2D Nanospace Confined Synthesis of Pseudocapacitance‐Dominated MoS₂‐in‐Ti₃C₂ Superstructure for Ultrafast and Stable Li/Na‐Ion Batteries

Abstract

Abstract Exploring a universal strategy to implement the precise control of 2D nanomaterials in size and layer number is a big challenge for achieving ultrafast and stable Li/Na‐ion batteries. Herein, the confined synthesis of 1–3 layered MoS 2 nanocrystals into 2D Ti 3 C 2 interlayer nanospace with the help of electrostatic attraction and subsequent cetyltrimethyl ammonium bromide (CTAB) directed growth is reported. The MoS 2 nanocrystals are tightly anchored into the interlayer by 2D confinement effect and strong MoC covalent bond. Impressively, the disappearance of Li + intercalated into MoS 2 reduction peak is successfully observed for the first time in the experiment, showing in a typical surface‐controlled charge storage behavior. The pseudocapacitance‐dominated contribution guarantees a much faster and more stable Li/Na storage performance. As predicted, this electrode exhibits a very high Li + storage capacity of 340 mAh g −1 even at 20 A g −1 and a long cycle life (>1000 times). It also shows an excellent Na + storage capacity of 310 mAh g −1 at 1 A g −1 with a 1600 times high‐rate cycling. Such impressive confined synthesis strategy can be extended to the precise control of other 2D nanomaterials.