3D Metal‐Rich Cu_7.2S₄/Carbon‐Supported MoS₂ Nanosheets for Enhanced Lithium‐Storage Performance

Abstract

MoS 2 exhibits a high theoretical capacity and has been widely studied as an anode candidate for high-performance lithiumion batteries (LIBs). However, unmodified MoS 2 suffers from inherently poor conductivity and poor cycle stability because of the lamellar stack. Herein, a novel core-shell nanocomposite material (Cu 7.2 S 4 /C@MoS 2 ) was obtained to significantly improve the electrochemical performance of MoS 2 , where ultra-thin MoS 2 nanosheets were uniformly grown on a three-dimensional (3D) metal-rich Cu 7.2 S 4 /C support by a simple hydrothermal reaction. When employed as an anode for LIBs, the discharge capacity of the 3D core-shell Cu 7.2 S 4 /C@MoS 2 nanocomposite reached 1527.4 mAh g À 1 after 340 cycles at a high current density of 1 A g À 1 , which is much higher than that of pure MoS 2 nanosheets. The excellent electrochemical performance of the nanocomposite demonstrates its potential application in batteries.

Current material design strategies on the copper chalcogenide cathodes for rechargeable magnesium batteries: a review

“…In fact, as a typical non-stoichiometric phase, the crystal structure of the Cu 7.2 S 4 phase is significantly different from the typical CuS phase. When served as an electrode for rechargeable lithium batteries, 83 the excellent electrochemical properties for lithium storage could be ascribed to the unique one-dimensional chain-like crystal structure (Fig. 6c).…”

The Review of Hybridization of Transition Metal-Based Chalcogenides for Lithium-Ion Battery Anodes

“…Compared to pure CuO materials, the specific CuO@ZnO-6.5% anodes showed much superior electrochemical performance [ 68 ]. Cu 7.2 S 4 /C was introduced to form the core-shell Cu 7.2 S 4 /C@MoS 2 nanocomposites, which exhibited long-cycle stability and high specific discharge capacity owing to the special oxidation states of Cu and the improved conductivity by the Cu-rich Cu 7.2 S 4 component [ 69 ]. ZnO was introduced to suppress the agglomeration and migration of Cu 2 O or Cu particles during the carbonization process, and the molar ratios of Zn to Cu can directly affect the size of the bimetallic oxides.…”