Roasting sagger for circulating type lithium battery anode material and preparation method thereof

Abstract

The invention discloses and provides a roasting sagger for a circulating type lithium battery anode material, which is simple in manufacturing process and structure, does not easily react with a lithium battery material, can avoid polluting the lithium battery material, does not pollute the environment and can be recycled, and a preparation method thereof. The preparation method of the roasting sagger for the circulating type lithium battery anode material comprises the following steps of: (1) uniformly mixing mullite, cordierite, aluminum oxide, corundum, kaolin, active magnesium oxide, spodumene and a bonding agent; adding the materials into a metal mould according to the weight; and pressing and molding a blank by pressing and molding equipment; (2) uniformly mixing zirconium oxide, the spodumene, cerium oxide, the corundum and the bonding agent; uniformly distributing the materials on the surface of the blank by a material distribution machine or manpower and pressing again by the pressing and molding equipment to obtain a semi-finished sagger product; and (3) drying the sagger semi-finished product and sintering. The roasting sagger disclosed by the invention can be widely applied to the field of the sagger for the lithium battery anode material.

Description

technical field [0001] The invention relates to a roasting sagger for a circulating lithium battery cathode material and a preparation method thereof. Background technique [0002] At present, lithium battery cathode materials are calcined at high temperature by using saggers to carry materials. Generally, saggers are used to carry lithium carbonate and metal oxides (manganese, cobalt, nickel, etc.) for high-temperature reaction. Li 2 O has a certain chemical reaction with the acidic oxide silica and amphoteric oxide aluminum oxide in the surface layer of the sagger to produce a glassy substance, the main components of which are (LiAlO 2、 Li 2 OSoO 2 , Li 4 SiO 4 , LiAlSiO 4、 (LiCoO 2 ).RR, Li 2 4Mg 0.8 SiO 4 etc.), the average index of sagger consumption at home and abroad is 200-300 kg per ton of positive electrode materials. In 2011 alone, more than 34,000 tons of saggers were consumed in the production of positive electrode materials for lithium batteries in C...

AI Technical Summary

Problems solved by technology

[0002] At present, lithium battery cathode materials are calcined at high temperature by using saggers to carry materials. Generally, saggers are used to carry lithium carbonate and metal oxides (manganese, cobalt, nickel, etc.) for high-temperature reaction. Li 2 O has a certain chemical reaction with the acidic oxide silica and amphoteric oxide aluminum oxide in the surface layer of the sagger to produce a glassy substance, the main components of which are (LiAlO 2、 Li 2 OSoO 2 , Li 4 SiO 4 , LiAlSiO 4、 (LiCoO 2 ).RR, Li 2 4Mg 0.8 SiO 4 etc.), the average index of sagger consumption at home and abroad is 200-300 kg per ton of positive electrode materials. In 2011 alone, more than 34,000 tons of saggers were consumed in the production of positive electrode materials for lithium batteries in China. Saggers are reused by cold and hot. Generally, it will be scrapped after 20-30 times of use

Existing saggers generally have two structures, one is made of a composite material with a single structure, but this kind of sagger will be infiltrated and polluted by the positive electrode material of the lithium battery after use, resulting in a small amount of dust on the surface of the sagger The positive electrode material cannot be cleaned up and can only be buried. In this way, the discarded sagger becomes industrial waste. Once buried underground, it will inevitably cause heavy metal pollution, while the other is divided into two layers. structure, that is, spraying on the surface of the substrate layer, but after this structure is used for a certain number of times, the physical and chemical properties of the sprayed layer on the surface of the sagger and the substrate will change, and the surface of the sagger will start to peel off, which will not only pollute the positive electrode material It is relatively low, and it is easy to cause safety accidents of subsequent lithium batteries