Preparation optimization of flour-derived porous carbon and its application in Si/C anode materials

Through a shape-preserving carbonization process and a further activation process, the natural porous flour was carbonized to obtain flour-derived porous carbon (FPC) with abundant pores, and FPC was applied to silicon-porous carbon anode material and its electrochemical performance was evaluated. The results show that the optimal holding temperature of preparing FPC is 750 °C, and the optimal mass ratio amount of KOH/pre-C is 2. After 100 cycles at 0.1 A g−1, the reversible capacity of FPC is only 291 mAh g−1, while the reversible capacities of 30%-Si/FPC composite and 100%-Si are 771.34 mAh g−1 and 1241 mAh g−1, respectively. Although 30%-Si/FPC composite displays only 62% of 100%-Si’s capacity, it shows good cycle stability, reduces the amount of nano silicon material and the application cost in lithium-ion batteries, and improves the utilization efficiency of nano silicon material. The application of flour-derived porous carbon will promote the development of Si/C anode materials.