Preparation and electrochemical performance of Cu₆Sn₅/CNTs anode materials for lithium-ion batteries

Facile One-Step Preparation of 3D Nanoporous Cu/Cu6Sn5 Microparticles as Anode Material for Lithium-Ion Batteries with Superior Lithium Storage Properties

“…In the anodic sweep processes, the distinct oxidation peaks appear at 0.87 V and 0.67 V, which are attributed to multistep de-lithiation of Li 4.4 Sn described by Equation ( 3). [40,43] After the first cycle, active tin participates in subsequent cycles described by Equation (3) and Equation ( 4) and the excellent electrochemical reversibility is demonstrated by the good coincidence of the curves. gradually.…”

“…The reduction peaks at 1.63 V and 1.19 V during the first cathodic scan can be put down to the reduction of some oxides and the formation of solid electrolyte interface (SEI) layer on the surface of the electrode, respectively. [40] A reduction peak appears at 0.55 V, which is assigned to the intercalation process of Li into Cu 6 Sn 5 to form Li 2 CuSn and Cu described by Equation ( 1), [41,42] and disappears in subsequent cycles, indicating that the intercalation process only happens in first cycle. After that, a gentle peak at 0.34 V and a distinct peak below 0.2 V are observed, involving step-by-step lithiation processes to finally form Li 4.4 Sn described by Equation ( 2).…”