Double-layer structure sagger for lithium battery positive electrode material and preparation method of double-layer structure sagger

Abstract

The invention relates to the technical field of sagger kiln furniture preparation, and provides a double-layer structure sagger for a lithium battery positive electrode material and a preparation method of the double-layer structure sagger. The double-layer structure sagger for the lithium battery positive electrode material comprises a base body layer and a surface coating. The preparation method of the double-layer structure sagger for the lithium battery positive electrode material comprises the steps of premixing aggregate, processing and forming, mixing and pulping a surface coating, drying, sintering at high temperature and the like. The sagger with the double-layer structure for the positive electrode material of the lithium battery, which is prepared by adopting the method, has good corrosion resistance of resisting erosion of Li<+>, Co<2+> and the like, is high in cycle use frequency, long in service life, relatively small in thermal expansion coefficient, excellent in thermal shock resistance and certain in bearing strength, the positive electrode material is easy to peel off when being in contact with the sagger, the sagger is not peeled off in the use process, no slag falling and no pollution is generated, the product is an ideal improved product of the current cordierite-mullite sagger, is suitable for the sintering process of various lithium battery cathode materials, and is beneficial to reducing the production cost and improving the economic benefit.

Description

technical field [0001] The invention relates to the technical field of sagger kiln furniture preparation, in particular to a sagger for positive electrode materials of lithium batteries and a preparation method thereof. Background technique [0002] The sagger is made of refractory mud and other materials after high-temperature roasting. It is one of the important kiln furniture for firing lithium battery cathode materials. All kinds of lithium battery positive electrode materials must be loaded into the sagger before being loaded into the high-temperature kiln for roasting. At present, compared with foreign products of the same type, domestic saggers still have a large gap in terms of cycle life, corrosion resistance, thermal shock stability, and material bearing strength. If the above-mentioned saggers are directly used for production, the The cost of replacing the saggar is enormous, and it also causes great harm to the environment. [0003] According to the actual indu...

AI Technical Summary

Problems solved by technology

However, because the raw materials used in the synthesis of lithium-ion cathode materials will have a great erosive effect on the sagger during the high-temperature synthesis process, and the sagger material is in the cycle of rapid cooling after repeated high temperatures, the sagger is prone to cracks, and the thermal shock is stable. performance is damaged, the service life will be greatly reduced

[0005] (2) Poor erosion resistance

[0006] (3) Poor thermal shock stability

During the use of the sagger material, because the sagger material is a heterogeneous brittle material, the thermal expansion is relatively large, the thermal conductivity and elastic modulus are relatively small, and the ability to resist thermal stress is relatively poor, resulting in its thermal shock stability. poor

Rapid changes in ambient temperature can easily lead to cracks, peeling or even cracking of the sagger, affecting industrial production

[0007] (4) Low strength of saggar material

[0008] (5) The surface of the sagger is peeled and slag falls off, which is easy to contaminate the product

During the use of the sagger, during the synthesis of Li and Co positive electrode materials, the lithium-containing compound erodes the sagger before the cobalt-containing compound, forming a composite compound and precipitated from it, resulting in peeling and polluting the product