A robust solvothermal-driven solid-to-solid transition route from micron SnCO to tartaric acid-capped nano-SnO anchored on graphene for superior lithium and sodium storage

• Published in: Journal of materials chemistry. A, Materials for energy and sustainability Materials for energy and sustainability, 2022-12, Vol.11 (1), p.53-67
• Main Authors: Xie, Furong, Zhao, Shiqiang, Bo, Xiaoxu, Li, Guanghui, Fei, Jiamin, Ahmed, Ebrahim-Alkhalil M. A, Zhang, Qingcheng, Jin, Huile, Wang, Shun, Lin, Zhiqun
• Format: Article
• ISSN: 2050-7488; 2050-7496
• DOI: 10.1039/d2ta07435d

Tin dioxide (SnO 2 ) has been widely implemented as an advanced anode material for lithium or sodium ion batteries (LIBs/SIBs) owing to its high capacity and moderate potential. However, conventional synthetic approaches often yield large-sized SnO 2 , which suffers from low conductivity, huge volume expansion and Sn coarsening issues, hampering its practical implementation. Herein, a unique solvothermal-driven solid-to-solid transition (SDSST) strategy is developed to craft tartaric acid (TA) capped ultrafine SnO 2 nanoparticles (NPs) in situ on sacrificial SnC 2 O 4 microrods. Ball-milling combined with solvent evaporation treatment realizes the homogeneous composition and precise mass ratio control of TA-capped SnO 2 NPs and reduced graphene oxide (rGO). Remarkably, the SnO 2 NPs-rGO nanocomposite manifests outstanding lithium and sodium storage capacities of 1775 and 463 mA h g −1 after 800 and 100 cycles at 1000 and 20 mA g −1 , respectively, and an ultralong lifespan of 4000 cycles for LIBs. Notably, systematic electrochemical and componential characterization of the cycled electrodes reveals that SnO 2 NPs-rGO manifests fully reversible three-step lithiation-delithiation reactions of SnO 2 and a primary highly reversible sodiation-desodiation conversion reaction between Sn and SnO combined with a secondary partially reversible alloying-dealloying reaction between Sn and Na x Sn (0 ≤ x ≤ 3.75) for lithium and sodium storage, respectively. The even encapsulation of TA-capped SnO 2 NPs in the rGO matrix enables effectively suppressed volume expansion for outstanding structural stability, significantly accelerated ion/electron transport for superior reaction kinetics, greatly prohibited Sn coarsening for enhanced cycle reversibility, and dramatically increased capacitive capacity for additional energy storage. As such, the SDSST approach may represent a facile yet robust strategy for crafting a variety of nanomaterials of interest with appropriate metastable solids as the precursor under the assistance of efficient capping agents. A robust solvothermal-driven solid-to-solid transition strategy is developed to craft tartaric acid-capped ultrafine SnO 2 encapsulated in graphene with outstanding lithium and sodium storage reversibility due to effectively inhibited Sn coarsening.