Sulfur covalently bonded graphene with large capacity and high rate for high-performance sodium-ion batteries anodes

N/S Co‐Doped 3 D Porous Carbon Nanosheet Networks Enhancing Anode Performance of Sodium‐Ion Batteries

“…Upon turning back to 0.05 Ag À1 ,t he restored capacity recovers to 333.8 mA hg À1 .N SPCNN-2 shows outstanding cycling performance and rate capability,w hich are superior to other electrodes. [14,18,35,37] For further elucidation of the remarkable Na-storage performance at high current densities, NSPCNN-2 was evaluated at 0.5 Ag À1 for long-term cycling. [14,18,35,37] For further elucidation of the remarkable Na-storage performance at high current densities, NSPCNN-2 was evaluated at 0.5 Ag À1 for long-term cycling.…”

“…Additionally,d oping with S, with its larger size and lower electronegativity,m ay furtheri ncrease the interlayer space,p roviding additionalr eactions ites and significantly facilitating the Na + insertion/extraction process. [18] However,s ingle-element-doped carbonaceous materials unavoidably encounter ac hoke point along with limitedi mprovementi n specific capacity.H ence, the co-dopingm ethod is employed to enhancet he electrochemical performance of carbonaceous materials. [18] However,s ingle-element-doped carbonaceous materials unavoidably encounter ac hoke point along with limitedi mprovementi n specific capacity.H ence, the co-dopingm ethod is employed to enhancet he electrochemical performance of carbonaceous materials.…”

A high performance sulfur-doped disordered carbon anode for sodium ion batteries

“…43 The changes of binding energy of S2p reveal that the electrochemical reaction of S and Na involves the C-S x -C(x=1-2) bond cleavage and rearrangement of sulfur atoms, which can be further evidenced by Raman shift. As shown in the Raman spectra in Figure S4, when fully discharged to 0.01 V, the peaks at ~360 cm -1 (C-S bond) and ~485 cm -1 (S-S bond) are vanished and then reappeared at the fully charged state (3.0 V), confirming the cleavage and reconstruction of the C-S x -C (x=1-2)bonds.…”

S‐Doped Carbon Fibers Uniformly Embedded with Ultrasmall TiO2 for Na+/Li+ Storage with High Capacity and Long‐Time Stability

“…This observation may be explained by the decomposition of the electrolyte and the formation of solid electrolyte interface (SEI) film . The peak at a lower voltage (below 0.6 V) can be ascribed to the sodium insertion in carbon . The oxidation peaks located at 1.8 and 2.2 V are almost identical in the succeeding cycles and show similar peak currents and curves' superposition, showing the efficient storage stability of Na + .…”