title: Confined SnO2 quantum-dot clusters in graphene sheets as high-performance anodes for lithium-ion batteries.
abstract: Construction of metal oxide nanoparticles as anodes is of special interest for next-generation lithium-ion batteries. The main challenge lies in their rapid capacity fading caused by the structural degradation and instability of solid-electrolyte interphase (SEI) layer during charge/discharge process. Herein, we address these problems by constructing a novel-structured SnO2-based anode. The novel structure consists of mesoporous clusters of SnO2 quantum dots (SnO2 QDs), which are wrapped with reduced graphene oxide (RGO) sheets. The mesopores inside the clusters provide enough room for the expansion and contraction of SnO2 QDs during charge/discharge process while the integral structure of the clusters can be maintained. The wrapping RGO sheets act as electrolyte barrier and conductive reinforcement. When used as an anode, the resultant composite (MQDC-SnO2/RGO) shows an extremely high reversible capacity of 924 mAh g(-1) after 200 cycles at 100 mA g(-1), superior capacity retention (96%), and outstanding rate performance (505 mAh g(-1) after 1000 cycles at 1000 mA g(-1)). Importantly, the materials can be easily scaled up under mild conditions. Our findings pave a new way for the development of metal oxide towards enhanced lithium storage performance.
authors.affiliation: State Key Laboratory of Metal Matrix Composites, Shanghai Jiao Tong University, Shanghai 200240, P. R. China.
authors.forename: Chengling
authors.initials: C
authors.lastname: Zhu
authors.affiliation: State Key Laboratory of Metal Matrix Composites, Shanghai Jiao Tong University, Shanghai 200240, P. R. China.
authors.forename: Shenmin
authors.initials: S
authors.lastname: Zhu
authors.affiliation: State Key Laboratory of Metal Matrix Composites, Shanghai Jiao Tong University, Shanghai 200240, P. R. China.
authors.forename: Kai
authors.initials: K
authors.lastname: Zhang
authors.affiliation: State Key Laboratory of Metal Matrix Composites, Shanghai Jiao Tong University, Shanghai 200240, P. R. China.
authors.forename: Zeyu
authors.initials: Z
authors.lastname: Hui
authors.affiliation: State Key Laboratory of Metal Matrix Composites, Shanghai Jiao Tong University, Shanghai 200240, P. R. China.
authors.forename: Hui
authors.initials: H
authors.lastname: Pan
authors.affiliation: School of Mechanical, Materials &Mechatronics Engineering, University of Wollongong, Wollongong, NSW 2522, Australia.
authors.forename: Zhixin
authors.initials: Z
authors.lastname: Chen
authors.affiliation: State Key Laboratory of Metal Matrix Composites, Shanghai Jiao Tong University, Shanghai 200240, P. R. China.
authors.forename: Yao
authors.initials: Y
authors.lastname: Li
authors.affiliation: State Key Laboratory of Metal Matrix Composites, Shanghai Jiao Tong University, Shanghai 200240, P. R. China.
authors.forename: Di
authors.initials: D
authors.lastname: Zhang
authors.affiliation: School of Chemical Engineering, UNSW Australia, UNSW Sydney, NSW 2052, Australia.
authors.forename: Da-Wei
authors.initials: DW
authors.lastname: Wang