Method For Producing High-Purity Electrode Materials

摘要

The present invention relates to a method for producing a lithium transition metal oxygen compound free from magnetic and solid contaminants which is obtained by a combination of different isolation steps integrated into the production method. The isolation of solid and magnetic particles from the compound can be achieved through targeted use of different isolation steps. The material has improved electronic properties as active material in electrodes of lithium-ion batteries because of the very high purity.

主权项

1. A method for producing a fine-particulate mixed lithium transition metal phosphate or lithium titanate free from magnetic contaminants, comprising the steps of:
a) providing at least one starting compound of the lithium transition metal phosphate or lithium titanate, the starting compound comprising a lithium source, a transition metal source, and a phosphate source, or a lithium source, a titanium source, and an oxygen source, wherein magnetic contaminants and undissolved or unsuspended particles are removed from at least one source; b) converting the at least one starting compound to a precursor mixture and/or precursor suspension, which is then optionally converted to a lithium transition metal phosphate or lithium titanate compound in the form of a suspension, and removing magnetic and/or oxidic contaminants and undissolved or unsuspended particles from said mixture and/or suspension, wherein said converting takes place under hydrothermal conditions at temperatures between 100° C. and 250° C.; and c) obtaining the lithium transition metal phosphate compound or lithium titanate compound, or the precursor mixture and/or precursor suspension, which is then thermally treated, and removing magnetic contaminants from said compound, mixture and/or suspension.