摘要
将来源于造纸黑液中的碱木质素(AL)通过水热反应与纳米二氧化硅(SiO_2)复合,制备了二氧化硅/季铵化碱木质素复合物(SiO_2/QAL),再经过碳化和酸洗后得到二氧化硅/木质素多孔碳复合材料(SiO_2/PLC).形貌与结构表征结果表明,SiO_2/PLC的比表面积达到1069 m^2/g,具有平均孔径约20 nm的介孔结构.二氧化硅纳米颗粒均匀分散在三维网络结构的木质素多孔碳内部.电化学性能测试结果表明,SiO_2/PLC作为锂离子电池负极材料具有良好的倍率性能和循环性能,在100 mA/g电流密度下经过100周循环后放电比容量为820 mA·h/g,在5 A/g大电流密度下嵌锂容量达到235 mA·h/g.
The alkali lignin(AL)derived from pulping liquor was used as raw materials to prepare the silica/quaternized alkali lignin composite(SiO2/QAL)by hydrothermal reaction,and then the silica/porous lignin carbon composite(SiO2/PLC)was obtained after carbonization and etching.SiO2/PLC exhibited a specific surface area of 1069 m^2/g and mesoporous pore size of 20 nm on average.As anode materials for lithium?ion batteries,silica nanoparticles were dispersed uniformly in the porous lignin carbon with a three dimensional network,leading to better cycle performance and rate capability.The electrochemical measurement showed that SiO2/PLC displayed a high capacity of 820 mA·h/g after 100 cycles at a current density of 100 mA/g and 235 mA·h/g at a large current density of 5 A/g.
作者
李常青
杨东杰
席跃宾
秦延林
邱学青
LI Changqing;YANG Dongjie;XI Yuebin;QIN Yanlin;QIU Xueqing(School of Chemistry and Chemical Engineering;State Key Lab of Pulp and Paper Engineering,South China University of Technology,Guangzhou 510640,China;School of Chemical Engineering and Light Industry,Guangdong University of Technology,Guangzhou 510640,China;Guangdong Province Key Lab of Green Chemical Product Technology,South China University of Technology,Guangzhou 510640,China)
出处
《高等学校化学学报》
SCIE
EI
CAS
CSCD
北大核心
2018年第12期2725-2733,共9页
Chemical Journal of Chinese Universities
基金
国家自然科学基金(批准号:21878114,21436004)
广东省科技计划项目(批准号:2017B090903003,2017A030308012)资助
