Low‐Temperature Reduction Strategy Synthesized Si/Ti₃C₂ MXene Composite Anodes for High‐Performance Li‐Ion Batteries

Abstract

Silicon is attracting enormous attention due to its theoretical capacity of 4200 mAh g−1 as an anode for Li‐ion batteries (LIBs). It is of fundamental importance and challenge to develop low‐temperature reaction route to controllably synthesize Si/Ti3C2 MXene LIBs anodes. Herein, a novel and efficient strategy integrating in situ orthosilicate hydrolysis and a low‐temperature reduction process to synthesize Si/Ti3C2 MXene composites is reported. The hydrolysis of tetraethyl orthosilicate leads to homogenous nucleation and growth of SiO2 nanoparticles on the surface of Ti3C2 MXene. Subsequently, SiO2 nanoparticles are reduced to Si via a low‐temperature (200 °C) reduction route. Importantly, Ti3C2 MXene not only provides fast transfer channels for Li+ and electrons, but also relieves volume expansion of Si during cycling. Moreover, the characteristics of excellent pseudocapacitive performance and high conductivity of Ti3C2 MXene can synergistically contribute to the enhancement of energy storage performance. As expected, Ti3C2/Si anode exhibits an outstanding specific capacity of 1849 mAh g−1 at 100 mA g−1, even retaining 956 mAh g−1 at 1 A g−1. The low‐temperature synthetic route to Si/Ti3C2 MXene electrodes and involved battery‐capacitive dual‐model energy storage mechanism has potential in the design of novel high‐performance electrodes for energy storage devices.

Interface Chemistry on MXene‐Based Materials for Enhanced Energy Storage and Conversion Performance

“…Subsequently, SiO 2 nanoparticles are reduced to Si via a low-temperature reduction route. [79] In Situ Polymerization: Conductive polymers have shown great potential in electrochemical energy storage due to their large surface area, structural tunability and high redox activity. The combination of conductive polymers and MXenes is promising to construct nanocomposites with higher electrochemical performance due to their synergistic effect.…”

A Facile, High‐Yield, and Freeze‐and‐Thaw‐Assisted Approach to Fabricate MXene with Plentiful Wrinkles and Its Application in On‐Chip Micro‐Supercapacitors

“…MXene, an intriguing member of 2D nanomaterial family, is endowed with the amalgamation of superior electrical conductivity, large specific surface area, and hydrophilic surfaces, and has been widely used in Li‐ion batteries, electrochemical storage systems, electromagnetic interference shielding, electrocatalysts, photo‐to‐thermal conversion, etc. Up to now, over 20 species of 2D MXenes have been reported .…”

Strongly Coupled MoS2 Nanocrystal/Ti3C2 Nanosheet Hybrids Enable High‐Capacity Lithium‐Ion Storage

“…Hui et al. demonstrated that Ti 3 C 2 hosts can significantly boost the rate capability and cycling durability of Si NPs …”

“…[9b] Hui et al demonstrated that Ti 3 C 2 hosts can significantly boost the rate capability and cycling durability of Si NPs. [13] Ma et al prepared MoS 2 -in-Ti 3 C 2 composites through electrostatic adsorption followed by ac etrimoniumb romide (CTAB)regulated growth. [12] The as-derivedM oS 2 -in-Ti 3 C 2 electrode delivered ah igh capacity of 340 mAh g À1 even at 20 Ag À1 and a satisfactory lifetime, but only under al ow MoS 2 content of approximately 50.3 wt %.…”