Issue 34, 2015

One-pot pyrolysis of lithium sulfate and graphene nanoplatelet aggregates: in situ formed Li2S/graphene composite for lithium–sulfur batteries

Abstract

Lithium sulfide (Li2S) as a cathodic material in Li–S batteries can not only deliver a high theoretical specific capacity of 1166 mA h g−1, but also is essential for batteries using Li-free anode materials such as silicon and graphite. Various efforts have been made to synthesize a highly efficient Li2S–carbon composite; however, the electronically and ionically insulating nature and high melting point of Li2S strongly complicate the synthetic procedures, making it difficult to realize the expected capacity. Herein, a very simple method is proposed to prepare Li2S/graphene composites by one-pot pyrolysis of a mixture of graphene nanoplatelet aggregates (GNAs) and low-cost lithium sulfate (Li2SO4). For the first time, the entire pyrolysis process is clarified by thermogravimetry-mass spectrometry, wherein GNAs were found to partly serve as a carbon source to reduce Li2SO4 to Li2S, while the remaining GNAs formed thin graphene sheets as a result of this in situ etching, as a highly conductive host can immobilize the generated Li2S by intimate contact. Consequently, the obtained Li2S/graphene composite, combined with a Li2Sx-insoluble (x = 4–8) electrolyte developed by our group, exhibits excellent electrochemical behavior for Li–S batteries.

Graphical abstract: One-pot pyrolysis of lithium sulfate and graphene nanoplatelet aggregates: in situ formed Li2S/graphene composite for lithium–sulfur batteries

Supplementary files

Article information

Article type
Paper
Submitted
19 May 2015
Accepted
30 Jul 2015
First published
31 Jul 2015

Nanoscale, 2015,7, 14385-14392

Author version available

One-pot pyrolysis of lithium sulfate and graphene nanoplatelet aggregates: in situ formed Li2S/graphene composite for lithium–sulfur batteries

Z. Li, S. Zhang, C. Zhang, K. Ueno, T. Yasuda, R. Tatara, K. Dokko and M. Watanabe, Nanoscale, 2015, 7, 14385 DOI: 10.1039/C5NR03201F

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