Merck Patent Gesellschaft MIT Beschrankter Haftung

Zentrum Fur Sonnenenergie-und Wasserstoff-forschung Baden-wurttenberg, Gemeinnutzige Stiftung

Giesela Arnold

Christian Vogler

Margret Wohlfahrt-Mehrens

Reinhard P Hemmer

Michael Schmidt

The invention relates to binary, ternary and quaternary lithium phosphates of general formula Li(FeMM)POwherein Mrepresents at least one element of the group comprising Sc, Ti, V, Cr, Mn, Co, Ni, Cu, Zn, Be, Mg, Ca, Sr, Ba, Al, Zr, and La; Mrepresents at least one element of the group comprising Sc, Ti, V, Cr, Mn, Co, Ni, Cu, Zn, Be, Mg, Ca, Sr, Ba, Al, Zr, and La; x=between 0.5 and 1, y=between 0 and 0.5, z=between 0 and 0.5, provided that x+y+z=1, or x=0, y=1 and z=0. The said lithium phosphates can be obtained according to a method whereby precursor compounds of elements Li, Fe, Mand/or Mare precipitated from aqueous solutions and the precipitation product is dried in an inert gas atmosphere or a reducing atmosphere at a temperature which is between room temperature and approximately 200&#xb0; C. and tempered at a temperature of between 300&#xb0; C. and 1000&#xb0; C. The inventive lithium phosphates have a very high capacity when used as cathode material in lithium accumulators.

Binary, ternary and quaternary lithium phosphates, method for the production thereof and use of the same

A process for recycling electrode materials from spent lithium batteries in which negative-electrode materials from the lithium/transition-metal mixed oxide class of compounds from discharged, spent lithium batteries can, after comminution of the electrode constituents, be re-synthesized into chemically identical products as employed for the production of the batteries comprising mechanical and extractive processing of these constituents with the aim of removing positive-electrode constituents and other secondary constituents, such as binders and other processing auxiliaries, followed by controlled high-temperature treatment without leaving thermal decomposition products behind.

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Ulm, Germany

Giesela Arnold