Method for preparing coated electrode active material

• Main Author: HAN ZHENJI
• Format: Patent
• Language: Chinese; English
• Published: 21.03.2023
• Subjects: BASIC ELECTRIC ELEMENTS; ELECTRICITY; PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSIONOF CHEMICAL INTO ELECTRICAL ENERGY

The present invention relates to a method for preparing a coated positive electrode active material, comprising the steps of: (a) providing a particulate electrode active material according to the general formula Li1 + xTM1-xO2, where TM is Ni and optionally at least one of Co and Mn and optionally at least one element selected from the group consisting of Al, Mg and Ba, transition metals other than Ni, Co and Mn, and x is 0-0.2, where at least 50 mol% of the transition metal of TM is Ni, and x is 0-0.2, where at least 50 mol% of the transition metal of TM is 0-0.2; (b) treating the particulate electrode active material with an aqueous medium which may comprise a heteropolyacid or a compound of Al or Sb, (c) at least partially removing water from step (b), (d) optionally adding at least one heteropolyacid or a compound of Al or Sb in the form of a particulate compound or an aqueous solution or slurry, (e) optionally heat treating the mixture obtained from step (d), (f) adding at least one compound selected fr