Hollow Ti₃C₂ MXene/Carbon Nanofibers as an Advanced Anode Material for Lithium‐Ion Batteries

Abstract

Lithium-ion batteries (LIBs) are rechargeable batteries that have attracted great interest as next-generation energy storage devices that will lead future energy technologies because of their various excellent advantages. Two-dimensional (2D) MXene-based LIBs have been actively investigated because of their high energy/power density and good performance at high charge/discharge rates. However, three major limitations of 2D MXene electrodes -self-stacking, low specific surface area, and disturbance of Li + diffusion by surface terminations -have hindered the commercialization of MXene-based LIBs. Herein, we fabricate 1D hollow Ti 3 C 2 T x MXene/carbon (MX/C) nanofibers via an electrospinning process and use them as anode materials in LIBs. Compared with the pristine 2D MXene (MX) paste electrode and MXene/carbon (MX/C) paste electrode, the hollow MX/C nanofibers electrode exhibits a greater specific surface area, less self-stacking of flakes, and surface functional groups tailored for LIBs. The LIBs based on the hollow electrode exhibit a higher energy density (306.5 mA h g À 1 at 40 mA g À 1 ) than those with the MX paste electrode (81.08 mA h g À 1 at 40 mA g À 1 ) and MX/C paste electrode (196.9 mA h g À 1 at 40 mA g À 1 ). In addition, the hollow MX/C nanofiber electrode shows a high reversible capacity, proving that it is a promising anode material for LIBs.

Ti3C2TxMXene/carbon nanofiber multifunctional electrode for electrode ionization with antifouling activity

“…3c show the in-plane (E g ) and out-of-plane (A 1g ) vibration modes for the C atoms of Ti 3 C 2 T x to be around 640 cm −1 , whereas the peak at 435 cm −1 was assigned to the E g -group vibration originating from inplane Ti atoms. 37 The broad peaks at 1330-1400 cm −1 and 1587-1683 cm −1 corresponded to the defect-induced mode (Dband) and graphite-induced mode (G-band), respectively. The D-band denoted the sp 3 hybrid-disordered carbon structure, whereas the G-band represented the sp 2 hybrid graphitic carbon structure.…”

“…Electrospinning technology decentralizes MXene nanosheets, and endows multifunctional electrodes with a self-supporting ability. Research on the structure of MXene-based carbon nanobers has been limited to capacitors and Li + /Na + batteries, [33][34][35][36][37] whereas the fascinating properties of ion removal and antibacterial performance in aqueous solution have yet to be investigated. This work is interesting because it exemplies the rational design of multifunction CDI electrodes.…”

Surface-Modified MXenes: Simulation to Potential Applications

“…Indeed, the investigation of MXene as a useful material in LIBs has been continuously growing since the second year of its discovery (Figure ). MXene offers a promising energy storage material because it has lower diffusion barriers which are essential to improve the rate performance of ion barriers. ,, For example, Seo et al investigated a hollow Ti 3 C 2 MXene/carbon nanofiber composite for LIBs with an energy density of 306.5 mAh g –1 at 40 mA g –1 . They fabricated a 1D hollow MXene carbon composite using the electrospinning method and used it as an anode material for LIBs.…”

Anionic Activity in Fast-Charging Batteries: Recent Advances, Prospects, and Challenges

“…However, the conventional preparation of MXenes by selectively etching A atoms from MAX phase materials (A, IVA, or IIIA group elements such as Al) with disorderly terminated −O/OH/F groups might be overshadowed by their small specific capacities (mostly for Li + storage, less than 150 mAh·g –1 ), − suppressed electronic conductivity, and a decreased instinctive chemical stability. − …”