To obtain resource-rich and cost-effective biomass-derived carbon as negative electrode materials for lithium-ion batteries,Baijiu distiller's grains were used as the raw material,with ZnCl2 as the activating agent,employing a two-step carbonization method to obtain porous carbon materials.The study explored the influence of high-temperature carbonization temperature on the structure,morphology,evolution of valence states,and electrochemical lithium storage performance of porous carbon materials.The results indicate that with an increase in carbonization temperature,the crystallinity of the porous carbon materials increases,while the specific surface area decreases,defect concentration reduces,and the proportion of graphitic nitrogen increases,contributing to enhanced electrical conductivity of the carbon materials.When used as lithium storage negative electrode materials,porous carbon prepared at 650℃ exhibits the highest initial Coulombic efficiency of 71.8％,a high specific capacity of 510.8 mAh·g-1(at 0.1A·g-1),excellent rate capability(maintaining a specific capacity of 127.3 mAh·g-1 at 5 A·g-1),and a low and safe operating voltage(0.5 V(vs.Li/Li+)),enabling high power density and outstanding safety when constructing batteries.The research results provide a new approach for the preparation of Baijiu lees-based porous carbon materials and the resource utilization of Baijiu distiller's grains waste.
关键词
白酒酒糟/碳材料/高温碳化/锂离子电池/负极材料
Key words
Baijiu distiller's grains/Carbon materials/High-temperature carbonization/Lithium-ion battery/Negative electrode material
维普
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