Process for making cathode materials, and reactor suitable for carrying out said process

Abstract

Process for making an at least partially coated particulate material, said process comprising the following steps: (a) providing a particulate material selected from lithiated nickel-cobalt aluminum oxides and layered lithium transition metal oxides, (a) treating said cathode active material with a metal alkoxide or metal amide or alkyl metal compound in a fluidized bed, (b) treating the material obtained in step (b) with moisture in a fluidized bed, and, optionally, repeating the sequence of steps (b) and (c), wherein the superficial gas velocity in the fluidized beds in steps (b) and (c) decreases with increasing reactor height.

Claims

1. A tubular reactor, comprising at least one conical part and, optionally, at least one part with constant diameter, wherein the tubular reactor has at least four joining inlets that join under a reaction zone, of which one serves as a reactive gas inlet, one serves as a filter purge gas inlet, one serves for primary fluidizing gas introduction, and one serves as a particle outlet; wherein the at least four joining inlets join each other under the reaction zone; and wherein the tubular reactor is suited for carrying out a process for making an at least partially coated particulate material.

2. The tubular reactor of claim 1, wherein a wall material is chosen from ceramic materials and stainless steel and the wall material may or may not be coated with aluminum oxide.

3. The tubular reactor of claim 1, wherein any additional inlet are not gas inlets.

4. A process for chemically coating a particulate material, the process comprising employing the tubular reactor of claim 1.

Description

BRIEF DESCRIPTION OF FIGS. 1 AND 2

(1) 1: inlet primary fluidization gas

(2) 2: inlet pulsation gas

(3) 3: outlet coated particles

(4) 4: fluidized bed

(5) 5: conical part of the reactor, diameter d.sub.1 at the mixing faucet

(6) 6: cylindrical part of the reactor, diameter d.sub.2

(7) 7: optional: means for solid-gas separation, for example filter candle or filter cartridge

(8) 8: optional: inlet for introduction of non-coated particles

(9) 9: optional: introduction of solid particles

(10) Solid particular material may be introduced from the top or through inlet 8 or from the bottom of the reactor