Method for preparing a positive electrode active material for rechargeable batteries

Method for manufacturing a positive electrode active material for solid-state rechargeable batteries comprising Li, O and M, wherein M consists of:

• Co in a content x superior or equal to 0 mol % and inferior or equal to 35.00 mol %,
• Mn in a content y superior or equal to 0 mol % and inferior or equal to 35.00 mol %,
• A in a content z superior or equal to 0 mol % and inferior or equal to 10.00 mol %, whereby A is at least one element selected from:
• B, Mg, Al, Nb, Ti, W, Y, Ca, S, P, Sn, Si and Zr, and
• Ni in a content of 100.00 mol %-x-y-z,
• whereby the contents x, y, and z are contents relative to M and are as determined by ICP,
• whereby the method comprises the following steps:
• Step 1:
• preparing a slurry, whereby the slurry comprises a liquid and a lithium mixed metal oxide powder, whereby the lithium mixed metal oxide powder comprises Li, O and Q, wherein Q consists of:
• Co in a content a superior or equal to 0 mol % and inferior or equal to 35.00 mol %,
• Mn in a content b superior or equal to 0 mol % and inferior or equal to 35.00 mol %,
• G in a content c superior or equal to 0 mol % and inferior or equal to 10.00 mol %, whereby G is at least one element selected from:
• B, Mg, Al, Nb, Ti, W, Y, Ca, S, P, Sn, Si and Zr and
• Ni in a content of 100.00 mol %-a-b-c,
• whereby the contents a, b, and c are contents relative to Q and are as determined by ICP,
• Step 2:
• mixing said lithium mixed metal oxide powder, before and/or after and/or during step 1, with a cation precursor comprising at least one cation selected from:
• Al3+, La3+, Co2+, Co3+, Mn2+, Mn3+, Mn4+, Mn6+, Zn2+, Cu+, Cu2+, Mg2+, and with an anion precursor comprising at least one anion having a general formula A′y−Oz−−x′, wherein A′ is selected from:
• B, Al, Sn, Si, P, W, wherein 0.5≤x′≤4, 0.5≤y′≤2 and 1≤z′≤12;
• Step 3:
• filtering and optionally drying said slurry to obtain a wet or dry solid fraction, whereby step 3 is optional;
• and
• Step 4:
• heating the slurry resulting from steps 1 and 2 or the solid fraction resulting from step 3 at a temperature in the range of 300° C. to 1000° C.