Tin is regarded as a promising anode material for lithium-ion batteries due to its abundant reserves and relatively high theoretical capacity of 994 mAh/g. However, its practical application is hindered by severe volume expansion during lithiation and delithiation processes. Therefore, a hierarchically structured CoCu2Sn/CoSn2/ Cu2O composite was synthesized on copper foam via constant-current electrodeposition followed by annealing at 400 degrees C under argon atmosphere in this work. This electrode was composed of square-shaped Cu2O particles and fine CoCu2Sn/CoSn2 particles around it, exhibiting high electrical conductivity and notable pseudocapacitive contribution. The reversible capacity of the electrode is 808 mAh/g after 300 cycles at 0.5C and 670 mAh/g after 800 cycles at 1C. The microstructure of the post-cycling electrode remains stable, and a dense interface protective layer is formed without active material detachment. This performance enhancement is attributed to the unique hierarchical structure composed of CoCu2Sn/CoSn2 intermetallic compounds, which effectively slows down volume changes and the in-situ formation of Cu nanoparticles, thereby effectively maintaining the stability of microstructure and interfaces as well as high electrical conductivity during the cycling process.
[1]Kunming Univ Sci & Technol, Fac Mat Sci & Engn, Yunnan Kay Lab Integrated Computat Mat Engn Adv Li, Kunming 650093, Peoples R China.
[2]Kunming Met Coll, Kunming 650031, Peoples R China.
[3]Kunming Univ Sci & Technol, City Coll, Kunming 650050, Peoples R China.
[4]Kunming Univ Sci & Technol, Res Ctr Anal & Measurement, Kunming 650093, Peoples R China.
(8.0+极速模式)