Graphite carbon based saggar

Abstract

The invention discloses a graphitic carbon-based saggar, which relates to the technical field of saggar production, including a substrate and a coating on the surface of the substrate. Powder, the binder of 10-15 parts by weight; the coating layer includes the following raw materials by weight: 60-75 parts by weight of silicon carbide micropowder, 2-6 parts by weight of filler, 3-6 parts by weight of carbon powder. The coating prepared by the invention forms a transition connection layer rich in silicon carbide under high temperature conditions, the coating has a gradient of the silicon carbide concentration gradually increasing from the outside to the inside, a good bonding state is formed between the coating and the substrate, and the saggar is endowed with excellent Thermal shock resistance, the coating is not easy to be peeled off by thermal shock, ensuring the continuity and effectiveness of the anti-oxidative protection of the coating on the substrate.

Description

technical field [0001] The invention relates to the technical field of saggar production, in particular to a graphite carbon-based saggar. Background technique [0002] With the increasing popularity of electronic mobile devices. With the continuous promotion of new energy vehicles, the requirements for energy storage equipment are getting higher and higher. The application market of lithium batteries continues to expand, and the electrode materials of lithium ion batteries play an important role in the performance of lithium batteries. In the preparation process of the cathode material of lithium ion battery, the saggar serves as a container for the cathode material, which has an important influence on the performance of the cathode material. The saggers for lithium-ion cathode firing usually use mullite, cordierite and magnesia-aluminum spinel as the main raw materials, which have high refractory properties, good mechanical properties and shock resistance, and have a sma...

AI Technical Summary

Problems solved by technology

[0003] The cordierite sagger prepared by the traditional process has many disadvantages, such as the high porosity of the cordierite sagger, the low mention density and the high content of internal impurities, which are easy to chemically react with the active material in the lithium battery at high temperature, resulting in the It is easy to be corroded, which will lead to the contamination of lithium battery electrode materials and affect the physical and chemical properties of positive electrode materials

Graphite has the advantages of high temperature resistance and high chemical stability, and is often used as a sintered container for lithium battery motor materials. However, graphite is easily oxidized at around 400 ° C, resulting in the destruction of the carbon composite material structure, which restricts its use in high temperature oxidation environments.

In the prior art, a silicon carbide coating is often sprayed on the surface of the substrate to endow the material with good oxidation resistance, but the mismatch between the thermal expansion coefficient of the substrate and the coating causes the coating to crack and fall off easily, which limits the oxidation resistance of silicon oxide.

Images