Abstract:The commercially available graphite anodes, which are widely used today, can no longer meet the demand for future high-energy-density batteries due to their relatively low theoretical specific capacity. Therefore, developing new anode materials with higher specific capacity has become an urgent task. Tin-based materials, with their high theoretical specific capacity and low lithium intercalation potential, are considered one of the most promising next-generation anode materials for lithium-ion batteries. However, the significant volume expansion that occurs during the delithiation/lithiation process in tin-based materials often damages the electrode structure, leading to rapid battery capacity degradation. To address this issue, this study successfully synthesized a nanoporous Cu/Co3Sn2/Sn anode with a nanoporous structure through chemical dealloying and electrochemical deposition techniques. The nanoporous structure provided abundant pore space, which effectively buffered the stress during volume expansion and enhanced electrolyte infiltration. Meanwhile, in Sn-Co active-inert system, the inert component Co could suppress the volume change of Sn during the delithiation/lithiation process, ensuring the mechanical stability of the electrode during cycling. Furthermore, the design of the entire electrode eliminated the need for binders and conductive agents, reducing side electrochemical reactions. As a result, the designed anode material exhibited excellent electrochemical performance. At a current density of 1 A/g, Cu/Co3Sn2/Sn-100 anode electrode achieved an initial reversible capacity of 591 mAh/g, with a first-cycle Coulombic efficiency exceeding 91%. Even after 400 cycles, its capacity remained at 367 mAh/g, with a capacity retention rate of 65.7%.