Preparation Of Water Hyacinth Biomass-based Hard Carbon And Its Application In Sodium-ion Batteries

Based on the concept of “green chemistry”,the experiment explored that most of the aquatic plant water hyacinth petiole was prepared by high temperature carbonization,hydrothermal recarbonization at different temperatures,and a biomaterial-based sodium battery anode material was prepared.performance.The structure and properties of the water hyacinth itself were tested by scanning electron microscopy(SEM),X-ray diffraction(XRD),Raman spectroscopy(Raman),and thermogravimetry.Using constant current charge and discharge test and rate performance test,the storage capacity and electrochemical performance characterization were explored.The results show that in SIB,the directly carbonized water hyacinth biochar has the highest discharge capacity after treatment at 1400 °C,and the reversible capacity of the sample reaches 352.1 m Ah/g at 20 m A·g-1 current density.A battery anode material that is environmentally friendly and can be utilized efficiently and resourcefully.At the same time,the electrode exhibits excellent cycle stability,and high rate performance and long cycle performance are also outstanding.The capacity retention rate is above 88% after 200 cycles at a current density of 100 m A/g.At present,hydrothermal preparation of carbon materials is an effective method to improve electrochemical performance.After hydrothermal treatment of the biomass carbon material,the pore structure is rich,the specific surface area is large,and the surface has abundant functional groups,which provides more active sites for sodium intercalation.In this thesis,hydrothermal synthesis of dilute hydrochloric acid and water hyacinth with different concentrations was studied to produce a large number of biomass carbon microspheres.Among them,the carbon material with the concentration of 0.5 mol/L dilute hydrochloric acid is the best.Therefore,the carbon material was dug down and carbonized at 800℃,1000℃,1200℃,and 1400℃,and then assembled with a sodium ion battery to investigate the effect on sodium storage performance.After electrochemical performance tests,the carbon microspheres after carbonization at 1200 °C have a reversible specific capacity of 385 m Ah/g,which is higher than that of directly carbonized water hyacinth biomass.Therefore,our exploration is meaningful.