Verfahren zur herstellung eines elektrodenaktivmaterials und elektrodenaktivmaterial

Abstract

Process for making an electrode active material wherein said process comprises the following steps: (a) Providing a hydroxide TM(OH)2 or an oxyhydroxide of TM wherein TM is one or more metals and contains Mn and, optionally, Co, and from 85 to 95 mol% Ni, referring to the sum of Ni, Co and Mn, (b) Drying said hydroxide TM(OH)2 or oxyhydroxide of TM at a temperature in the range of from 400 to 600°C, thereby obtaining an oxide or oxyhydroxide of TM with a residual moisture content of from 200 to 500 ppm, (c) mixing said oxide or oxyhydroxide from step (b) with a source of lithium and with at least one compound of Mg or Al and with at least one compound of Ti or Zr, (d) treating the mixture obtained from step (c) thermally at a temperature in the range of from 550 to 875°C, followed by (e) optionally, a step (e) of treating the material obtained from step (d) with an aqueous medium, followed by a liquid-solid separation step, and (f) a step (f) of adding a compound of tungsten or of boron to the material obtained from step (d) or (e), respectively, and a subsequent thermal treatment at a temperature in the range of from 150 to 600°C.