Litchi shell-derived porous carbon for enhanced stability of silicon-based lithium-ion battery anode materials

The structural characteristics of litchi shell-derived carbon are conducive to regulation and modification. Using biomass waste litchi shells as carbon source and nano-silicon particles to prepare silicon-carbon composite materials to relieve the volume effect of silicon in the charge and discharge process, litchi shell-derived activated carbon (LAC) with high specific surface area (1011.115 m 2 g −1 ) and high porosity was obtained from litchi shell as silicon buffer matrix by simple high-temperature calcination and activation of ZnCl2. A silicon-carbon composite material (3D LAC@Si) with an embedded cladding structure was prepared with a high-energy ball milling process. In the electrochemical performance test, 3D LAC@Si as the negative electrode of a lithium-ion battery showed a high lithium storage capacity of 834.4 mAh g −1 and a high coulombic efficiency of 98.34% after cycling 100 cycles at a current density of 0.2A g −1 .