Three-dimensional VS4/graphene hierarchical architecture as high-capacity anode for lithium-ion batteries

Strengthening the Interface between Flower‐Like VS4 and Porous Carbon for Improving Its Lithium Storage Performance

“…In the first cycle of VS 4 (Figure S6a, Supporting Information), the reduction peaks at 1.8, 1.6, and 1.3 V are related to lithiation process ( x Li + + xe ‐ + VS 4 → Li x VS 4 ), and the peak around 0.6 V is owning to the conversion of Li x VS 4 to Li 2 S and elemental V. [ 25,26 ] On the contrary, the two obvious peaks around 1.9 and 2.5 V during the charge process are related to either the delithiation of Li 2 S with the formation of amorphous VS 4 or the conversion reaction of Li 2 S to S. However, the two reduction peaks around 1.6 and 0.7 V disappear during the subsequent cycles, and the intensity of the couple of peaks become weaker indicating the poor cycle performance. [ 28 ] Apart from the initial cycles, the curves of VS 4 −HC‐0.02 (Figure S6b, Supporting Information), VS 4 −HC‐0.04 (Figure S6c, Supporting Information), and VS 4 −HC‐0.08 (Figure S6d, Supporting Information) show two pairs of reversible peaks around 1.3−1.8 V and 1.9−2.5 V, which are related to the lithiation−delithiation process in the amorphous VS 4 . The following cycles of VS 4 −HC‐0.02 overlap much better than that of the other three anode materials, implying the superior lithium ions storage performance of VS 4 −HC‐0.02.…”

“…Yang et al [ 24 ] synthesized various VS 4 anode materials, including VS 4 nanowires, octopus‐VS 4 , sea grass‐VS 4 , and urchin‐VS 4 to improve the storage performance. Moreover, an extra mainstream strategy is preparing VS 4 and various carbon materials or conductive polymer composite to further improve the electrochemical performance, including RGO−VS 4 , [ 23,28,29 ] MWCNTs−VS 4 , [ 30 ] CNFs−VS 4 , [ 31 ] and PANI−VS 4 . [ 32 ] Many reports have ascribed the “synergistic effects” deriving from VS 4 and carbon materials.…”

Recent Progress in the Applications of Vanadium‐Based Oxides on Energy Storage: from Low‐Dimensional Nanomaterials Synthesis to 3D Micro/Nano‐Structures and Free‐Standing Electrodes Fabrication

“…5) Recently, except vanadium-based oxides, some other vanadium-based compounds, such as vanadium nitrides, [194][195][196][197][198][199][200][201][202] vanadium sulfides, [203][204][205][206] vanadium carbides, [207] and so on, have also attracted increasing attention for the application of energy storage in recent years due to their renowned chemical and physical properties. 5) Recently, except vanadium-based oxides, some other vanadium-based compounds, such as vanadium nitrides, [194][195][196][197][198][199][200][201][202] vanadium sulfides, [203][204][205][206] vanadium carbides, [207] and so on, have also attracted increasing attention for the application of energy storage in recent years due to their renowned chemical and physical properties.…”

Synthesis and characterization of sulfophenyl-functionalized reduced graphene oxide sheets

“…Graphene is a two-dimensional carbon material consisting of a single-atom-thick graphitic layer that has been used in electronic devices, 1,2 composite materials 3,4 and energy storage systems. [5][6][7][8][9] Graphene is commonly produced from natural graphite, which is widely available at low cost. 10 However, graphene is not directly prepared from graphite.…”

“…4,19 Opening the band gap of graphene and its derivative by doping, intercalation or graing by organic molecules would be useful for applications mentioned above. 6,8 Importantly, functionalization with organic molecules led to a good dispersion of graphene in common organic solvents. 20 For several large-scale applications, RGO is a more widely used and attractive material than graphene.…”