Preparation tank, preparation furnace and preparation method of battery silicon-based negative electrode material
A technology of negative electrode material and preparation tank, which is applied to silicon oxide and other directions, can solve the problems of difficult preparation, high temperature, harsh conditions of supporting facilities, etc., and achieve the effect of preparing finished products with high quality and low cost.
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[0050] A method for preparing a silicon-based negative electrode material for a battery, the method is a method for preparing a silicon-based negative electrode material in a kiln for preparing a silicon-based negative electrode material for a battery; the basic principle of the preparation reaction is: SiO 2 + Si → 2SiO, the reaction process is carried out in a closed high-temperature vacuum environment (temperature 1200 ° C ~ 1400 ° C, vacuum 1 Pa ~ 5 Pa). The steps of the method include:
[0051] a. Grinding the raw materials, including SiO 2 and Si, SiO 2 The molar ratio to Si is 1:1, and the particle size grade of raw materials after grinding is higher than 100 mesh;
[0052] B. fully mix the raw materials processed by step a, and press the mixed raw materials into the shape of apricot stone;
[0053] c. Heating the preparation kiln, alternately burning two corresponding burners on the two side walls of the preparation kiln, so that the temperature of the flue gas d...
Embodiment 1
[0065] Such as figure 1 , a battery silicon-based negative electrode material preparation tank 100, including a heating tank body 110, an operating tank body 120 arranged above the heating tank body, a slag discharge port 130 arranged under the heating tank body, a core tube 140, crystallization Device 150, crystal cooling water jacket 160.
[0066] The heating tank is required to work at a high temperature of 1200°C to 1400°C and a vacuum of 1Pa to 5Pa. The heating tank is centrifugally cast from heat-resistant steel with rare earth elements added. The material of the heating tank body in this embodiment is Gr25Ni20 heat-resistant steel, cerium or lanthanum with a total content of not more than 0.01% is added to the material of the heating tank body, and heat-resistant steel containing rare earth elements is used as the material of the heating tank body. It can prevent the high-temperature creep of the heating tank body, and the heating tank body can work at a high temperatu...
Embodiment 2
[0073] Such as Figure 2 to Figure 7 , a battery silicon-based negative electrode material preparation furnace 200, the preparation furnace is a furnace for preparing silicon-based negative electrode materials using the battery silicon-based negative electrode material preparation tank 100 of Embodiment 1.
[0074] The production layout structure of the preparation furnace combined with the vertical preparation tank is divided into three-layer areas in the vertical direction of the furnace body according to the function of the production process operation. The middle area is the combustion control area; the upper area is the process operation area such as loading and unloading and vacuum cooling; the lower area is the slag unloading and cleaning area. Each area is an independent space but can be connected to each other, making the production operation easier and more convenient.
[0075]The preparation kiln is provided with a cuboid hearth 220 . The body structure of the pre...
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