Rational Design of Hierarchical TiO2/Epitaxially Aligned MoS2–Carbon Coupled Interface Nanosheets Core/Shell Architecture for Ultrastable Sodium‐Ion and Lithium–Sulfur Batteries

Abstract

AbstractThe development of electrode materials with superior cycling stability is currently receiving intensive research for next‐generation portable electronic equipment. Herein, a novel 3D hierarchical architecture composed of TiO2/epitaxially aligned MoS2–carbon coupled interface nanosheets is reported for boosting sodium‐ion storage and lithium–sulfur batteries, in which the MoS2 nanosheets are epitaxially aligned grown on the surface of carbon nanosheets through a simple calculation conversion process. The resulting hybrid demonstrates ultralong‐life performance for sodium‐ion storage and lithium–sulfur batteries, owing to synergistic effects among the stable TiO2 nanowires, the high‐conductivity carbon nanosheets, and the vertical MoS2 nanostructure. Even at a high current density of 8 A g−1, the capacity can be maintained at 169 mA h g−1 after 15 000 cycles, one of the highest values for TiO2‐based electrodes. Moreover, such peculiar sheet‐on‐sheet structure also brings benefits for lithium–sulfur batteries, providing an effective physical shield against polysulfide shuttling and chemical adsorption of polysulfides, with a low fading rate (0.039% per cycle over 1500 cycles). The present work highlights that this rationally designed hybrid nanoarchitecture is an effective strategy to boost the stability of electrochemical energy storage.