Ultrasmall MoS3 Loaded GO Nanocomposites as High‐Rate and Long‐Cycle‐Life Anode Materials for Lithium‐ and Sodium‐Ion Batteries

MoS3 is a promising anode material due to its high theoretical capacity (838 mAh g−1), high conductivity, low cost, and environmental friendliness. However, the big volume changes upon cycling can induce particle pulverization, leading to a poor cycling performance, especially at high rates. Herein, nanocomposites of amorphous ultrasmall MoS3 nanoparticles and loaded graphene oxide (GO/MoS3) have been prepared via a facile acid precipitation method. Three nanocomposites were obtained by changing the amounts of GO. They were employed as anode materials for both lithium‐ and sodium‐ion batteries. Using GO as the buffer layer, the volume changes can be effectively suppressed. The material exhibits better lithium‐ and sodium‐storage performances than pure MoS3. An optimized nanocomposite containing 30 mg of GO shows the highest specific capacity of 685 mAh g−1 after 1000 cycles, even at 2 A g−1. Different from lithium‐ion batteries, the nanocomposite containing 50 mg of GO demonstrates a superior cycling stability in sodium‐ion batteries in comparison with the other nanocomposites. It delivers a high reversible specific capacity of 272 mAh g−1 after 700 cycles at 1 A g−1. The excellent electrochemical performances of these nanocomposites could be attributed to the synergistic effect of GO and MoS3.