Dow Global Technolgoies LLC

Renata Ag

Toyota Jidosha Kabushiki Kaisha

Ivan Exnar

Thierry Drezen

Motoshi Isono

Ladislav Kavan

Michael Graetzel

Jean-Paul Randin

Michael Gratzel

Shaik Mohammed Zakeeruddin

Marketa Zukalova

James Miners

Otakar Frank

Nam Hee Kwon-Roth

Qing Wang

Ivo Teerlinck

Motoshiv c/o Toyota Jidosha Kk Isono

Ivoc/o Toyota Motor Europe NV/SA Teerlinck

The present invention concerns a carbon coated lithium metal phosphate material containing a manganese oxide layer between the LiMnPO4 material or the C/LiMnZPOmaterial, where Z=Fe, Co, Ni, Mg, Ca, Al, Zr, V, Ti and x=0.01-0.3, and the carbon layer.

Carbon coated lithium manganese phosphate cathode material

Novel process for the preparation of finely divided, nano-structured, olivine lithium metal phosphates (LiMPO) (where metal M is iron, cobalt, manganese, nickel, vanadium, copper, titanium and mix of them) materials have been developed. This so called Polyol' method consists of heating of suited precursor materials in a multivalent, high-boiling point multivalent alcohol like glycols with the general formula HO&#x2014;(&#x2014;CHO&#x2014;), &#x2014;H where n=1-10 or HO&#x2014;(&#x2014;CHO&#x2014;)&#x2014;H where n=1-10, or other polyols with the general formula HOCH&#x2014;(&#x2014;CHOH&#x2014;)&#x2014;H where n=1-10, like for example the tridecane-1,4,7,10,13-pentaol. A novel method for implementing the resulting materials as cathode materials for Li.-ion batteries is also developed.

Synthesis of nanoparticles of lithium metal phosphate positive material for lithium secondary battery

A process for the production of nano-structured olivine lithium manganese phosphate (LiMnPO) electrode material comprising of the following steps: sol gel preparation in a chelating environment; preparation of lithium manganese phosphate/carbon composite by ball-milling; and electrode preparation.

Lithium manganese phosphate positive material for lithium secondary battery

This invention concerns a novel method for surface derivatization of electrode materials for Li-ion batteries. The derivatization is based on adsorption of a composite assembly consisting of amphiphilic redox active molecule attached to single walled carbon nanotube (SWCNT). Its role consists in the enhancement of electronic conductivity of electrode materials, such as phosphate olivines, without requesting any significant increase of the electrode volume and mass. The SWCNT is linked to the redox molecule via non-covalent or covalent interaction with the hydrophobic part of the molecule or electrostatic interaction. The hydrophilic part of the molecule serves as the anchoring site for surface modification of the electrode active material. The redox potential of the molecule is close to the redox potential of the electrode active material. The adsorbed assembly of redox-molecule & SWCNT thus improves the charge transfer from a current collector to the electrode active material.

Nanotube wiring

A lithium-ion battery comprising a first electrode made of cathodic material, a second electrode made of anodic material and an electrolyte, said lithium-ion battery containing an overcharge protection material consisting of redox molecules, characterized by the fact that said redox molecules have a reduction potential which is lower than said anodic material.

Overcharge and overdischarge protection in lithium-ion batteries

The main object of the invention is to obtain LiMnPOhaving an excellent crystalline and a high purity at a lower temperature. The present invention provides a method for manufacturing LiMnPO4 including the steps of: precipitating for obtaining precipitate of manganese hydroxide (Mn(OH)) by adding a precipitant to a Mn source solution in which a Mn source is dissolved; reducing for obtaining a reduced dispersion solution by dispersing the precipitate in a reducing solvent; adding for obtaining an added dispersion solution by adding a Li source solution and a P source solution to the reduced dispersion solution; pH adjusting for adjusting the pH of the added dispersion solution in the range of 3 to 6 to obtain a pH-adjusted dispersion solution; and synthesizing for synthesizing by reacting the pH-controlled dispersion solution by a heating under pressure condition.

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The invention concerns a battery including a metallic container () delimiting a cavity () containing an electrolyte and a composite strip () formed by a first metallic sheet coated with a material forming the positive electrode, by a second metallic strip coated with a material forming the negative electrode and by porous insulating separators, composite strip () being wound onto a core () located at the centre of the cavity () and electrodes being connected by connecting means () to external terminals (). It is characterized in that all or part of the central core () is made of a material with a high heat transmission coefficient in heat contact with at least the metallic closing cap ().

Rolled electrode battery with heat sink

A high capacity primary or secondary electrochemical generator in which at least one electrode (4,5) is composed of nanocrystalline particles of an electrically active material, said particles being electrically connected together, either by sintering a colloidal film of said electrically active material, or by compressing a mixture containing said nanocrystalline particles in pulverised form.

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Itingen, Switzerland

Ivan Exnar