Forming method of sagger for lithium battery cathode material

Abstract

The invention relates to the technical field of preparation of sagger kiln furniture, and particularly relates to a forming method of a sagger for a lithium battery cathode material. The forming method comprises the following steps of powder pretreatment, die filling and prepressing, drying, die filling and forming, wherein the forming specifically comprises the following steps of putting an elastic die which is tightly coated with a semi-finished sagger blank and is sealed into a high-pressure cylinder, and suspending the elastic die in the high-pressure cylinder by using a high-pressure-resistant rope; covering a high-pressure cylinder sealing cover; and continuously injecting liquid between the inside of the high-pressure cylinder and the elastic die for pressurization, when the internal pressure reaches 5,000kgf / cm <2>, maintaining the pressure for 12 hours, discharging the liquid, slowly releasing the pressure, taking out the sagger blank after the pressure is released, opening the sagger blank, and removing the elastic die to obtain a finished sagger blank. The sagger blank obtained by pressing by the method has the advantages of uniform tissue structure, high density, low sintering shrinkage and low die cost; and the method has high production efficiency, can be used for forming slender products with complex shapes, large-size products and precise-size products, and is suitable for automatic operation.

Description

technical field [0001] The invention relates to the technical field of sagger kiln furniture preparation, in particular to a method for forming a sagger used as a positive electrode material of a lithium battery. Background technique [0002] The saggers used in the synthesis of cathode materials for lithium-ion batteries are generally high-temperature-resistant saggers made of corundum, mullite, quartz, and cordierite. Among them, cordierite and corundum saggars are the most used. However, due to the fact that the raw materials used in the synthesis of lithium-ion positive electrode materials will decompose during the synthesis process to produce lithium oxide with strong penetration and reactivity, which will corrode the high-temperature resistant saggar. On the other hand, when the saggar material is rapidly cooled after high temperature, the As the number of times increases, the saggar is prone to cracks, the thermal shock stability of the saggar is damaged, and the ser...

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Problems solved by technology

However, the two have relatively high requirements on the particle size of the material, and the particle size of the material particles should not be too large, and the green body prepared by the two methods has the following disadvantages: the shrinkage rate is large, and the thermal stability is reduced; the green body has a relatively high density. low, affecting the high-temperature mechanical strength of the green body; in addition, although slip casting can be applied to various shapes of green bodies, it is not suitable for automatic production, and the production efficiency is low; although extrusion molding is more suitable for automatic production, the production efficiency is also low. High, but only suitable for the production of tubular bodies, and the shape of the sagger used for the positive electrode material of lithium-ion batteries is usually a square block