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A high-cycle special ceramic crucible for lithium batteries and its preparation method
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A special ceramic, high-cycle technology, applied in applications, clay products, household appliances, etc., can solve the problems of unknown service life data, short service life, low thermal expansion coefficient of ceramics, etc., to solve side and bottom cracks and long service life , the effect of high volume density
Active Publication Date: 2021-07-02
湖南德景源科技有限公司
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Problems solved by technology
The existing crucible materials mainly have the following problems: (1) short service life
CN102491773A discloses a high-crystal mullite-cordierite high-temperature industrial ceramics and its production method. The raw materials include main crystal phase materials and combined composite matrix materials, and an appropriate amount of composite microcrystalline nucleating agents. The roasting process includes two-stage constant temperature Firing method and two-stage composite crystallization synthesis reaction, the refractory product of this invention has the advantages of excellent oxidation resistance, high refractoriness, high service temperature and low thermal expansion coefficient, but the service life data of the ceramics of this invention is unknown
CN103311498A discloses a calcined crucible and a preparation method thereof. The preparation method is to firstly mix mullite, cordierite, alumina, corundum, kaolin, active magnesia, spodumene and a binder and press them into a green body, and then Zirconia, spodumene, ceriumoxide, corundum and binder are mixed evenly, and the mixture is evenly distributed on the surface of the green body, and pressed again by equipment to obtain a semi-finished crucible, and finally the semi-finished crucible is dried and then fired. The use of the ceramics of this invention Lifespan data is also unknown
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Embodiment 1
[0055] This embodiment provides six surface working layer materials A1-F1 and corresponding six substrate layer materials A2-F2, the specific formulations of which are shown in Table 1.
[0056] Table 1 Formulas of six surface working layer materials from A1 to F1
[0057]
[0058] Table 2 Formulas of six substrate layer materials from A2 to F2
[0059]
[0060]
Embodiment 2
[0062] This example provides a method for preparing a high-cycle special ceramic crucible for lithium batteries. The process flow is as follows: figure 1 As shown, it specifically includes the following steps:
[0063] (1) Weigh the raw materials of the surface working layer according to the proportion, dissolve yellow dextrin in water, mix kaolin, white corundum, alumina micropowder, fused mullite, spodumene powder and cordierite, add the pre-dissolved Yellow dextrin solution mixed;
[0064] (2) Weigh the raw materials of the matrix layer according to the proportion, dissolve yellow dextrin in water, mix sintered mullite, kaolin, alumina micropowder, magnesium carbonate, cordierite, talc, fused magnesium aluminum spinel and andalusite Then add the pre-dissolved yellow dextrin solution and mix evenly;
[0065] (3) Add the surface working layer material prepared in step (1) to the bottom of the mold, and press to obtain the surface working layer;
[0066] (4) uniformly cover...
Embodiment 3
[0070] Using the six formulas provided in Example 1 and the method provided in Example 2, six corresponding high-cycle special ceramic crucibles A to F for lithium batteries are prepared. Before step (3) is pressed, steps (1) and (2) ) The prepared surface working layer material and base layer material are placed in a sealed container for trapping, and the standing time is greater than 24h. Steps (3) and (4) are pressed using a fully automatic crucible hydraulic forming machine, and the tonnage of the hydraulic machine is ≥ 500T. The drying temperature in step (5) is 75°C, the drying time is more than 12h, the firing time is 35h, and the temperature is 1350°C. The normal temperature compressive strength and service life of the crucible are shown in Table 3.
[0071] Table 3 The normal temperature compressive strength and service life of the crucible
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Abstract
The invention provides a special high cycle special ceramiccrucible for lithium batteries, the crucible includes a surface working layer and a matrix layer, and the raw materials of the surface working layer include kaolin, white corundum, alumina micropowder, fused mullite, binder, spodumene Stone powder, cordierite and water, the base layer raw materials include sintered mullite, kaolin, alumina micropowder, magnesiumcarbonate, cordierite, talc, fused magnesium aluminum spinel, andalusite, binding agent and water, the present invention also A preparation method for the above crucible is provided. The surface working layer material of the crucible of the present invention adopts fine particles of corrosion-resistant materials as the main material, and the base layer material adopts materials with a small thermal expansion coefficient and high temperature resistance as the main material, which slows down the time for peeling and sticking materials at the bottom, and solves the cracking of the side and the bottom Phenomenon, the crucible body has a certain strength, and the body is dried and then put into the kiln for sintering. The flatness of the bottom of the crucible after firing is better than that of other kilns, which can meet the needs of users in the production of fully automatedassembly line production mode. .
Description
technical field [0001] The invention relates to the technical field of lithium battery materials, and specifically relates to a high-cycle special ceramic crucible for lithium batteries and a preparation method thereof. Background technique [0002] Lithium battery cathode materials must be fired in a high-temperature kiln, and the firing process must be loaded in a crucible. [0003] Crucible materials used in my country are roughly divided into five categories in terms of materials: silicon-aluminum crucibles, silicon-aluminum-magnesium crucibles, semi-silicon crucibles, clay-fused silica crucibles and silicon carbide crucibles. The crucible material used for the production of lithium-ion battery cathode materials is mainly mullite or mullite-cordierite and corundum mullite. At present, in the actual production of synthetic lithium-ion battery cathode materials, high-temperature solid-phase synthesis is generally used. The high-temperature solid-phase synthesis process is...
Claims
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