Silicon carbon material and preparation method thereof
A technology of silicon carbon materials and composite materials, applied in the direction of structural parts, electrical components, battery electrodes, etc., can solve problems such as unfavorable electron transport, improve lithium battery capacity, disadvantages, etc., and achieve high electrochemical capacity, high absorbable stress, Simple preparation method
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[0040] According to one aspect of the present invention, a method for preparing a silicon carbon material, the preparation method includes the following steps:
[0041] First, dissolve the organic salt in a solvent to prepare a mesoporous carbon precursor solution, then add nano-silicon to the precursor solution and mix well, and obtain a composite material of nano-silicon and mesoporous carbon by drying and sintering; Then, a layer of carbon shell is coated on the composite material of nano-silicon and mesoporous carbon by drying and sintering again to obtain a silicon-carbon material.
[0042] The preparation method of the silicon-carbon material provided by the present invention firstly dissolves the organic salt in a solvent to obtain a mesoporous carbon precursor solution, then adds nano-silicon into the precursor solution and mixes them evenly, and obtains the nano-carbon by drying and sintering. A composite material of silicon and mesoporous carbon; then, a carbon shell...
Embodiment 1
[0077] A method for preparing a silicon-carbon material, the method comprising the following steps:
[0078] (a), weigh 40g of ferric citrate, stir and dissolve in 100mL of 60°C water to obtain a solution;
[0079] (b), adding 13.5g of nano-silicon with a particle size of 100nm to the solution obtained in step (1), stirring at a speed of 1000r / min to obtain a mixture for 1h; stirring the mixture at a speed of 1000r / min and drying at 80°C;
[0080] (c), placing the dried mixture in step (b) in a tube furnace, blowing nitrogen, calcining at 500° C. for 2 hours, and collecting the sintered phase;
[0081] (d) ball milling the sintered phase obtained in step (c) to a particle size of ~10 μm, adding it to 50 mL of 1M glucose solution, and ultrasonically dispersing for 30 minutes to obtain a slurry;
[0082] (e) Spray drying the slurry obtained in step (d), calcining at 650° C. for 2 h under nitrogen to obtain a sintered phase, crushing the sintered phase, and collecting a black po...
Embodiment 2
[0086] In this embodiment, except that the calcination temperature in the step (e) is changed to 950° C.; the 0.5M hydrochloric acid solution in the step (f) is replaced by a 1M acetic acid solution, the rest are the same as in Example 1.
[0087] The prepared silicon-carbon material was used as the negative electrode of the lithium-ion battery. The specific capacity of the silicon-carbon material negative electrode in this embodiment can reach 735mAh / g, the first Coulombic efficiency can reach 86.4%, and the specific capacity retention rate after 100 cycles can reach 94.7%.
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