Method of reducing magnetic and/or oxidic contaminants in lithium metal oxygen compounds
AssigneeSued-Chemie IP GmbH & Co. KG
InventorsMichael Holzapfel, Christian Vogler
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Abstract
A method of reducing magnetic and/or oxidic contaminants in lithium metal oxygen compounds in particle form, in order to obtain purified lithium metal oxygen compounds, by means of treatment in a grinding process and sifting process with continuous or non-continuous removal and obtaining of the purified lithium metal oxygen compound. The grinding process and sifting process are terminated prematurely before the residue amounts to less than 1% of the quantity m. The residue, containing contaminants, is discarded.
Claims15
A method of reducing magnetic and/or oxidic contaminants in doped and non-doped lithium metal oxygen compounds in particle form, comprising the steps of:
- a) providing a lithium metal oxygen compound in a quantity m, containing contaminants;
- b) introducing a portion of from 5 to 15% of the quantity m of the lithium metal oxygen compound;
- c) grinding and sifting the lithium metal oxygen compound with continuous removal and obtaining of the purified lithium metal oxygen compound to a residue of from 3% to 0.01% of the quantity m;
- d) removing the purified lithium metal oxygen compound;
- e) discarding the residue;
- and
- f) repeating steps b) to e) until the whole quantity m has been converted.
Dependencies are inferred from the claim text.