Intelligent production process for lithium battery positive electrode material

Abstract

The invention discloses an intelligent production process for a lithium battery positive electrode material. The process comprises the following steps of: 1) automatically and accurately proportioning lithium battery positive electrode preparation raw materials and then mixing; 2) enabling the mixed raw materials to enter a rolling granulator for rolling to form elliptic particles; 3) feeding the particles into a rotary furnace for sintering through a vibratory feeder, wherein the inner wall of the rotary furnace is made from a Cr-Ni-Fe alloy with a designation of Inconel 602 or the inner surface of the inner wall of the rotary furnace is welded and covered with a ceramic sheet; 4) enabling the sintered material to enter a mechanical grinder or a jet mill for grinding; 5) enabling the ground fine material to enter a batch mixing device for mixing; and 6) finally enabling the mixed material to enter an automatic packaging system for packaging after passing through a screening device and an electromagnetic iron removal machine. According to the process, the continuous rotary furnace is adopted, so that the sintering capacity is greatly increased; and by adding a process step of rolling before sintering, the positive electrode material powder is made into the elliptic particles, so that the material can be prevented from being adhered to the wall during sintering.

Description

technical field [0001] The invention relates to an intelligent production process for a positive electrode material of a lithium battery, and belongs to the technical field of lithium batteries. Background technique [0002] Lithium battery cathode materials mainly include: lithium cobalt oxide, lithium manganate, lithium iron phosphate and ternary materials. At present, the main production processes of cathode materials are: compounding, sintering in pusher furnace or roller furnace, coarse crushing, fine crushing, batch mixing, screening, iron removal, and packaging. Among them, the most energy-consuming process is the sintering furnace. Whether it is a push-plate furnace or a roller furnace, it is static sintering. It is easy to cause over-burning or burning. A few manufacturers use continuous rotary kilns, but there are two major problems in continuous rotary kilns: First, because the powder particles are small, generally 0.1um-50um, the powders are easy to stick to th...

AI Technical Summary

Problems solved by technology

Among them, the most energy-consuming process is the sintering furnace. Whether it is a pusher furnace or a roller furnace, it is static sintering, which has the disadvantages of large sintering energy consumption, long cycle, short service life of the sagger, complicated operation, low production efficiency, and poor heating. Uniformity, heat preservation and cooling time are not easy to control, etc., which may easily cause overheating or raw burning

A small number of manufacturers use continuous rotary furnaces, but there are two major problems in continuous rotary furnaces: First, due to the small powder particles, generally 0.1um-50um, the powder is easy to stick to the inner wall of the furnace, and the residence time is too long, resulting in defective products The second is that the material in contact with the furnace body and the material is easy to introduce harmful metal impurities (Pb, Zn, Cu, Fe, etc.), causing self-discharge and potential safety hazards of lithium batteries

Since the push plate furnace or the roller furnace is static sintering, the products produced are easy to agglomerate, and must be coarsely crushed before entering the fine crushing process; in addition, most of the traditional processes are manually operated, with a low degree of automation

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