Low-cost synthesis of hierarchical Co3V2O8 microspheres as high-performance anode materials for lithium-ion batteries

Rational Synthesis of “Grape‐like” Ni2V2O7 Microspheres as High‐capacity Anodes for Rechargeable Lithium Batteries

“…The electrochemical performance of V 2 O 5 /Ni 2 V 2 O 7 by EG can be seen in FigureS14, in which the NiVO@EG@12 output better performance in virtue of smaller microsphere size and some nanosheet structures contributing to shorter ion diffusion length. It is noted the capacity considerably increased, a common phenomenon in transition metal oxides, which can be attributed to the activation of material, reversible formation of gel‐like polymer layer, and interfacial ion storage among nanosized Li 2 O [12,31,41,50] . In Figure S15, the voltage profile for NiVO@30@12 clearly demonstrates additional plateau at ∼1.7 V, agreeing well with the CV curves for the sample with vanadium oxide.…”

“…It is noted the capacity considerably increased, a common phenomenon in transition metal oxides, which can be attributed to the activation of material, reversible formation of gel-like polymer layer, and interfacial ion storage among nanosized Li 2 O. [12,31,41,50] In Figure S15, the voltage profile for NiVO@30@12 clearly demonstrates additional plateau at~1.7 V, agreeing well with the CV curves for the sample with vanadium oxide. Electrochemical performance of V 2 O 5 /Ni 2 V 2 O 7 achieved by PVP and CTAB are exhibited in Figure S16-Figure S17, respectively.…”

“…In the nascent stage, we deployed the similar route in fabricating Co 3 V 2 O 8 (enabled by CoÀ PVP) following existed literature: the products were mostly V 2 O 5 by all means, shown in Figure 4 (a). [31] When NH 4 VO 3 is excessive (Ni/V ratio 1 : 2), besides microspheres, nanobelts can be observed, in Figure S4, which can be attributed to the severe self-decomposition of VO 3 À to vanadium oxide. A hint here is that Ni/V is important to induce more uniform morphology and phase.…”

“…Before we successfully applied EG, considerable efforts were paid to the synthesis with common surfactants (PVP and CTAB), but none of them resulted in pure‐phase Ni 2 V 2 O 7 concomitant with large amount of V 2 O 5 . In the nascent stage, we deployed the similar route in fabricating Co 3 V 2 O 8 (enabled by Co−PVP) following existed literature: the products were mostly V 2 O 5 by all means, shown in Figure 4 (a) [31] . When NH 4 VO 3 is excessive (Ni/V ratio 1 : 2), besides microspheres, nanobelts can be observed, in Figure S4, which can be attributed to the severe self‐decomposition of VO 3 − to vanadium oxide.…”

Co3V2O8 Nanoparticles Supported on Reduced Graphene Oxide for Efficient Lithium Storage

“…Among them, Co 3 V 2 O 8 (CVO) can absorb 15.4 Li + during the first discharge process with higher lithium ion storage [19]. However, the unavoidable pulverization and the agglomeration of bulk CVO material during cycling for lithium storage result in poor electrochemical performance and cycle life [20]. To address these weak points, compositing CVO with carbon materials is a common tactic with which to enhance the conductivity and serve as volume buffer matrix for large volume change [21][22][23].…”