Sagger for sintering lithium composite transition metal oxide and preparation method thereof

A sagger for sintering lithium composite transition metal oxide, wherein the sagger includes a substrate layer and a shallow layer on a surface of the substrate layer, and a coating layer;

• the substrate layer is prepared from the following raw materials:
• silicon carbide, magnesia-alumina spinel, aluminum oxide-magnesium oxide-yttrium oxide composite fiber, zircon powder and a binding agent;
• the shallow layer is prepared from the following raw materials:
• silicon carbide, magnesia-alumina spinel, aluminum oxide-titanium oxide composite fiber, yttrium oxide-zirconium oxide composite fiber and a binding agent;
• and
• the coating layer is prepared from the following raw materials:
• silicon carbide, magnesia-alumina spinel, magnesium oxide, zirconium oxide fiber, lithium composite transition metal oxide powder and a binding agent;
• wherein, the substrate layer is prepared from the following raw materials in parts by weight:
• 40-85 parts of silicon carbide, 2-10 parts of magnesia-alumina spinel, 5-15 parts of aluminum oxide-magnesium oxide-yttrium oxide composite fiber, 5-10 parts of zircon powder and 2-10 parts of the binding agent;
• the shallow layer is prepared from the following raw materials in parts by weight:
• 30-50 parts of silicon carbide, 10-30 parts of magnesia-alumina spinel, 5-20 parts of aluminum oxide-titanium oxide composite fiber, 5-20 parts of yttrium oxide-zirconium oxide composite fiber and 5-10 parts of the binding agent;
• and the coating layer is prepared from the following raw materials in parts by weight:
• 5-20 parts of silicon carbide, 5-20 parts of magnesia-alumina spinel, 6-10 parts of magnesium oxide, 3-10 parts of zirconium oxide fiber, 5-25 parts of lithium composite transition metal oxide powder and 10-20 parts of the binding agent;
• and the binding agent is at least one selected from a group consisting of dextrin, polyvinyl alcohol, polyether modified polydimethylsilane, and silica alumina sol.