| 초록 |
Lithiation–delithiation reactions in Li-ion batteries are often accompanied by an electrochemically driven huge volume changes of anode materials between the lithium-free and lithiated-host states, resulting in a gradual capacity fading. Minimizing the volume changes of electrode during cycling is essential to guarantee the electrochemical behaviors and go far in innovating design of electrode materials for Li storage. Here, we develop ordered mesoporous CoSn intermetallic anode materials with various Co/Sn atomic ratios, to prove a dual-buffer effect for accommodating the volume changes by not only the generation of repeated void nano-spaces but also the incorporation of electrochemically inactive element. We also provide novel insights into the nanostructural changes of electrode materials during lithiation–delithiation process by in operando small angle X-ray scattering investigations. The degrees of volume change and nanoscopic order are highly dependent on the Co contents in the mesoporous CoSn intermetallic anode materials, being possible to achieve a durable nanostructured electrode upon prolonged cycling. |
