Facile Nanostructured Composite Synthesis of Selenium and Molybdenum Chalcogenides/Carbon Nanotubes for Li‐Ion Batteries

Abstract

For lithium‐ion batteries (LIBs), MoS2, which has conversion reaction pathways that can accommodate lithium ions during charge, is a very special inorganic material that has a two‐dimensional planar structure similar to graphite. For reliable performance of high‐energy LIBs, Se–molybdenum chalcogenides with sulfide and selenide (Se–MC) were prepared via the incorporation of a carbon nanotube (CNT) conducting matrix to solve the crucial limitations of MoS2, which include poor electronic conductivity and severe volume changes during cycling. For the preparation of Se–MC/CNT, a facile, one‐pot synthetic method using molybdic acid, selenium dioxide, and thioacetamide, which are the precursors for molybdenum, selenide, and sulfide, respectively, and CNT was developed. A detailed investigation of the surfaces and crystal structures of the prepared samples was conducted using transmission electron microscopy and X‐ray photoelectron spectroscopy analyses. Furthermore, LIBs containing the Se–MC/CNT exhibited a significantly extended cycle life and an improved rate capability that revealed the synergetic effect of the CNTs and selenide for controlling the morphology.

Enhanced Electrochemical Properties of γ‐MnS@rGO Composite as Anodes for Lithium‐Ion Batteries

“…[6] In recent years, metal sulfides have attracted attention as potential anode materials for LIBs due to their high theoretical capacity from intrinsic redox reactions (intercalation, conversion, and alloying) capable of delivering high specific capacity. [7][8][9][10][11] Manganese sulfide (MnS), a type of metal sulfide, possesses a high theoretical capacity (616 mAh g À 1 ), low cost, and environmental friendliness. [12,13] However, there are still challenges, including poor electrochemical stability and volume expansion, that need to be addressed for the practical application of MnS for LIBs.…”

“…Therefore, it is necessary to develop new anode materials with a high specific capacity [6] . In recent years, metal sulfides have attracted attention as potential anode materials for LIBs due to their high theoretical capacity from intrinsic redox reactions (intercalation, conversion, and alloying) capable of delivering high specific capacity [7–11] . Manganese sulfide (MnS), a type of metal sulfide, possesses a high theoretical capacity (616 mAh g −1 ), low cost, and environmental friendliness [12,13] .…”