SiOx Encapsulated in Graphene Bubble Film: An Ultrastable Li-Ion Battery Anode

Quan Xu; Jian-Kun Sun; Zhi-Long Yu; Ya-Xia Yin; Sen Xin; Shu-Hong Yu; Yu-Guo Guo

doi:10.1002/adma.201707430

SiO_x Encapsulated in Graphene Bubble Film: An Ultrastable Li-Ion Battery Anode

Adv Mater. 2018 Jun;30(25):e1707430. doi: 10.1002/adma.201707430. Epub 2018 May 10.

Authors

Quan Xu^{1

2}, Jian-Kun Sun^{1

2}, Zhi-Long Yu³, Ya-Xia Yin^{1

2}, Sen Xin¹, Shu-Hong Yu³, Yu-Guo Guo^{1

2}

Affiliations

¹ CAS Key Laboratory of Molecular Nanostructure and Nanotechnology, CAS Research/Education Center for Excellence in Molecular Sciences, Institute of Chemistry, Chinese Academy of Sciences (CAS), Beijing, 100190, P. R. China.
² University of Chinese Academy of Sciences, Beijing, 100049, P. R. China.
³ Hefei National Laboratory for Physical Sciences at the Microscale, Department of Chemistry, University of Science and Technology of China, Hefei, 230026, China.

PMID: 29744940
DOI: 10.1002/adma.201707430

Abstract

SiO_x is proposed as one of the most promising anodes for Li-ion batteries (LIBs) for its advantageous capacity and stable Li uptake/release electrochemistry, yet its practical application is still a big challenge. Here encapsulation of SiO_x nanoparticles into conductive graphene bubble film via a facile and scalable self-assembly in solution is shown. The SiO_x nanoparticles are closely wrapped in multilayered graphene to reconstruct a flake-graphite-like macrostructure, which promises uniform and agglomeration-free distribution of SiO_x in the carbon while ensures a high mechanical strength and a high tap density of the composite. The composites present unprecedented cycling stability and excellent rate capabilities upon Li storage, rendering an opportunity for its anode use in the next-generation high-energy LIBs.

Keywords: Li-ion batteries; SiOx@graphene; bubble film; ultrastable anode.