Preparation of Biomass Corn Straw Derived Carbon Materials and Their Sodium Storage Performance
QIN Decai;GAO Yuanqian;Luo Shan;WANG Jianchen;XU Guiyin;Shenzhen Edge Medical Robotics Co.,Ltd.;
Massive crop straw residues from modern agriculture do much harm to the environment and daily life due to the dispose mode of burning.Hence,the effective utilization of crop residues has been attracted much attention.Herein,carbon sheets derived from corn stalk pith were synthesized and showed an excellent performance via a simple high temperature carbonization and chemical expansion process.The morphology study showed that the obtained carbon materials presented the honeycomb-like shape in the cross-section and the hollow tubular array structure with abundant pores in the vertical section,which could promote the transportation and diffusion of sodium ions.The(002)crystal planes showed that the intercalation distance of carbon sheets was 0.376 nm(graphite:0.335 nm),which could benefit the sodium ion de/intercalation,improving the electrochemical performance of batteries.The obtained stalk pitch carbon sheets(SPCS)carbonized at 1 200 ℃(SPCS-1200)showed better sodium ion storage performance than that of SPC-900.SPCS-1200 exhibited a stable reversible capacity of 203 mAh·g-1 after 100 cycles at 50 mA·g-1.By contrast,the SPC-900 only had a capacity of 173 mAh·g-1 after 100 cycles.Moreover,SPCS-1200 showed excellent rate capability,which showed 100.7 mAh·g-1 at 1000 mA·g-1,even 65.9 mAh·g-1 at 2 000 mA·g-1.However,the initial reversible capacities of SPC-900 were about 45.7 mAh·g-1 and 31.2 mAh·g-1 at the corresponding current density,respectively.
【CateGory Index】： TM912