Prelithiated V₂C MXene: A High‐Performance Electrode for Hybrid Magnesium/Lithium‐Ion Batteries by Ion Cointercalation

Abstract

The pursuit of high reversible capacity and long cycle life for rechargeable batteries has gained extensive attention in recent years, and the development of applicable electrode materials is the key point. Herein, thanks to the preintercalation of lithium ions, a stable and highly conductive nanostructure of V2C MXene is successfully fabricated via a facile self‐discharge mechanism, which provides open spaces for rapid ion diffusion and guarantees fast electron transport. Taking the prelithiated V2C as electrode, an outstanding initial coulombic efficiency of 80% and an impressive capacity retention of ≈98% after 5000 charge/discharge cycles are achieved for lithium‐ion batteries. Especially, it demonstrates a fascinating reversible capacity of up to 230.3 mA h g−1 at 0.02 A g−1 and a long cycling life of 82% capacity retention over 480 cycles in the hybrid magnesium/lithium‐ion batteries. In addition, the Mg2+ and Li+ ions cointercalation mechanism of the prelithiated V2C is elucidated through ex situ X‐ray diffraction and X‐ray photoelectron spectroscopy characterizations. This work not only offers an effective approach to compensate the large initial lithium loss of high‐capacity anode materials but also opens up a new and viable avenue to develop promising hybrid Mg/Li‐storage materials with eminent electrochemical performance.

MXene saturable absorber enabled hybrid mode-locking technology: a new routine of advancing femtosecond fiber lasers performance

“…Transmission electron microscopy (TEM) analysis of exfoliated nanosheets ( Figure 1B) exhibits the as-prepared V 2 CT x nanosheets to be quite thin with ~50 to ~200 nm lateral range. The crystal structure was further confirmed by high-resolution TEM and selected area electron diffraction, exhibiting a set of clear lattice fringes with an inner plane spacing of 0.24 nm ( Figure 1C), corresponding to the (01 ̅ 10) plane of MXene V 2 C, Figure 1C, in good agreement with previous results [36,37]. Atomic force microscopy was employed to further investigate the as-synthesized MXene V 2 CT x nanosheets ( Figure 1D).…”

Self-supporting V2O5 nanofiber-based electrodes for magnesium–lithium-ion hybrid batteries

“…Mg 2+ or Mg-based complexes, are irreversibly intercalated or adsorbed on the surface of the V 2 O 5 nanobers. As it is reported that Mg 2+ can be intercalated but not de-intercalated, 8,12,28,29 we assume that Mg 2+ is the species which is irreversibly intercalated. To verify this, we analyzed the shi of the anodic peak current towards higher potentials with increasing the scan rate.…”

Challenges and Recent Progress on Key Materials for Rechargeable Magnesium Batteries

“…[ 52 ] In addition, MXene also possesses excellent performance in magnesium/lithium‐ion batteries (MLIBs), [ 53 ] for example, by Mg 2+ /Li + co‐intercalation, the prelithiated V 2 C MXene with a stable and highly conductive nanostructure possessed a high reversible capacity of up to 230.3 mA h g −1 at 0.02 A g −1 and a fascinating capacity retention of 82% over 480 cycles in MLIBs. [ 54 ] Considering the large variety of MXenes, these works indicate that much more cathode materials are potentially available for RMBs.…”