Method for preparing cage-shaped sphere structured silicon-carbon cathode material
A technology of anode material and small balls, which is applied in the field of preparation of silicon-carbon anode materials, can solve problems such as poor performance, and achieve the effects of alleviating volume expansion stress, fast lithium ion and electron diffusion, and good cycle stability
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[0017] The invention discloses a method for preparing a silicon-carbon negative electrode material with a cage-shaped bead structure, which includes the following steps:
[0018] (1) Nano-silicon particles indicate activation: add 0.8-1.2g nano-silicon powder to 0.8-1.5L absolute ethanol to disperse; then add 6-14ml surfactant 3-aminopropyltriethoxysilane (APTES) Ultrasound for 15-25 hours in the silicon powder dispersion system; then, filter and wash with deionized water for 2-5 times to obtain silicon slurry.
[0019] (2) Slurry mixing process: Add the above-mentioned surface-activated silicon slurry into 0.8-1.2L of water, and add 90-110g of citric acid, stir for 1-3h, and sonicate for 1-3h.
[0020] (3) Spray drying and calcination: the above slurry is dried by spray drying equipment to obtain a precursor; then the precursor is put into a tube furnace and calcined for 0.8-2h in an argon atmosphere at 800-1000°C , The heating rate is 1-4°C / min.
Embodiment 1
[0023] A method for preparing a silicon-carbon negative electrode material with a cage-shaped bead structure, comprising the following steps:
[0024] (1) Activated nano-silicon particles: add 1g of nano-silicon powder to 1L of absolute ethanol to disperse; then add 10ml of surfactant 3-aminopropyltriethoxysilane to the dispersion of the silicon powder, and ultrasonicate for 20h; then, Filter and wash with deionized water 3 times to obtain silicon slurry.
[0025] (2) Slurry mixing process: Add the above-mentioned surface-activated silicon slurry into 1L of water, and add 100g of citric acid, stir for 2h, and sonicate for 2h.
[0026] (3) Spray drying and calcination: the above slurry was dried by spray drying equipment to obtain the precursor; then the precursor was put into a tube furnace and calcined for 1 hour in an argon atmosphere at 900°C, with a heating rate of 3°C / min.
[0027] Such as figure 1 Shown, is the scanning electron microscope picture that obtains silicon...
Embodiment 2
[0030] A method for preparing a silicon-carbon negative electrode material with a cage-shaped bead structure, comprising the following steps:
[0031] (1) Activated nano-silicon particles: add 0.8g of nano-silicon powder to 0.9L of absolute ethanol to disperse; then add 7ml of surfactant 3-aminopropyltriethoxysilane to the dispersion of silicon powder, and sonicate for 16h; Then, it was suction-filtered and washed twice with deionized water to obtain a silicon slurry.
[0032] (2) Slurry mixing process: Add the above-mentioned surface-activated silicon slurry into 0.8L of water, and add 90g of citric acid, stir for 1h, and sonicate for 2.1h.
[0033] (3) Spray drying and calcination: The above slurry is dried by spray drying equipment to obtain the precursor; then the precursor is put into a tube furnace and calcined in an argon atmosphere at 800°C for 0.8h, and the heating rate is 1°C / min.
[0034] After testing, the silicon carbon obtained in this example has an initial di...
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