Recycling method of silicon particles and preparation method of secondary battery cathode material
A cathode material and secondary battery technology, applied in the direction of battery electrodes, lithium batteries, chemical instruments and methods, etc., can solve the problems of large volume change, low life characteristics, use restrictions, etc., and achieve high charge and discharge capacity and high recovery rate And the effect of excellent purity and cycle characteristics
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[0039] According to a specific example of the method for preparing cathode materials for secondary batteries of the present invention, the method may include the following steps: ultrasonically treating the suspension of waste silicon slag to separate silicon carbide and silicon particles from the monomers, A step of forming a colloidal silica solution on the upper surface of the solution, thereby spraying the colloidal silica solution as a first droplet; drying the first droplet, thereby preparing a silicon aggregate; preparing a silicon aggregate containing, graphene oxide and a step of preparing a mixed solution of a dispersion medium; and a step of using the mixed solution as a second droplet for spraying, drying and heat treatment, thereby preparing a silicon aggregate-graphene composite.
[0040] The secondary battery cathode material prepared by this method can have high charge and discharge capacity, and its cycle characteristics are excellent.
[0041] Specifically, w...
Embodiment 1
[0121] 1 g of dried silicon waste slag from which metal impurities were removed was dispersed in 199 ml of distilled water to prepare a silicon waste slag suspension.
[0122] Afterwards, use an ultrasonic nebulizer (UN-511, Alfesa Pharm Co.) with an ultrasonic output rate of 1.7MHz, and use ultrasonic treatment for 30 minutes to separate silicon carbide and silicon particles, form a colloidal silica solution, and contain silicon The droplets of particles are sprayed.
[0123] Argon gas with a flow rate of 1L / min was used to transport the sprayed droplets to a heating furnace at a temperature of 300°C. At a set temperature, distilled water as a dispersion medium was evaporated to obtain silicon aggregates.
Embodiment 2 to 4
[0125] Except that some conditions were changed as shown in Table 1, the rest of the steps were carried out in the same manner as in Example 1.
[0126] 【Table 1】
[0127]
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