| dc.description.abstract | This thesis is divided into two parts. The first part investigates the carbonization process of pumpkin-derived carbon material, KOH activator content, and the activation calcination temperature, aiming to identify the optimal conditions to obtain the pumpkin-derived activated carbon material PAC-4-6. Mn3O4 is incorporated into PAC-4-6 using an impregnation method, synthesizing Mn3O4@PAC-4-6 composite material, which is evaluated as an anode material for lithium and sodium ion batteries. XPS and TEM mapping analyses show that PAC-4-6 contains trace amounts of nitrogen, sulfur, and oxygen, indicating heteroatom self-doping. Experimental results demonstrate that Mn3O4(30)@PAC-4-6 exhibits excellent electrochemical performance, achieving a capacity of 879.8 mAh/g after 70 cycles at 0.1 A/g in lithium-ion batteries, and maintaining a stable capacity of 180.1 mAh/g after 200 cycles at 0.05 A/g in sodium-ion batteries.
The second part uses ZIF-67 as a precursor, which is calcined in a H2/Ar mixed gas to reduce Co2+ to Co nanoparticles, forming Co@C. This is mixed with hydrophilic PAC-4-6 and subjected to a sulfidation reaction to synthesize CoS2@PAC-4-6, applied as an anode material for lithium-ion batteries. Adding PAC-4-6 enhances conductivity and mitigates volume expansion of CoS2 during cycling. The lithium-ion battery achieves a specific capacity of 710.3 mAh/g after 240 cycles at 0.1 A/g, indicating excellent cycling stability. | en_US |