Sagger for sintering lithium transition metal oxides and preparation method thereof
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A technology of lithium transition metals and saggers, applied in the field of lithium transition metal oxide materials, can solve the problems of saggars' easily eroded surfaces, poor strength of saggers, and poor thermal shock resistance, so as to inhibit surface shedding and easily eliminate stress , the effect of reducing energy consumption
Active Publication Date: 2022-06-14
GUANGDONG BRUNP RECYCLING TECH +2
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[0007] In order to solve the problems of poor strength of the sagger, poor thermal shock resistance, easy corrosion of the sagger, and easy peeling off of the surface, the present invention provides a sagger for sintering lithium transition metal oxides and a preparation method thereof. The obtained sagger has good corrosion resistance and a small coefficient of thermal expansion. When the positive electrode material contacts the sagger, it is not easy to crack, peel, slag and other corrosion phenomena, thereby improving the service life of the sagger. At the same time, it is used in the sagger. The surface layer is coated with another material, the operation process is relatively simple, and the cost of use is reduced
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Embodiment 1
[0042] A preparation method for lithium transition metal oxide sintering sagger, comprising the following steps:
[0043] (1) 100 parts of raw materials for the base layer, prepare 70 parts of high-purity silicon carbide powder, 5 parts of magnesia-aluminum spinel, 10 parts of alumina-magnesium oxide-yttrium oxide composite fiber and 5 parts of zircon powder, and then add the matrix Silica-alumina sol with 10% of the total mass of the layer raw materials is used as a binder;
[0044] (2) The base layer raw material in step (1) is mixed and pulped with deionized water as a medium, and the amount of deionized water is 6% of the total mass of the base layer raw material. After the mixed slurry is evenly stirred, it is aged for 15 hours, and then Press the slurry through the molding equipment to obtain the primary green body;
[0045] (3) 100 parts of the total shallow layer raw materials, prepare 50 parts of high-purity silicon carbide powder, 20 parts of magnesia-aluminum spine...
Embodiment 2
[0050] A preparation method for lithium transition metal oxide sintering sagger, comprising the following steps:
[0051] (1) 100 parts of raw materials for the base layer, prepare 65 parts of high-purity silicon carbide powder, 10 parts of magnesia-aluminum spinel, 15 parts of alumina-magnesium oxide-yttrium oxide composite fiber and 5 parts of zircon powder, and then add the base Silica-alumina sol with 5% of the total mass of the layer raw materials is used as a binder;
[0052] (2) The base layer raw materials of step (1) are mixed and pulped with deionized water as a medium, and the amount of deionized water is 10% of the total mass of the base layer raw materials. After the mixed slurry is evenly stirred, it is aged for 15 hours, and then Press the slurry through the molding equipment to obtain the primary green body;
[0053] (3) 100 parts of the total raw materials for the shallow layer, prepare 40 parts of high-purity silicon carbide powder, 20 parts of magnesia-alum...
Embodiment 3
[0058] The steps of Example 3 are the same as those of Example 1, except that the binding agent used in Example 3 is polyether-modified polydimethylsilane.
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Abstract
The invention belongs to the technical field of lithium transition metal oxide materials, and provides a sagger for sintering lithium transition metal oxides and a preparation method thereof. The sagger includes a base layer, a shallow layer on the surface of the base layer, and a coating layer , the matrix layer includes the following raw materials: silicon carbide, magnesia-alumina spinel, alumina-magnesia-yttria composite fiber, zircon powder and binder, and the shallow layer includes the following raw materials: silicon carbide, magnesia-alumina spinel, oxide Aluminum-titania composite fiber, yttria-zirconia composite fiber and binder, the coating layer includes the following raw materials: silicon carbide, magnesium aluminum spinel, magnesia, fiber zirconia, lithium transition metal oxide powder and binder . The sagger of the invention has good corrosion resistance and small coefficient of thermal expansion, and the positive electrode material is not easy to crack, peel, slag and other corrosion phenomena when contacting the sagger, thereby improving the service life of the sagger.
Description
technical field [0001] The invention relates to the technical field of lithium transition metal oxide materials, in particular to a saggar for sintering lithium transition metal oxides and a preparation method thereof. Background technique [0002] Lithium transition metal oxide materials include lithium cobalt oxide, lithium nickel oxide, lithium manganate, lithium iron phosphate, lithium nickel cobalt manganate, etc. and their corresponding modified materials. Lithium transition metal oxide materials are used as cathode materials for lithium batteries. At present, high-temperature solid-phase synthesis is generally used in industry, and the high-temperature saggars used in the synthesis process are generally cordierite, mullite, quartz, and magnesium-aluminum tips. High temperature resistant saggars composed of spar, corundum, zircon, etc., of which cordierite, mullite, and magnesia-aluminum spinel are used more. However, in the process of synthesizing the cathode materia...
Claims
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