Valence Technology, Inc.

Other

M Yazid Saidi

Jeremy Barker

Jeffrey L Swoyer

George William Adamson

Haitao Huang

Chariclea A Scordilis-Kelley

Ming Dong

Titus Faulkner

Rene Koksbang

Tracy E Kelley

Allan Dirilo

Porter H Mitchell

Gerbrand Ceder

Feng Gao

On Kok Chang

On-Kok Chang

Dane Morgan

Eileen S Saidi

Krishna Menon

Biying Huang

Arnold Stux

Santosh Mathew

James K Pugh

James Pugh

The invention provides electrode active materials comprising lithium or other alkali metals, manganese, a +3 oxidation state metal ion, and optionally other metals, and a phosphate moiety. Such electrode active materials include those of the formula:AMnMIMIIMIIIPOwherein

Manganese phosphates and related electrode active materials

The invention provides an electrochemical cell which includes a first electrode having a electrode active material, a second electrode which is a counter electrode to the first electrode, and an electrolyte. The positive electrode active material is represented by the general formula AVNb(PO), wherein 0&#x3c;a&#x3c;9, and 0&#x3c;b,c&#x3c;2.

Electrode active material for secondary electrochemical cell

The invention provides a novel polyanion-based electrode active material for use in a secondary or rechargeable electrochemical cell, wherein the electrode active material is represented by the general formula AM(SO)Z.

Alkali/transition metal halo-and hydroxy-phosphates and related electrode active materials

A secondary electrochemical cell is described having (a) a first electrode comprising an active material of the formula LiCoFeMMMXY, (b) a second electrode which is a counter-electrode to said first electrode; and (c) an electrolyte comprising an electrolyte salt, a cyclic ester and a carbonate selected from the group consisting of alkyl carbonates, alkylene carbonates, and mixtures thereof.

Batteries comprising alkali-transition metal phosphates and preferred electrolytes

The invention is directed to synthesizing a phosphate-based electrode active material. The method includes the step of reacting two or more starting materials collectively containing at least a POanion, an alkali metal and a metal which is redox active in the final reaction product, at a temperature and for a time sufficient to form the phosphate-based electrode active material.

Method for making phosphate-based electrode active materials

Methods for producing an electrode active material precursor, comprising;

Product and method for the processing of precursors for lithium phosphate active materials

Active materials for rechargeable batteries have a general formulaA(MO)M'XOwhere A represents an alkali metal or mixture of alkali metals, a is greater than about 0.1 and less than or equal to about 2; MO is an ion containing a transition metal M not in its highest oxidation state, M&#x2032; represents a metal, or mixture of metals, and b is greater than 0 and less than or equal to about 1, c is less than 1 wherein a, b and c are selected so as to maintain the electroneutrality of the compound, and X is phosphorus, arsenic, or sulfur, or mixtures thereof. Preferred active materials are alkali metal vanadyl metal phosphates of general formula A(VO)M&#x2032;POwhere a and b are both greater than 0 and c may be zero or greater. New synthetic routes are provided to alkali metal mixed metal phosphates where at least one of the starting materials is a metal-oxo group (MO), where M represents a metal in a +5 oxidation state. Reductive methods are provided for reacting a metal-oxo phosphate with an alkali metal compound in the presence of reducing carbon. The carbothermal reduction step can for example result in the reduction of a +5 metal to a +4 state or lower.

Battery active materials and methods for synthesis

Electrode active materials comprising two or more groups of particles having differing chemical compositions, wherein each group of particles comprises a material selected from:

Electrodes comprising mixed active particles

Electrode active materials comprising lithium or other alkali metals, a transition metal, and a phosphate or similar moiety, of the formula:AMPSiO

Alkali/transition metal phosphates and related electrode active materials

Sodium ion batteries are based on sodium based active materials selected among compounds of the general formula AM(XY)Z, wherein A comprises sodium, M comprises one or more metals, comprising at least one metal which is capable of undergoing oxidation to a higher valence state, Z is OH or halogen, and XYrepresents phosphate or a similar group. The anode of the battery includes a carbon material that is capable of inserting sodium ions. The carbon anode cycles reversibly at a specific capacity greater than 100 mAh/g.

Sodium ion batteries

The invention provides an electrochemical cell which includes a first electrode and a second electrode which is a counter electrode to said first electrode, and an electrolyte material interposed there between. The first electrode includes an alkali metal phosphorous compound doped with an element having a valence state greater than that of the alkali metal.

Electrode active material and method of making the same

The invention provides novel lithium-mixed metal materials which, upon electrochemical interaction, release lithium ions, and are capable of reversibly cycling lithium ions. The invention provides a rechargeable lithium battery which comprises an electrode formed from the novel lithium-mixed metal materials. Methods for making the novel lithium-mixed metal materials and methods for using such lithium-mixed metal materials in electrochemical cells are also provided. The lithium-mixed metal materials comprise lithium and at least one other metal besides lithium. Preferred materials are lithium-mixed metal phosphates which contain lithium and two other metals besides lithium.

Lithium-based active materials and preparation thereof

Methods for producing an electrode active material precursor, comprising:

The present invention relates to a method for preparing an electroactive metal polyanion or a mixed metal polyanion comprising forming a slurry comprising a polymeric material, a solvent, a polyanion source or alkali metal polyanion source and at least one metal ion source; heating said slurry at a temperature and for a time sufficient to remove the solvent and form an essentially dried mixture; and heating said mixture at a temperature and for a time sufficient to produce an electroactive metal polyanion or electroactive mixed metal polyanion. In an alternative embodiment the present invention relates to a method for preparing a metal polyanion or a mixed metal polyanion which comprises mixing a polymeric material with a polyanion source or alternatively an alkali metal polyanion source and a source of at least one metal ion to produce a fine mixture and heating the mixture to a temperature higher than the melting point of the polymeric material, milling the resulting material and then heating the milled material. It is another object of the invention to provide electrochemically active materials produced by said methods. The electrochemically active materials so produced are useful in making electrodes and batteries.

Synthesis of cathode active materials

A method for carrying out solid state reactions under reducing conditions is provided. Solid state reactants include at least one inorganic metal compound and a source of reducing carbon. The reaction may be carried out in a reducing atmosphere in the presence of reducing carbon. Reducing carbon may be supplied by elemental carbon, by an organic material, or by mixtures. The organic material is one that can form decomposition products containing carbon in a form capable of acting as a reductant. The reaction proceeds without significant covalent incorporation of organic material into the reaction product. In a preferred embodiment, the solid state reactants also include an alkali metal compound. The products of the method find use in lithium ion batteries as cathode active materials. Preferred active materials include lithium-transition metal phosphates and lithium-transition metal oxides. In a preferred embodiment, the reaction product contains carbon particles intimately mixed among crystals of the active materials.

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Henderson, NV, United States of America

M Yazid Saidi