Enhanced Electrochemical Performance of Sn(SnO₂)/TiO₂(B) Nanocomposite Anode Materials with Ultrafast Charging and Stable Cycling for High-Performance Lithium-Ion Batteries

Nanostructured tin(tin oxide)/bronze-phase titanium dioxide (Sn(SnO2)/TiO2(B)) ultrafast-charging and good cycling stability materials have been intensively studied as potential electrode materials to improve battery performance. The Sn(SnO2)/TiO2(B) nanocomposites have been synthesized using a simple hydrothermal method and subsequent chemical technique. The unique phase hybridization of metallic Sn and SnO2 on the TiO2(B) nanorod surface enhances Li-ion storage performance throughout this nanocomposite design. Interestingly, the Sn(SnO2)/TiO2(B) electrode can operate effectively at high current density while sustaining an excellent rate capacity. Furthermore, this nanocomposite electrode also delivers a highly reversible specific capacity of 500 mAh g–1 at 100 mA g–1 and manifests a high Coulombic efficiency of around 98% after 50 cycles. Also, the Sn(SnO2)/TiO2(B) nanocomposite possessed excellent capacities of 188 mAh g–1 (at the rate of 10.0 A g–1) and 117 mAh g–1 (at the rate of 20.0 A g–1) after long-term cycling for 3000 cycles, indicating good cycling stability and ultrafast-charging characteristic. At ambient temperature, this electrode has a low transfer resistance of around 6.30 Ω and a high lithium-ion diffusion coefficient of roughly 5.05 × 10–13 cm2 s–1. This prepared electrode reveals the composite architecture, which contains the open continuous pseudocapacitive channels along its axis, allowing for fast lithium-ion diffusion and storage as well as effective mechanical support for the TiO2(B) nanorod, alleviating stress generated during discharge–charge cycling. Also, the generated stable SEI layer of this material can prevent the pulverization and separation of the Sn and SnO2 nanoparticles.Its superior properties of having a distinct structure, high storage capability, potential for ultrafast charging, safety in use, and good cycling stability indicate they can be promising and effective anode materials in better power batteries for next-generation applications.