玉米秸秆生物碳/硅复合纳米材料的制备及锂电池负极的性能研究OA北大核心CSTPCD

The raw material selected was agricultural residue waste corn straw,which was prepared into biochar/sili con composite nanomaterials through high-pressure kettle hydrothermal method,annealing heat treatment,and mechani-cal ball milling method.The structure and morphology of the prepared materials were characterized,and their electro-chemical performance as negative electrode materials for lithium-ion batteries was explored.The results indicated that bio-char nanomaterials exhibited a layered structure,and after high-temperature annealing,silicon particles were tightly and uniformly bound to the surface and structural edges of biochar;By using biochar as a carbon source,the crystal defects generated by the naturally occurring nitrogen atoms in biochar materials enhanced the conductivity and reactivity of carbon materials,thereby improving the electrochemical performance of biochar/silicon composite nanomaterials.Due to its higher specific surface area and less reversible capacity consumed by the solid electrolyte interface(SEI)film formed during cyc-ling,CSi1(carbon to silicon mass ratio of 3∶1)exhibited better cycling capacity performance compared to CSi2(carbon to silicon mass ratio of 5∶1),demonstrating better cycling stability and good rate performance.