadium oxide cathode material in combination with one or more surface active agents and the incorporation thereof in electrochemical cells as a means for enhancing cumulative capacity and cycling capacity of such cells.

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Morgan Hill, CA, United States of America

Ralph J Brodd