V3S4 Nanosheets Anchored on N, S Co-Doped Graphene with Pseudocapacitive Effect for Fast and Durable Lithium Storage

Abstract

Construction of a suitable hybrid structure has been considered an important approach to address the defects of metal sulfide anode materials. V3S4 nanosheets anchored on an N, S co-coped graphene (VS/NSG) aerogel were successfully fabricated by an efficient self-assembled strategy. During the heat treatment process, decomposition, sulfuration and N, S co-doping occurred. This hybrid structure was not only endowed with an enhanced capability to buffer the volume expansion, but also improved electron conductivity as a result of the conductive network that had been constructed. The dominating pseudocapacitive contribution (57.78% at 1 mV s−1) enhanced the electrochemical performance effectively. When serving as anode material for lithium ion batteries, VS/NSG exhibits excellent lithium storage properties, including high rate capacity (480 and 330 mAh g−1 at 5 and 10 A g−1, respectively) and stable cyclic performance (692 mAh g−1 after 400 cycles at 2 A g−1).

Hierarchical 1D/2D V3S4@N, S-Codoped rGO Hybrids as High-Performance Anode Materials for Fast and Stable Lithium-Ion Storage

“…Notably, apart from the four primary peaks, another two peaks observed at 521 and 513.6 eV in the V 2p spectrum originated from the V–N bond in the hybrid materials . Furthermore, in the N 1s spectrum (Figure b), the peak located at 397.1 eV is assigned to the V–N bond, confirming the formation of VN in VG-70 hybrids again . Moreover, the high-resolution N 1s spectrum of the PV sample is illustrated in Figure S8.…”

Electrochemically intercalated intermediate induced exfoliation of few-layer MoS2 from molybdenite for long-life sodium storage

“…Moreover, the Tyndall effect can be clearly observed (Fig. S1c), indicating the formation of relatively thin, semiconducting nanosheets [29].…”

Green and Scalable Fabrication of Sandwich-like NG/SiOx/NG Homogenous Hybrids for Superior Lithium-Ion Batteries

“…To date, two charge storage mechanisms of the diffusion-controlled intercalation/alloying/conversion process and the capacitance-controlled pseudocapacitive process are involved in various electrode materials for LIBs [23,43,58]. The power-law relationship between the measured current (i) and sweep rates (v) is generally expressed as Equation (5), where a and b are adjustable parameters [1,43,57,59]. The b values could be determined by slopes of log (v) − log (i) plots, and two typical b values of 1 and 0.5 indicated that the electrode was dominated by capacitive behaviors and diffusive behaviors, respectively [45,54,57].…”

“…Lithium-ion batteries (LIBs) have attracted extensive attention in the energy storage field, owing to their high energy density, long lifespan, and low self-discharge properties [1][2][3][4][5]. However, present LIB systems based on carbon as anode and lithium metal oxides as cathode with low energy densities cannot satisfy the ever-growing energy demands for electronic devices [6][7][8][9].…”