Sagger for sintering positive electrode material of lithium battery based on magnesium aluminate spinel sol and preparation method of sagger

Abstract

The invention relates to a sagger for sintering a positive electrode material of a lithium battery based on magnesium aluminate spinel sol and a preparation method of the sagger. According to the technical scheme, the preparation method comprises the steps of mixing and stirring the following components of, by weight, 20%-25% of magnesium nitrate, 15%-20% of aluminum nitrate and 60%-61% of industrial alcohol to obtain magnesium aluminate spinel sol; mixing the following components of, by weight, 25%-30% of mullite, 25%-30% of cordierite. 25%-30% of andalusite, 3%-7% of the magnesium aluminatespinel sol, 4%-7% of Guangxi white mud and 2%-7% of silicon micro powder to obtain a mixture; carrying out mechanical pressing on the mixture, drying the mixture at the temperature of 90-110 DEG C, and then carrying out heat preservation at the temperature of 1,300-1,400 DEG C for 3-4 hours to obtain the sagger for sintering the positive electrode material of the lithium battery based on the magnesium aluminate spinel sol. The preparation method has the characteristics of simple process, short production period, easy industrial production and high yield; and the prepared sagger is high in strength, long in service life, and good in thermal shock resistance and corrosion resistance.

Description

technical field [0001] The invention belongs to the technical field of saggers for sintering positive electrode materials of lithium batteries. In particular, it relates to a magnesium-aluminum spinel sol-based sagger for sintering positive electrode materials of lithium batteries and a preparation method thereof. Background technique [0002] Lithium batteries are mainly composed of positive electrode, negative electrode, electrolyte and diaphragm, among which the cost of positive electrode materials accounts for a large proportion. Lithium battery positive electrode materials are made of liquid lithium carbonate and cobalt carbonate fired in different temperature systems in saggers. Existing saggers Mainly due to the erosion of lithium carbonate and cobalt carbonate, the contact surface is crusted and cannot be used any more. Saggers are non-recyclable products and are disposable after use. Therefore, increasing the service life of saggers is of great significance for env...

AI Technical Summary

Problems solved by technology

[0003] "A cristobalite-mullite composite material and its preparation method" (CN1459430A) patented technology, which uses bauxite, coal gangue and absolute ethanol as raw materials and is fired at high temperature, although it has a relatively low cost And high added value, but because the phases formed in the material are easy to react with the positive electrode material of lithium battery, resulting in poor corrosion resistance and short service life of the material

[0004] "A sintered sagger for new energy automotive electronic ceramics and its manufacturing method" (CN106630977A) patented technology, which uses corundum sand, kaolin, sodium humate and zirconia as raw materials, and is fired at high temperature after dry pressing , although it has high strength, but due to the single phase, the thermal shock performance of the material is low

[0005] "A raw material formula for producing saggers" (CN1240775A) patented technology, the technology uses ground stone, burnt gemstone, purple mother festival, Inner Mongolia soil, quartz glass, fossil powder and raw stone powder as raw materials, and the raw materials are mixed and ground by a ball mill. The composition is uniform, but too many impurities lead to a high amount of liquid phase, which makes the strength of the material low