Richly electron-deficient BC_xO_3−x anodes with enhanced reaction kinetics for sodium/potassium-ion batteries

Abstract

Facing to the global carbon neutrality, the mass production of sodium-ion batteries (SIBs) and potassium-ion batteries (PIBs) is severely restricted by their low capacities and inferior kinetics of anode materials....

Nickel foam deposited with borophene sheets used as a self-supporting binder-free anode for lithium-ion batteries

“…9) were performed using the Vienna Ab Initio Simulation Package (VASP). 60 In this study, sufficient structural analyses indicate that the NF8 sample has ultrahigh lithium storage potential because of high-quality borophene sheets with enriched electron deficiencies 59 and high charge transfer characteristics, but this has not yet been confirmed by the corresponding electrochemical results. Even the high oxygen concentration is advantageous for improving the wettability of the LIB electrolyte and introduces more electrochemical active sites, ultimately resulting in better reaction kinetics, but fails to decrease the migration barrier of charge/ion; thus, borophene is exposed to air, and its electron configuration quickly reaches a stable state and loses its reactivity.…”

“…The capacitive contribution with a nearly constant value, whether at low or high rates, demonstrates that the speedy near-surface region reaction is produced on the surface, thus compensating for the rapid capacity loss of the ion diffusion process at high charge/discharge current to achieve a high-rate cyclic performance. 57–59…”

“…The capacitive contribution with a nearly constant value, whether at low or high rates, demonstrates that the speedy nearsurface region reaction is produced on the surface, thus compensating for the rapid capacity loss of the ion diffusion process at high charge/discharge current to achieve a highrate cyclic performance. [57][58][59] To elucidate the Li storage mechanism in the nickel foam electrode deposited with borophene sheets, the DFT calculations (Fig. 9) were performed using the Vienna Ab Initio Simulation Package (VASP).…”

Boron and nitrogen double‐doped carbon flower prepared by in‐situ copolymerization as anode materials for lithium‐ion batteries

“…The BC and BO bonds inherit from BNPF (Figure S3d). The high‐resolution O 1s XPS spectra (Figure 5c) can be deconvolved into components at 530.7, 532.5, and 537.5 eV, which can be assigned to OC, OC/COC, and BO, respectively 36 . As shown in Figure 5d, four main peaks in the XPS C1s spectra are assigned to CC/CC (284.78 eV), CN/CO (285.7 eV), CN/CO (287.4 eV) and OCO (291 eV) 37,38 .…”