MoS₂‐Quantum‐Dot‐Interspersed Li₄Ti₅O₁₂ Nanosheets with Enhanced Performance for Li‐ and Na‐Ion Batteries

Abstract

Rational nanoscale surface engineering of electroactive nanoarchitecture is highly desirable, since it can both secure high surface‐controlled energy storage and sustain the structural integrity for long‐time and high‐rate cycling. Herein, ultrasmall MoS 2 quantum dots (QDs) are exploited as surface sensitizers to boost the electrochemical properties of Li 4 Ti 5 O 12 (LTO). The LTO/MoS 2 composite is prepared by anchoring 2D LTO nanosheets with ultrasmall MoS 2 QDs using a simple and effective assembly technique. Impressively, such 0D/2D heterostructure composites possess enhanced surface‐controlled Li/Na storage behavior. This unprecedented Li/Na storage process provides a LTO/MoS 2 composite with outstanding Li/Na storage properties, such as high capacity and high‐rate capability as well as long‐term cycling stability. As anodes in Li‐ion batteries, the materials have a stable specific capacity of 170 mAhg −1 after 20 cycles and are able to retain 94.1% of this capacity after 1000 cycles, i.e., 160 mAhg −1 , at a high rate of 10 C. Due to these impressice performance, the presented 0D/2D heterostructure has great potential in high‐performance LIBs and sodium‐ion batteries.