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Sagger and preparation method thereof

A saggar and mullite technology, applied in the field of saggar and its preparation, can solve the problems of the change of thermal expansion coefficient of saggar material, the change of local volume, the crack of the eroded surface, etc., so as to improve the thermal shock resistance and prevent the Pollution, the effect of improving the pass rate

Active Publication Date: 2018-07-31
ZHENGZHOU UNIV
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  • Abstract
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  • Application Information

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Problems solved by technology

On the other hand, the chemical reaction between the ternary cathode material and the sagger material at high temperature forms a composite phase, which causes the thermal expansion coefficient of the sagger material to change, and the local volume to change, eventually leading to cracks and peeling off of the eroded surface

Method used

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  • Sagger and preparation method thereof

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preparation example Construction

[0024] see figure 1 , the present invention also provides a kind of preparation method of sagger, comprising the following steps:

[0025] 1) Weigh mullite, corundum, activated α-alumina and synthetic potassium aluminate according to weight percentage, add binder and mix evenly, and then use hydraulic press to form a sagger green body;

[0026] 2) Send the sagger green body obtained after hydraulic press molding into a tunnel-type drying kiln for heat treatment, wherein the inlet temperature of the drying kiln is 40-60°C, the temperature in the heat preservation interval is 110°C, and the outlet temperature is 40-60°C. Heat treatment time is 12-24h;

[0027] 3) Send the dry heat-treated sagger green body into a tunnel kiln, and heat-preserve and calcinate at a temperature of 1200-1400° C. for 5-8 hours.

Embodiment 1

[0029] (1) Weigh fused mullite, corundum, activated α-alumina and synthetic potassium aluminate according to Table 1, add an appropriate amount of water and carboxymethyl cellulose (binder), mix well, and use a hydraulic press to form a box The bowl body, wherein the amount of carboxymethyl cellulose accounts for 3% of the total weight of fused mullite, corundum, activated α-alumina and synthetic potassium aluminate.

[0030] Prepare the required raw material formula of sagger in table 1 embodiment 1

[0031]

[0032] (2) Send the sagger green body obtained by the hydraulic press into the tunnel drying kiln for heat treatment, wherein the inlet temperature of the drying kiln is 50°C, the temperature in the holding interval is 110°C, the outlet temperature is 50°C, and the heat treatment time is 18h.

[0033] (3) Send the dry heat-treated sagger green body into a tunnel kiln, heat-preserve and calcinate at 1300° C. for 5 hours to obtain a sagger.

Embodiment 2

[0035] (1) Weigh fused mullite, corundum, activated α-alumina and synthetic potassium aluminate according to Table 2, add an appropriate amount of water and carboxymethyl cellulose (binder), mix well, and use a hydraulic press to form a box The bowl body, wherein the amount of carboxymethyl cellulose accounts for 3% of the total weight of fused mullite, corundum, activated α-alumina and synthetic potassium aluminate.

[0036] Prepare the required raw material formula of sagger in table 2 embodiment 2

[0037]

[0038]

[0039] (2) Send the sagger green body obtained by the hydraulic press into the tunnel drying kiln for heat treatment, wherein the inlet temperature of the drying kiln is 50°C, the temperature in the holding interval is 110°C, the outlet temperature is 50°C, and the heat treatment time is 18h.

[0040] (3) Send the dry heat-treated sagger green body into a tunnel kiln, heat-preserve and calcinate at 1300° C. for 5 hours to obtain a sagger.

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Abstract

The invention provides a sagger which is prepared from the following raw materials in percentage by weight: 65-87 percent of mullite, 5-10 percent of corundum, 3-7 percent of activated alpha-aluminumoxide and 5-10 percent of synthetic potassium aluminate; and the synthetic potassium aluminate is prepared from the following chemical components in percentage by weight: 92.0-93.0 percent of Al2O3 and 7.0-8.0 percent of K2O. The sagger has stronger thermal shock resistance and erosion resistance and can be used for calcining a ternary anode material. The invention also provides a preparation method of the sagger.

Description

【Technical field】 [0001] The invention belongs to the technical field of refractory materials, and in particular relates to a sagger and a preparation method thereof. 【Background technique】 [0002] Lithium-ion batteries have been widely used because of their energy storage, fast charging and discharging, long cycle life, and environmental friendliness. Cathode materials are one of the key factors determining the performance of lithium-ion batteries, and ternary materials such as nickel-cobalt lithium manganese oxide have become the most promising cathode materials due to their advantages such as high specific capacity and long cycle. In the prior art, the ternary cathode material is usually fired at a temperature of 900-1100°C by using a precursor, and the sagger used to hold the precursor during the calcination process is crucial to the sintering process. [0003] During the process of calcination to prepare the ternary cathode material, the sagger is not only subjected t...

Claims

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Application Information

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IPC IPC(8): C04B35/185C04B35/622F27D5/00
CPCC04B35/185C04B35/622C04B2235/3201C04B2235/3217C04B2235/3222C04B2235/5427C04B2235/5436C04B2235/656F27D5/0012
Inventor 叶国田丁达飞翟鹏涛
Owner ZHENGZHOU UNIV
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