Enhanced Electrochemical Performance Of Co1-Xs/C And 3d Network-Like Co9s8@C Anode Materials For Lithium-Ion Batteries

The combination of cobalt sulfide and carbon can effectively stabilize the structure of the anode material and reduce the capacity decay. Co1-xS/C anode material was synthesized by two-step method of solvothermal and solid-phase sintering, in which cobalt chloride hexahydrate, selenourea and glucose are cobalt, sulfur and carbon sources, respectively. The discharge specific discharge capacity of Co1-xS/C anode material is stable at 216.7 mAh g(-1) at 50 mA g(-1) after 100 cycles. The 3D network-like Co9S8@C anode material was synthesized by solid-phase template method. The precursor (Co-based Metal organic Frameworks) template was prepared using cobaltous nitrate hexahydrate and terephthalic acid as cobalt source and organic ligand, respectively. Co9S8@C anode material is a network structure composed of uniformly sized spherical particles, which has the characteristics of high specific surface area and high porosity. The discharge specific capacity at the 10th cycle is as high as 1246.2 mAh g(-1) at 50 mA g(-1). After 100 cycles, the capacity decays to 1032.6 mAh g(-1), and the capacity retention rate is 82.85%.