A kind of silicon carbon negative electrode material and preparation method thereof
A technology of negative electrode materials and carbon materials, which is applied in the field of silicon-carbon negative electrode materials and its preparation, can solve the problems of poor battery cycle performance, battery capacity attenuation, and poor rate performance, and achieve stable cycle performance, increased surface area, and good rate performance Effect
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Embodiment 1
[0028] Prepare a silicon carbon negative electrode material, the steps are as follows:
[0029] Step 1, the particle diameter D of 50 mass parts 50 Nano-silicon particles of 100nm, 1 mass part of carboxymethyl cellulose, 5 mass parts of glucose, and 1 mass part of ammonium bicarbonate are dispersed in water to form a slurry, ultrasonically dispersed for 2 hours, then stirred for 2 hours, and magnetically stirred until uniformly dispersed , spray-dried to obtain spherical or spherical particles.
[0030] Step 2, calcining the obtained spherical or quasi-spherical particles in a nitrogen atmosphere at 700°C for 8 hours, and cooling to obtain a sphere or spheroid-like inner core with channels;
[0031] Step 3, after soaking the obtained inner core with dilute hydrochloric acid for 1 hour under stirring, wash it with deionized water until it is neutral, filter it out, and dry it in vacuum; add the filtered inner core to a mixture of ethanol and water with a mass ratio of 5:1 In ...
Embodiment 2
[0037] Step 1, the particle diameter D of 50 mass parts 50Nano-silicon particles of 100nm, 1 mass part of carboxymethyl cellulose, 5 mass parts of carbon nanotubes, and 1 mass part of ammonium bicarbonate were dispersed in water to form a slurry, ultrasonically dispersed for 2 hours, then stirred for 2 hours, and magnetically stirred until Evenly dispersed, spray-dried to obtain spherical or spherical particles.
[0038] Step 2, calcining the obtained spherical or quasi-spherical particles at 500° C. for 3 hours in an argon atmosphere, and cooling to obtain a sphere or spheroid-like core with channels;
[0039] Step 3, soak the obtained inner core with dilute hydrochloric acid for 0.5h under stirring, wash with deionized water until neutral, filter out, and dry in vacuum; add the filtered inner core to a mixture of ethanol and water with a mass ratio of 9:1 In the mixed solution, add ammonia water with a mass content of 30% and stir evenly, add tetraethyl silicate, wherein; t...
Embodiment 3
[0044] Step 1, the particle diameter D of 50 mass parts 50 Nano-silicon particles of 100nm, 1 mass part of carboxymethyl cellulose, 5 mass parts of carbon nanofibers, and 1 mass part of sodium bicarbonate are dispersed in water to form a slurry, ultrasonically dispersed for 2h, then stirred for 2h, and magnetically stirred until Evenly dispersed, spray-dried to obtain spherical or spherical particles.
[0045] Step 2, calcining the obtained spherical or spheroidal particles in a helium atmosphere at 1000°C for 36 hours, and cooling to obtain a sphere or spheroidal core with channels;
[0046] Step 3, soak the obtained inner core with dilute hydrochloric acid for 3 hours under stirring, wash it with deionized water until neutral, filter it out, and dry it in vacuum; add the filtered inner core to a mixture of ethanol and water with a mass ratio of 1:1 In the solution, add ammonia water with a mass content of 30% and stir evenly, add tetraethyl silicate, wherein; the mass ratio...
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Abstract
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