AUTHOR=Liu Li-Lai , Li Ming-Yang , Sun Yi-Han , Yang Xue-Ying , Ma Min-Xuan , Wang Hui , An Mao-Zhong 

TITLE=A Facile Microwave Hydrothermal Method for Fabricating SnO2@C/Graphene Composite With Enhanced Lithium Ion Storage Properties

JOURNAL=Frontiers in Chemistry

VOLUME=10

YEAR=2022

URL=https://www.frontiersin.org/journals/chemistry/articles/10.3389/fchem.2022.895749

DOI=10.3389/fchem.2022.895749

ISSN=2296-2646

ABSTRACT=<p>SnO<sub>2</sub>@C/graphene ternary composite material has been prepared via a double-layer modified strategy of carbon layer and graphene sheets. The size, dispersity, and coating layer of SnO<sub>2</sub>@C are uniform. The SnO<sub>2</sub>@C/graphene has a typical porous structure. The discharge and charge capacities of the initial cycle for SnO<sub>2</sub>@C/graphene are 2,210 mAh g<sup>−1</sup> and 1,285 mAh g<sup>−1</sup>, respectively, at a current density of 1,000 mA g<sup>−1</sup>. The Coulombic efficiency is 58.60%. The reversible specific capacity of the SnO<sub>2</sub>@C/graphene anode is 955 mAh g<sup>−1</sup> after 300 cycles. The average reversible specific capacity still maintains 572 mAh g<sup>−1</sup> even at the high current density of 5 A g<sup>−1</sup>. In addition, cyclic voltammetry (CV) and electrochemical impedance spectroscopy (EIS) are performed to further investigate the prepared SnO<sub>2</sub>@C/graphene composite material by a microwave hydrothermal method. As a result, SnO<sub>2</sub>@C/graphene has demonstrated a better electrochemical performance.</p>