摘要
Hard carbon is considered as the most commercially applicable anode for sodium-ion batteries.Lignin has the characteristics of sustainable,low cost,high carbon content(>60%)and abundant oxygen functional groups,which is expected to be used as a promising candidate precursor for low-cost hard carbons.The structure and electrochemical performances of hard carbons could be regulated by adjusting carbonization temperature.The microstructure and electrochemical performance of LDHC anode are highly dependent on the carbonization tem-perature.Increasing carbonization temperature could reduce specific surface area and improve initial coulombic efficiency.The slope and plateau capacity of the LDHC anode could also be adjusted by changing the carboniza-tion temperature.The LDHC prepared at 1200℃ showed the best sodium-ion storage performance,with an initial coulombic efficiency of 78.9%and a reversible sodium-ion storage capacity of 284.7 mAh g^(−1).
基金
support from the National Natural Science Foundation of China(Grant No.22108044)
the Re-search and Development Program in Key Fields of Guangdong Province(2020B1111380002)
the Basic Research and Applicable Basic Research in Guangzhou City(202201010290)
the financial support from the Guangdong Provincial Key Laboratory of Plant Resources Biorefinery(2021GDKLPRB07,2021GDKLPRB-K06).
