Three-dimensional carbon framework encapsulated Sn-MOF derived Li2SnO3 as an anode material for high performance Li-ion battery

Abstract

This study presents a facile synthesis strategy for a high-performance Li₂SnO₃/three-dimensional carbon (3DC) composite anode for lithium-ion battery. A precursor mixture containing Sn-based metal–organic-framework (Sn-MOF) is transformed into a hierarchical architecture featuring uniformly distributed Li₂SnO₃ nanoparticles embedded within a robust 3DC matrix. The engineered 3DC framework exhibits dual functionality: suppressing Li₂SnO₃ particles agglomeration and buffering volume fluctuations during lithiation/delithiation, thereby significantly enhancing structural stability and electronic conductivity. Electrochemical evaluations demonstrate exceptional performance, with Li₂SnO₃/3DC delivering a reversible capacity of 699.9 mAh g⁻¹ after 800 cycles at 0.5 A g⁻¹ and maintaining 346.2 mAh g⁻¹ at 2 A g⁻¹. The superior rate capability and pseudocapacitive contribution are attributed to accelerated charge transport kinetics enabled by the conductive 3D carbon network. This work not only demonstrates a promising anode design for next-generation lithium-ion batteries but also provides critical insights into the synergistic integration of MOF-derived precursors and sacrificial templating for advanced energy storage materials.