Graphitic Nanocarbon-Selenium Cathode with Favorable Rate Capability for Li-Se Batteries

Shuai-Feng Zhang; Wen-Peng Wang; Sen Xin; Huan Ye; Ya-Xia Yin; Yu-Guo Guo

doi:10.1021/acsami.6b16708

Graphitic Nanocarbon-Selenium Cathode with Favorable Rate Capability for Li-Se Batteries

ACS Appl Mater Interfaces. 2017 Mar 15;9(10):8759-8765. doi: 10.1021/acsami.6b16708. Epub 2017 Mar 3.

Authors

Shuai-Feng Zhang^{1

2}, Wen-Peng Wang^{1

2}, Sen Xin¹, Huan Ye^{1

2}, Ya-Xia Yin^{1

2}, Yu-Guo Guo^{1

2}

Affiliations

¹ CAS Key Laboratory of Molecular Nanostructure and Nanotechnology, and Beijing National Laboratory for Molecular Sciences, Institute of Chemistry, Chinese Academy of Sciences (CAS) , Beijing 100190, P. R. China.
² School of Chemistry and Chemical Engineering, University of Chinese Academy of Sciences , Beijing 100049, P. R. China.

PMID: 28230341
DOI: 10.1021/acsami.6b16708

Abstract

A well-organized selenium/carbon nanosheets nanocomposite(Se/CNSs) is prepared by confining chain-like Se_n molecules in hierarchically micromesoporous carbon nanosheets. A unique two-dimensional morphology and high graphitization degree of carbon nanosheets benefits fast Li⁺/e^- access to the active Se, which guarantees a high utilization of Se during the(de)lithiation process. Besides, the chain-like Se molecules confined in the carbon matrix could alleviate the shuttle effect of polyselenides and promise a stable electrochemistry. Therefore, the resultant Se/CNSs delivers a highly reversible capacity, a long cycle life and favorable rate capabilities. Furthermore, a Li-Se pouch cell built from a metallic Li anode and the as-prepared Se/CNSs cathode exhibits an excellent electrochemical performance, demonstrating the potential of Se/CNSs in serving future energy storage devices with high energy density.

Keywords: Li−Se batteries; Se cathode; chain-like Se molecules; graphitic carbon; high-rate capability.