Structural Optimization of Rod-like Mn ₂ SnO ₄ @C Derived from MOFs as an Anode Material for High-Performance Li-Ion Storage

The exceptional structure of metal–organic frameworks (MOFs) makes them a promising candidate for energy storage. One strategy for optimizing electrode materials involves incorporating similar structures into other materials. In this study, rod-shaped Mn2SnO4@C was synthesized using rod-shaped MOF Mn-BTC as a precursor with Sn source regulation. The rod-shaped structure effectively increases the contact area with the electrolyte and shortens the ion transport distance, thereby enhancing the electrochemical performance. Mn2SnO4@C exhibits a specific capacity of 608.3 mAh g–1 after 150 cycles at 0.1 A g–1 and maintains a specific capacity of 179.2 mAh g–1 even after 2000 cycles at 1 A g–1. The Mn2SnO4@C//AC lithium-ion capacitor assembled with Mn2SnO4@C as the anode exhibits a maximum energy density of 124.7 Wh kg–1 and a maximum power density of 20,000 W kg–1, achieving a maximum specific capacity of 44.5 mAh g–1 at 2 A g–1. The inheritance of MOF structures has effectively enhanced the performance of materials and devices while also providing new strategies for structural optimization of materials.