Dow Corning Corporation

Moli Energy (1990) Limited

Moli Energy Limited

Nec Moli Energy (canada) Limited

Her Majesty the Queen in Right of the Provence of British Columbia

Her Majesty the Queen in Right of the Province of British Columbia

Jeffery R Dahn

Gregg A Zank

Alf M Wilson

Weibing Xing

Ulrich Von Sacken

David S Wainwright

Alfred M Wilson

David P Wilkinson

Jan Naess Reimers

Katsuya Eguchi

Qiming Zhong

Rosamaria Fong

Jiayu Simon Xue

Erik Rossen

Brian M Way

Yuan Gao

Eric Wayne Fuller

A lithium ion battery electrode formed by the pyrolysis of a silane polymer followed by introducing lithium ions. These electrodes can be used to form batteries with large capacities, low irreversible capacity, high density and good safety behavior.

Electrodes for lithium ion batteries using polysilanes

Lithiated manganese oxides are synthesized using a novel two stage process. Using appropriate starting materials, lithiation is accomplished via low temperature ion exchange in aqueous warm salt solution. A drying stage follows which completes the synthesis. Materials suitable for use as cathodes in lithium ion rechargeable batteries have been prepared in this way. Other solid solution transition metal materials might also be prepared using a similar low temperature ion exchange process.

Method for preparing solid solution materials such as lithium manganese

A lithium ion battery electrode formed by the pyrolysis of a polycarbosilane followed by introducing lithium ions. These electrodes can be used to form batteries with large capacities, low irreversible capacity, high density and good safety behavior.

Method of forming electrodes for lithium ion batteries using

A lithium ion battery electrode formed by the pyrolysis of a siloxane polymer of the structure

Electrodes for lithium ion batteries using polysiloxanes

Spinel insertion compounds Li.sub.1+x Mn.sub.2-x-y M.sub.y O.sub.4 wherein M is a transition metal, 0&lt;x&lt; about 0.33, 0.ltoreq.y&lt;about 1, can have relatively low surface area at relatively large values of x when prepared with a novel two step heating method. Li.sub.1 Mn.sub.2-y M.sub.y O.sub.4 is first prepared between a critical temperature, T.sub.c, and about 900.degree. C. Then, a lithium salt is mixed therewith and reacted at a temperature between about 400.degree. C. and T.sub.c. These compounds are suitable for use as a cathode in a lithium battery. The use of LiCl as the lithium salt can provide improved cycle life results in such a battery.

Method for preparing Li.sub.1+x Mn.sub.2-x-y M.sub.y O.sub.4 for use in

Carbonaceous insertion compounds and methods for preparation are described wherein the compounds comprise silicon and oxygen and are characterized by x-ray diffraction patterns that resemble that of amorphous silicon dioxide. The compounds can exhibit a large reversible capacity for lithium and can be prepared by simple pyrolysis of suitable polymer/s containing silicon, oxygen and carbon at an appropriate temperature. These insertion compounds may be suitable for use as high capacity anodes in lithium ion batteries.

Carbonaceous insertion compounds and use as anodes in rechargeable

A lithium ion battery electrode formed by the pyrolysis of a silazane polymer followed by introducing lithium ions. These electrodes can be used to form batteries with large capacities, low irreversible capacity, high density and good safety behavior.

Electrodes for lithium ion batteries using polysilazanes ceramic with

Carbonaceous compounds and methods for preparation are described wherein the compounds comprise a pre-graphitic carbonaceous host having organized and disorganized regions and wherein atoms of other elements are incorporated in the host without changing the structure of the organized regions. A carbonaceous insertion compound with large reversible capacity for lithium can be prepared using elements capable of alloying with lithium, such as Si, as the incorporated atoms. These insertion compounds are suitable for use as high capacity anodes in lithium ion batteries.

Carbonaceous host compounds and use as anodes in rechargeable batteries

Carbonaceous insertion compounds and methods for preparation are described wherein the compounds comprise a pre-graphitic carbonaceous host and atoms of an element capable of alloying with alkali metal atoms, the alloying atoms being incorporated predominantly as monodispersed atoms in the host. A carbonaceous insertion compound with large reversible capacity for lithium can be prepared if the alloying atoms incorporated are Si. Such insertion compounds can be prepared by simple pyrolysis of suitable polymers containing silicon and carbon at an appropriate temperature. These insertion compounds may be suitable for use as high capacity anodes in lithium ion batteries.

Lithiated nickel dioxide cathode-active materials for electrochemical cells aving the formula Li.sub.x Ni.sub.2-x-y M.sub.y O.sub.2, with x being between about 0.8 and about 1.0, M being one or more metals selected from cobalt, iron, chromium, titanium, manganese and vanadium, and y being less than about 0.2, with the proviso that y is less than about 0.5 for cobalt, which material is substantially free of lithium hydroxide and lithium carbonate. The materials are prepared by providing a substantially homogeneous dry intermediate mixture of a starting material containing a nickel compound selected from nickel oxide, nickel hydroxide, and mixtures thereof, and optionally including one or more oxides or hydroxides of a transition metal selected from cobalt, iron, chromium, titanium, manganese and vanadium, together with between about a 10 and about a 25% stoichiometric excess of lithium hydroxide. The mixture is heat treated at a temperature above about 600.degree. C. in an atmosphere substantially free of carbon dioxide and having a partial pressure ratio of oxygen to water vapor greater than about 15, after which any lithium hydroxide or lithium carbonate present in the mixture is removed. Thermally stable lithiated nickel dioxide having a BET surface area less than about 3.0 m.sup.2 /g, and is also disclosed, as well as electrochemical cells prepared from the disclosed lithiated nickel dioxides.

Lithiated nickel dioxide and secondary cells prepared therefrom

A secondary electrochemical cell including a first electrode and a counteectrode each capable of reversibly incorporating an alkali metal, an alkali metal incorporated in at least one of the electrodes and an electrolyte solution containing an organic solvent, a salt of the alkali metal and at least one sequestering agent capable of complexing with the alkali moiety of the electrolyte salt, wherein the first electrode includes a carbon composition having a degree of graphitization greater than about 0.40. A method for intercalating alkali metal ions into a highly graphitic carbonaceous electrode material by contacting the electrode material with an electrolyte solution of an electrolyte solvent, an alkali metal electrolyte salt and at least one sequestering agent capable of complexing with the alkali metal moiety of the electrolyte salt, which electrolyte solution is also in contact with a counterelectrode, and applying a current between the electrode material and counterelectrode so that the alkali metal ions intercalate into the electrode material from the electrolyte solution, which sequestering agent substantially prevents cointercalation of the electrolyte solvent with the alkali metal ions into the electrode material.

Electrolyte solution sequestering agents for electrochemical cells

An electrode precursor for lithium batteries includes a layer of an electrochemically active particulate material and a binder. The binder is soluble in the cell electrolyte so that the electrolyte extracts the binder from the particulate material after assembly, leaving a particulate layer substantially devoid of binder. Thus, the binder does not significantly decrease electrical conductivity of the layer in the cell and does not impede the ionic access to the layer. The soluble binder may be present in the electrode precursor in an amount sufficient to protect particulate which would otherwise react with the atmosphere.

Electrochemical cells, electrodes and methods of manufacture

Cathode-active material for electrochemial cells is prepared by reacting gamma phase MnO.sub.2 with Li. The molar ratio of Li to MnO.sub.2 is about 0.33 to about 0.43.

Growing community of inventors

Surrey, Canada

Jeffery R Dahn