Silicon-carbon composite material and its preparation method, negative electrode, power battery and electric vehicle
A technology of silicon-carbon composite materials and carbon materials, which is applied in the field of materials, can solve the problems of power battery capacity attenuation, silicon-carbon composite material structure damage, and needs to be improved.
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Embodiment 1
[0081] Method for preparing silicon carbon composite material
[0082] Disperse 0.3g of single-walled carbon nanotubes into 500mL of deionized water to form a homogeneous solution; then add 2.0g of nano-silicon particles and 0.5g of oxide solid electrolyte LLZTO to the homogeneous solution, stir well and high-energy Ultrasonic dispersion was carried out for 2 hours to obtain a first dispersion; the first dispersion was spray-dried to obtain a first prefab; and then the first prefab was calcined at 900° C. for 2 hours in an argon atmosphere to obtain Core (for SEM photos see image 3 ).
[0083] Disperse 0.1 g of single-walled carbon nanotubes in 300 mL of deionized water to form a homogeneous solution; then add 2.0 g of the aforementioned core, 0.2 g of oxide solid electrolyte LLZTO to the homogeneous solution, and fully Stir and disperse by high-energy ultrasonic for 2 hours to obtain a second dispersion; spray-dry the second dispersion to obtain a second preform; and then ...
Embodiment 2
[0086] Method for preparing silicon carbon composite material
[0087]Disperse 0.3g of multi-walled carbon nanotubes into 500mL of tetrahydrofuran to form a homogeneous solution; then add 2.0g of nano-silicon particles and 0.5g of oxide solid electrolyte LLZO to the homogeneous solution, stir well and ultrasonically Dispersing for 2 hours to obtain a first dispersion; subjecting the first dispersion to spray drying to obtain a first prefab; and then calcining the first prefab at 900° C. for 2 hours in an argon atmosphere to obtain a nucleus core.
[0088] Disperse 0.1 g of multi-walled carbon nanotubes into 300 mL of tetrahydrofuran to form a homogeneous solution; then add 2.0 g of the aforementioned core and 0.2 g of oxide solid electrolyte LLZO to the homogeneous solution, and stir well And high-energy ultrasonic dispersion for 2 hours to obtain a second dispersion; spray drying the second dispersion to obtain a second prefab; and then calcining the second prefab at 900°C f...
Embodiment 3
[0091] Method for preparing silicon carbon composite material
[0092] Disperse 0.3g of multi-walled carbon nanotubes in 600mL of toluene to form a uniform solution; then add 2.0g of nano-silica particles and 0.5g of sulfide solid electrolyte LGPS to the uniform solution, stir well and High-energy ultrasonic dispersion was performed for 2 hours to obtain a first dispersion; the first dispersion was spray-dried to obtain a first prefab; and the first prefab was calcined at 900°C for 2 hours in an argon atmosphere, get the core.
[0093] Disperse 0.1 g of multi-walled carbon nanotubes into 300 mL of toluene to form a homogeneous solution; then add 2.0 g of the aforementioned core and 0.2 g of sulfide solid state electrolyte LGPS to the homogeneous solution, and stir well. And high-energy ultrasonic dispersion for 2 hours to obtain a second dispersion; spray drying the second dispersion to obtain a second prefab; and then calcining the second prefab at 900°C for 2 hours in an ar...
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