In-situ-grown multidimensional Cu-doped Co1-S2@MoS2 on N-doped carbon nanofibers as anode materials for high-performance alkali metal ion batteries

Enhancing the Lithium Storage Performance of the Nb2O5 Anode via Synergistic Engineering of Phase and Cu Doping

“…The survey XPS spectra of the Cu-doped Nb 2 O 5 confirm that the Cu element has been introduced to monoclinic Nb 2 O 5 (Figures S7a and S8a). In the Nb 3d XPS spectrum of H–Nb 2 O 5 (Figure e), the peaks at 207.29 and 210.03 eV can be assigned to Nb 3d 5/2 and Nb 3d 3/2 of Nb 5+ , respectively. , After Cu doping, the Nb 3d peaks shift toward lower binding energies, indicating the chemical environment changes induced by the replacement of Nb 5+ by Cu 2+ . , As shown in the Cu 2p XPS spectra (Figures f and S8c), the two sharp peaks located at 931.6 and 951.3 eV can be indexed to Cu 2p 3/2 and Cu 2p 1/2 of Cu 2+ , while the other two peaks at 930.1 and 949.3 eV correspond to Cu 2p 3/2 and Cu 2p 1/2 of Cu + . Especially, the Cu 2+ /Cu + ratio in H–Cu 0.1 –Nb 2 O 5 is close to 3.75/1.00, suggesting that copper is mainly in the form of Cu 2+ . ,,, Figure S9 displays the Cu 2p XPS analysis of T–Cu 0.1 –Nb 2 O 5 .…”

“…Heteroatom doping has been considered as an effective strategy to improve the intrinsic conductivity and electrochemical properties of electrode materials . Doping ions with different atomic radii could induce lattice distortion, change the unit cell structure, expand the lattice channels, and increase the ion diffusion coefficient, thus enhancing the conductivity and electrochemical performance of the electrode materials. − Cu exhibits excellent electronic conductivity and considerable electrochemical catalytic function because of the special electronic configuration of the Cu atom (3d 10 4s 1 ); thus, Cu doping would facilitate to generate the impurity energy band and shorten the band gap width. − Chen et al reported that the Cu-doped CoO displayed excellent rate performance and cycle life, while Chen et al also demonstrated the enhanced electron conductivity and improved cycle/rate performance of Li 4 Ti 5 O 12 –TiO 2 via Cu doping …”

Synergistic V5S8/CoS nanoparticles-embedded carbon nanofiber as binder-free flexible anode for sodium-ion batteries

“…Additionally, a peak at 0.051 V suggests the insertion of Na + ions into amorphous carbon [32] . Notably, CV curves exhibit good overlap after the rst cycle, indicating that the electrochemical reaction of the 0.2-V 5 S 8 /CoS-CNFs electrode is reversible, and the material exhibits excellent structural stability.…”

Nanotubular Fe2O3 and Mn3O4 with hierarchical porosity as high-performance anode materials for lithium-ion batteries

“…Due to the superlong scale in the longitudinal direction, such a unique 1D structure offers a high surface to volume ratio, which could shorten migration pathways for lithium ions and offer an efficient 1D electron transport expressway along the longitudinal direction, thus giving rise to an enhanced rate capability and lithium storage performance. 35–37 For example, Wang et al proved that the 1D porous Fe 2 O 3 nanotubes exhibited an enhanced electrochemical performance in terms of the specific capacity and rate capability. 44 Although some progress has been made to engineer various 1D metal oxides, exploring a facile synthetic method to prepare one-dimensional Mn 3 O 4 and Fe 2 O 3 with the hierarchically porous and hollow architecture is still a great challenge.…”