US 11,817,574 B2
Carbon-silicon three-dimensional structural composite material and preparation method thereof
Xuelian Wu, Fujian (CN); and Enqiang Zhang, Fujian (CN)
Assigned to XIAMEN HITHIUM ENERGY STORAGE TECHNOLOGY CO., LTD., Fujian (CN)
Filed by XIAMEN HITHIUM ENERGY STORAGE TECHNOLOGY CO., LTD., Fujian (CN)
Filed on Jul. 28, 2022, as Appl. No. 17/875,611.
Claims priority of application No. 202110863229.8 (CN), filed on Jul. 29, 2021.
Prior Publication US 2023/0033233 A1, Feb. 2, 2023
Int. Cl. H01M 4/36 (2006.01); C01B 32/184 (2017.01); C01B 32/198 (2017.01); H01M 4/38 (2006.01); H01M 4/587 (2010.01); B82Y 30/00 (2011.01); B82Y 40/00 (2011.01)
CPC H01M 4/364 (2013.01) [C01B 32/184 (2017.08); C01B 32/198 (2017.08); H01M 4/386 (2013.01); H01M 4/587 (2013.01); B82Y 30/00 (2013.01); B82Y 40/00 (2013.01); C01B 2204/22 (2013.01)] 18 Claims
OG exemplary drawing
 
1. A preparation method of a carbon-silicon three-dimensional structural composite material, comprising the following steps:
a first step of dissolving 0.004 g to 0.006 g of graphene quantum dots in 4 ml to 6 ml of ultrapure water, dropwise adding 0.65 ml to 0.85 ml of a CuCl2 or ZnCl2 solution having a concentration of 0.2 mol/ml to 0.3 mol/ml, and performing oscillation to generate a mixed emulsifier;
a second step of mixing the mixed emulsifier obtained in the first step with 10 ml to 20 ml of a graphite oxide aqueous solution having a concentration of 10 mg/ml to 20 mg/ml and 10 ml to 20 ml of a cyclohexane solution containing 0.1 g to 0.2 g of nanosilicon spheres, and performing homogenization for 20 s to 30 s to form a uniform oil-in-water emulsion;
a third step of adding 0.9 g to 1.2 g of hydrazine hydrate into the emulsion obtained in the second step for reduction, and performing a hydrothermal reaction to obtain a reduced emulsion; and
a fourth step of freeze-drying the reduced emulsion obtained in the third step, performing washing with a washing liquid, and performing vacuum drying, to obtain the carbon-silicon three-dimensional structural composite material.