Crystallined Hybrid Carbon Synthesized by Catalytic Carbonization of Biomass and in-situ Growth of Carbon Nanofibers  

作　　者：Shuhe Liu Shuchun Zhao Yaochun Yao Peng Dong Chao Yang 

机构地区：[1]National Engineering Research Center of Waste Recovery,Kunming University of Science and Technology [2]Faculty of Metallurgical and Energy Engineering,Kunming University of Science and Technology

出　　处：《Journal of Materials Science & Technology》2014年第5期466-472,共7页材料科学技术（英文版）

基　　金：supported by the National Natural Science Foundation of China(No.51264016);the Natural Science Foundation of Yunnan Province of China(No.2009ZC006X);the Scientific Research Foundation of Kunming University of Science and Technology,China(No.2009-027);the Analysis and Testing Foundation of Kunming University of Science and Technology,China(No.2011458)

摘　　要：Crystallined hybrid carbon was synthesized by the catalytic carbonization of biomass （Pinus kesiya sawdust） at 1100 ℃ and in-situ growth of carbon nanofibers （CNFs） at 750 ℃ from acetylene. The microstructure of the composite was characterized by scanning electron microscopy （SEM）, X-ray diffraction （XRD）, transmission electron microscopy （TEM） and high-resolution transmission electron microscopy （HRTEM）. It was found that highly crystallined carbon composed of well-aligned graph℃ene layers with interlayer spacing of 0.34 nm can be formed by catalytic carbonization of biomass. However, the structure of the in-situ growing CNFs is lessaligned. Based on the results of the investigation, the formation mechanism of the crystallined hybrid carbon was discussed. Owning to synergistic effect of the highly crystallined carbon and the conductive network formed by CNFs, the crystallined hybrid carbon shows 32.6% lower electrical resistivity than biocarbon. When being used as anode material of lithium-ion batteries （LIBs）, the crystallined hybrid carbon and the biocarbon have nearly the same first coulombic efficiencies （CEs）, however, the former has a discharge capacity of 67% higher than the latter since the second cycle.Crystallined hybrid carbon was synthesized by the catalytic carbonization of biomass （Pinus kesiya sawdust） at 1100 ℃ and in-situ growth of carbon nanofibers （CNFs） at 750 ℃ from acetylene. The microstructure of the composite was characterized by scanning electron microscopy （SEM）, X-ray diffraction （XRD）, transmission electron microscopy （TEM） and high-resolution transmission electron microscopy （HRTEM）. It was found that highly crystallined carbon composed of well-aligned graph℃ene layers with interlayer spacing of 0.34 nm can be formed by catalytic carbonization of biomass. However, the structure of the in-situ growing CNFs is lessaligned. Based on the results of the investigation, the formation mechanism of the crystallined hybrid carbon was discussed. Owning to synergistic effect of the highly crystallined carbon and the conductive network formed by CNFs, the crystallined hybrid carbon shows 32.6% lower electrical resistivity than biocarbon. When being used as anode material of lithium-ion batteries （LIBs）, the crystallined hybrid carbon and the biocarbon have nearly the same first coulombic efficiencies （CEs）, however, the former has a discharge capacity of 67% higher than the latter since the second cycle.

关 键 词：Carbon nanofibers BIOMASS Catalytic carbonization Lithium-ion batteries 

分 类 号：TQ127.11[化学工程—无机化工] TQ342.742