An ecofriendly and universal strategy to balance the active sites and electrical conductivity of biomass-derived carbon for superior lithium storage

Abstract

Biomass-derived hard carbons are one of the most promising anode materials for lithium-ion batteries. However, the further development is restricted by their trade-off between the capacity and rate property. It...

Coal-Based 2D Ultrathin N-Doped Hierarchical Porous Carbon Nanosheets Induced by Dual-Salt System of Na2CO3–K2CO3 for High-Performance Supercapacitors

“…Raman spectroscopy (Figure 4b) can reveal the D peak (1350 cm −1 ) and G peak (1580 cm −1 ) of carbon materials. 31,32 Compared to NCPNs-1, the other three show I D /I G values in their Raman spectra that are all below 1.90, clearly indicating that the addition of Na 2 CO 3 has a positive effect on the crystallinity of NCPNs. Figure 4c shows the nitrogen adsorption−desorption curves, which consist of type I and IV isotherms.…”

“…In comparison to NCPNs-1, the XRD peaks of the other three are more sharp and have a narrower peak width, verifying that the addition of sodium carbonate effectively enhances the crystallinity of NCPNs. Raman spectroscopy (Figure b) can reveal the D peak (1350 cm –1 ) and G peak (1580 cm –1 ) of carbon materials. , Compared to NCPNs-1, the other three show I D / I G values in their Raman spectra that are all below 1.90, clearly indicating that the addition of Na 2 CO 3 has a positive effect on the crystallinity of NCPNs. Figure c shows the nitrogen adsorption–desorption curves, which consist of type I and IV isotherms.…”