| 초록 |
Ordered mesoporous CoSn intermetallic (CoxSny) materials with various Co/Sn atomic ratios are are successfully synthesized for the first time through nano-replication technique as stable and high high-power anode materials for Li-ion battery. The electrochemical results show that reversible capacity, Coulombic efficiency and cycle stability of mesoporous CoxSny materials are dependent on their structure and composition. Especially, the ordered mesoporous Co0.3Sn0.7 material shows exhibits 83% capacity retention after 50th cycle, which means that mesoporosity as well as Co atoms incorporation effectively accommodate the volume strain during lithiation–delithiation processes. Rate performance of mesoporous Co0.3Sn0.7 anode is also significantly improved, which was is deeply probably related to the kinetic behaviors such as low polarization resistance and large diffusion coefficient. Electron microscopy and small angle X-ray scattering investigations have proved our understating of the sustainable pore system and the effectivity of mesostructure. |
