Molecular Engineering of Monodisperse SnO2 Nanocrystals Anchored on Doped Graphene with High‐Performance Lithium/Sodium‐Storage Properties in Half/Full Cells

By Heng‐guo Wang, Qiong Wu, Yinghui Wang, Xiao Wang, Lanlan Wu, Shuyan Song, Hongjie Zhang. Advanced Energy Materials, 2018

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The fabrication of ultrasmall and high‐content SnO2 nanocrystals anchored on doped graphene can endow SnO2 with superior electrochemical properties. Herein, an effective strategy, involving molecular engineering of a layer‐by‐layer assembly technique, is proposed to homogeneously anchor SnO2 nanocrystals on nitrogen/sulfur codoped graphene (NSGS), which serves as an advanced anode material in lithium/sodium‐ion batteries (LIBs/SIBs). Benefiting from novel design and specific structure, the optimized NSGS for LIBs displays high initial capacity (2123.9 mAh g−1 at 0.1 A g−1), long‐term cycling performance (only 0.8% loss after 500 cycles), and good rate capability (477.4 mAh g−1 at 5 A g−1). In addition, the optimized NSGS for SIBs also delivers high initial capacity (791.7 mAh g−1 at 0.1 A g−1) and high reversible capacity (180.2 mAh g−1 after 500 cycles at 0.5 A g−1). Meanwhile, based on the detailed analysis of phase transition and electrochemical reaction kinetics, the reaction mechanisms of NSGS in LIBs and SIBs as well as the distinction in LIBs/SIBs are clearly articulated. Notably, to further explore the practical application, Li/Na+ full cells are also assembled by coupling the optimized NSGS anode with LiCoO2 and Na3V2(PO4)3/C cathodes, respectively.

Subfields: Electrical and Electronic Engineering, Electronic, Optical and Magnetic Materials

View Paper: https://www.semanticscholar.org/paper/635925cbf98e1850be2dabddadaf1596d1d7216b