Ultrahigh Reversibility of SnO2 in SnO2@C Quantum Dots/Graphene Oxide Nanosheets for Lithium Storage. Issue 35 (19th December 2017)

• Record Type: Journal Article
• Authors: Zhang, Pinjie; Wu, Xianbin; Zhao, Yiming; Wang, Lianbang; Su, Liwei; Wang, Yuanhao; Ren, Manman
• Is Part Of: ChemistrySelect. Volume 2:Issue 35(2017)
• Page Start: 11853
• Page End: 11859
• Publication Date: 2017-12-19
• Subjects: Coulombic efficiency -- core-shell structure -- graphene -- lithium ion batteries -- oxygen reutilization; Chemistry -- Periodicals; 540.5
• DOI: 10.1002/slct.201702734
• Languages: English
• ISSNs: 2365-6549

Abstract

Abstract: Among promising substitutions for commercial graphite anodes for lithium ion batteries, SnO2 has a fourfold theoretical capacity of graphite (if the O element is completely reversible), while the oxygen reutilization is seriously hampered by poor conductivity of both the electron and Li + ions. This work proposes a novel ternary architecture of SnO2 @C quantum dots (QDs, with average diameter of 3.37 nm) grafted on graphene oxides, denoted as SnO2 @C/G, via a facile and scalable one‐pot hydrothermal method. The SnO2 @C/G show extraordinary long‐term cycling performance (1080 mAh g −1 at 200 mA g ‐1 after 300 cycles) and rate capability (∼840 mAh g −1 at 2 A g −1 ). If excluding the contribution of carbon, the specific capacity of SnO2 is 1447 mAh g −1 at 200 mA g ‐1, 96.9% of its theoretical capacity. The extraordinary performance is ascribed to ultrahigh reversibility of SnO2 QDs, good structural stability, and much better ionic/electronic diffusions confirmed by XPS, TEM, EIS, respectively. Abstract : A novel ternary structure of core‐shell SnO2 @C quantum dots (3‐5 nm in diameter) on grapheme oxide nanosheets via a facile and scalable one‐pot hydrothermal route. The obtained hybrid exhibits a highly reversible capacity (1447 mAh g −1 ) of SnO2, close to its theoretical capacity. XPS spectrum after 300 cycles verifies good recoverability of SnO2 .