Electrospun Single Crystalline Fork-Like K2V8O21 as High-Performance Cathode Materials for Lithium-Ion Batteries

Abstract

Single crystalline fork-like potassium vanadate (K2V8O21) has been successfully prepared by electrospinning method with a subsequent annealing process. The as-obtained K2V8O21 forks show a unique layer-by-layer stacked structure. When used as cathode materials for lithium-ion batteries, the as-prepared fork-like materials exhibit high specific discharge capacity and excellent cyclic stability. High specific discharge capacities of 200.2 and 131.5 mA h g−1 can be delivered at the current densities of 50 and 500 mA g−1, respectively. Furthermore, the K2V8O21 electrode exhibits excellent long-term cycling stability which maintains a capacity of 108.3 mA h g−1 after 300 cycles at 500 mA g−1 with a fading rate of only 0.043% per cycle. The results demonstrate their potential applications in next-generation high-performance lithium-ion batteries.

Construction of Cu7KS4@NixCo1–x(OH)2 Nano-Core–Shell Structures with High Conductivity and Multi-Metal Synergistic Effect for Superior Hybrid Supercapacitors

“…The diffraction peaks at 934.2 and 956.8 eV correspond to the weak peaks of Cu 2p 3/2 and Cu 2p 1/2 , respectively, and the one at 948.1 eV belongs to a satellite peak, which is a typical feature of Cu 2+ . The fine spectrum of K 2p (Figure e) shows clearly separated orbitals of K 2p 1/2 and K 2p 3/2 , in agreement with the reported results . The high-resolution spectrum of S 2p is shown in Figure f, and two characteristic peaks located at 161.1 and 162.3 eV can be attributed to the S–S species .…”

“…36 The fine spectrum of K 2p (Figure 2e) shows clearly separated orbitals of K 2p 1/2 and K 2p 3/2 , in agreement with the reported results. 37 The high-resolution spectrum of S 2p is shown in Figure 2f, and two characteristic peaks located at 161.1 and 162.3 eV can be attributed to the S−S species. 38 The emergence of the high-resolution spectra of Ni 2p, Co 2p, and O 1s demonstrates the successful preparation of the CKS@ N 0.75 C 0.25 OH NCSS composite.…”

Experimental correlation of Mn3+cation defects and electrocatalytic activity of α-MnO2– an X-ray photoelectron spectroscopy study

“…92,93 Moreover, Ag 3d, [94][95][96] K 2s (ref. 97, 98 and 99) and K 2p partial photoemissions [100][101][102] can be observed in the survey spectra of the as-synthesized a-MnO 2 catalysts, which can be attributed to the incorporation of Ag and K, as has been discussed in the previous section. Fig.…”

Effects of Tree Harvesting Time and Tannin Cold-/Hot-Water Extraction Procedures on the Performance of Spruce Tannin Biocoagulant for Water Treatment

“…S2) [30]. Furthermore, the overlaid C1s spectra for the summer samples displayed visible doublet peaks at 292.8 eV and 295.6 eV and were ascribed to K2p 3/2 and K2p 1/2 of potassium [31,32]. The peak at 292.8 eV also contains an overlapping π-π* shakeup satellite attributed to sp 2 aromatic carbon [33].…”