B,N-Co-doped Graphene Supported Sulfur for Superior Stable Li-S Half Cell and Ge-S Full Battery

Wenlong Cai; Jianbin Zhou; Gaoran Li; Kailong Zhang; Xianyu Liu; Can Wang; Heng Zhou; Yongchun Zhu; Yitai Qian

doi:10.1021/acsami.6b08852

B,N-Co-doped Graphene Supported Sulfur for Superior Stable Li-S Half Cell and Ge-S Full Battery

ACS Appl Mater Interfaces. 2016 Oct 19;8(41):27679-27687. doi: 10.1021/acsami.6b08852. Epub 2016 Oct 11.

Authors

Wenlong Cai¹, Jianbin Zhou¹, Gaoran Li², Kailong Zhang¹, Xianyu Liu¹, Can Wang², Heng Zhou², Yongchun Zhu¹, Yitai Qian¹

Affiliations

¹ Hefei National Laboratory for Physical Science at Microscale and Department of Chemistry, University of Science and Technology of China , Hefei, Anhui 230026, China.
² Key Laboratory of Biomass Chemical Engineering of Ministry of Education, College of Chemical and Biological Engineering, Zhejiang University , Hangzhou 310027, China.

PMID: 27696811
DOI: 10.1021/acsami.6b08852

Abstract

B,N-Co-doped graphene supported sulfur (S@BNG) composite is synthesized by using melamine diborate as precursor. XPS spectra illustrates that BNG with a high percentage and dispersive B, N (B = 13.47%, N = 9.17%) and abundant pyridinic-N and N-B/N═B bond, show strong interaction with Li₂S_x proved by adsorption simulation experiments. As cathode for Li-S half cell, S@BNG with a sulfur content of 75% displays a reversible capacity of 765 mA h g^-1 at 1 C even after 500 cycles (a low fading rate of 0.027% per cycle). Even at a high sulfur loading of 4.73 mg cm^-2, S@BNG still shows a high and stable areal capacity of 3.5 mA h cm^-2 after 48 cycles. When S@BNG composite as cathode combines with high performance lithiated Ge anode (discharge capacity of 1138 mA h g^-1 over 1000 cycles at 1 C in half cell), the assembled Ge-S full battery exhibits a superior capacity of 530 mA h g^-1 over 500 cycles at the rate of 1 C.

Keywords: B; Ge−S full battery; N-co-doped graphene; high content of heteroatoms; nano Ge; strong chemisorption.