Ultra-high Areal Capacity Realized in Three-Dimensional Holey Graphene/SnO2 Composite Anodes

Junfei Liang; Hongtao Sun; Zipeng Zhao; Yiliu Wang; Zhiying Feng; Jian Zhu; Lin Guo; Yu Huang; Xiangfeng Duan

doi:10.1016/j.isci.2019.08.025

Ultra-high Areal Capacity Realized in Three-Dimensional Holey Graphene/SnO₂ Composite Anodes

iScience. 2019 Sep 27:19:728-736. doi: 10.1016/j.isci.2019.08.025. Epub 2019 Aug 20.

Authors

Junfei Liang¹, Hongtao Sun², Zipeng Zhao³, Yiliu Wang⁴, Zhiying Feng⁴, Jian Zhu⁵, Lin Guo⁶, Yu Huang⁷, Xiangfeng Duan⁸

Affiliations

¹ Department of Materials Science and Engineering, University of California, Los Angeles, CA 90095, USA; Department of Chemistry and Biochemistry, University of California, Los Angeles, CA 90095, USA; School of Energy and Power Engineering, North University of China, Shanxi, Taiyuan 030051, P. R. China.
² Department of Chemistry and Biochemistry, University of California, Los Angeles, CA 90095, USA; Department of Industrial and Manufacturing Engineering, The Pennsylvania State University, University Park, PA 16802-4400, USA.
³ Department of Materials Science and Engineering, University of California, Los Angeles, CA 90095, USA.
⁴ Department of Chemistry and Biochemistry, University of California, Los Angeles, CA 90095, USA.
⁵ Department of Chemistry and Biochemistry, University of California, Los Angeles, CA 90095, USA; College of Chemistry and Chemical Engineering, Hunan University, Changsha 410082, China.
⁶ School of Chemistry, Beihang University, Beijing 100191, China. Electronic address: linguo@buaa.edu.cn.
⁷ Department of Materials Science and Engineering, University of California, Los Angeles, CA 90095, USA; California NanoSystems Institute, University of California, Los Angeles, CA 90095, USA. Electronic address: yhuang@seas.ucla.edu.
⁸ Department of Chemistry and Biochemistry, University of California, Los Angeles, CA 90095, USA; California NanoSystems Institute, University of California, Los Angeles, CA 90095, USA. Electronic address: xduan@chem.ucla.edu.

Abstract

Nanostructured alloy-type electrode materials and its composites have shown extraordinary promise for lithium-ion batteries (LIBs) with exceptional gravimetric capacity. However, studies to date are usually limited to laboratory cells with too low mass loading (and thus too low areal capacity) to exert significant practical impact. Herein, by impregnating micrometer-sized SnO₂/graphene composites into 3D holey graphene frameworks (HGF), we show that a well-designed 3D-HGF/SnO₂ composite anode with a high mass loading of 12 mg cm^-2 can deliver an ultra-high areal capacity up to 14.5 mAh cm^-2 under current density of 0.2 mA cm^-2 and stable areal capacity of 9.5 mAh cm^-2 under current density of 2.4 mA cm^-2, considerably outperforming those in the state-of-art research devices or commercial devices. This robust realization of high areal capacity defines a critical step to capturing the full potential of high-capacity alloy-type electrode materials in practical LIBs.

Keywords: Energy Materials; Energy Storage; Nanomaterials.