Multi-core core-shell-structure silicon carbon composite negative pole material and preparation method thereof
A technology of negative electrode material and core-shell structure, which is applied in the field of lithium-ion battery composite negative electrode materials and its preparation, can solve the problems of electrode cycle performance degradation, limited commercial application, and material structure damage, and solve the problem of poor silicon conductivity and improve Capacity utilization rate and effect of improving tap density
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[0032] Example 1
[0033] (1) High-dispersion multi-nuclear porous ball: add thermosetting phenolic resin (added according to the pyrolytic carbon content of the spherical core material after sintering is 5wt%) into an appropriate amount of detetrahydrofuran, magnetically stir to form a solution with a certain viscosity, and then Add silicon powder (based on the silicon / carbon mass ratio of the sintered spherical core material at 1:19) and natural graphite (based on 80% of the total mass of the sintered spherical composite material), then add 10wt% polyethylene glycol dispersant, ball mill 5h, ultrasonic and mechanical stirring and dispersion for 1h, after spray drying the uniformly dispersed suspension at 120~200℃, it is the precursor of polynuclear porous sphere. The obtained powder is transferred to a protective atmosphere at 500°C for 2 hours and cooled with the furnace to form a multi-nuclear porous ball.
[0034] (2) Preparation of high-dispersion pitch suspension: pre-crush...
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[0037] Example 2
[0038] (1) High-dispersion multi-nuclear porous ball: Add polyvinyl alcohol-124 (added according to 15wt.% of pyrolysis carbon content in the sintered composite material) into an appropriate amount of deionized water, and magnetically stir to form a solution with a certain viscosity , And then add nano silicon powder (Nano-Si, according to the mass ratio of silicon / carbon in the spherical core material after sintering 1:10) and natural graphite (according to 50wt.% of the total mass of the spherical composite material after sintering, and then add 10wt.% Propylene glycol dispersant, ultrasonic and mechanical stirring and dispersion for 1 hour. After spray-drying the uniformly dispersed suspension at 170~200℃, it is the precursor of polynuclear porous spheres. The resulting powder is transferred to a protective atmosphere at 1000℃ for 2h, and the furnace Cooling, that is, multi-core porous ball.
[0039] (2) Preparation of high-dispersion asphalt suspension: pre-...
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[0042] Example 3
[0043] (1) High-dispersion multi-nuclear porous ball: Add urea-formaldehyde resin (added according to the pyrolysis carbon content of the spherical core material after sintering is 10wt.%) into an appropriate amount of deionized water, magnetically stir to form a solution with a certain viscosity, and then Add nano silicon powder and silicon oxide (Si:SiO=1:1, according to the mass ratio of silicon / carbon in the spherical core material after sintering 2:5) and natural graphite (according to 40wt.% of the total mass of the spherical composite material after sintering), Then add 1wt.% of polyvinyl acetate dispersant, ball mill for 1h, ultrasonic and mechanical stirring and dispersion for 1h, and spray-dry the uniformly dispersed suspension at 170~200℃ to form a polynuclear porous ball precursor. The obtained powder is transferred to a protective atmosphere at 500°C for 5 hours and cooled with the furnace to form a multi-nuclear porous ball.
[0044] (2) Preparatio...
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