Sulfur-doped porous carbon as high-capacity anodes for lithium and sodium ions batteries

S-doped porous carbon (S/C) has been successfully fabricated from biomass waste (drug residue). The S/C not only has a unique porous structure and channel, but porous structures are interconnected to form a sponge-like structures. The unique structure not only increases the specific surface area and energy storage sites, but also shortens the path of ion transmission and charge transfer. When S/C-1 is used as lithium ion batteries (LIBs) anode, the capacity of 710 mAh g(-1) can be achieved after 50 cycles at 0.1 A g(-1). The capacity still has 364 mAh g(-1) at 5 A g(-1) for long-life-cycle. For sodium ion batteries (SIBs), a capacity of 518 mAh g(-1) can be delivered at 0.1 A g(-1) for 50 cycles, and a capacity of long-life-cycle at 5 A g(-1) still maintains 230 mAh g(-1). The improving rate capacities of S/C-1 can be attributed to the short diffusion lengths of Li+ and Na+ ions for uniform sponge-like structure, large specific surface area (SSA) and additional active sites. This work has an important opportunity to change the current energy situation. (C) 2020 Elsevier B.V. All rights reserved.

Automated summary

The study successfully fabricated S-doped porous carbon from biomass waste and found it to exhibit high capacity and cycling stability in both lithium ion batteries and sodium ion batteries. The unique structure of the new material increases specific surface area and additional active sites, which is significant for enhancing battery performance.