One-pot method for synthesizing spherical-like metal sulfide-reduced graphene oxide composite powders with superior electrochemical properties for lithium-ion batteries

Gi Dae Park, Seung Ho Choi, Jung Kul Lee, Yun Chan Kang

Research output: Contribution to journalArticle

28 Citations (Scopus)

Abstract

A facile, one-pot method for synthesizing spherical-like metal sulfide-reduced graphene oxide (RGO) composite powders by spray pyrolysis is reported. The direct sulfidation of ZnO nanocrystals decorated on spherical-like RGO powders resulted in ZnS-RGO composite powders. ZnS nanocrystals with a size below 20 nm were uniformly dispersed on spherical-like RGO balls. The discharge capacities of the ZnS-RGO, ZnO-RGO, bare ZnS, and bare ZnO powders at a current density of 1000 mAg-1 after 300 cycles were 628, 476, 230, and 168 mAhg-1, respectively, and the corresponding capacity retentions measured after the first cycles were 93, 70, 40, and 21%, respectively. The discharge capacity of the ZnS-RGO composite powders at a high current density of 4000 mAg-1 after 700 cycles was 437 mAhg-1. The structural stability of the highly conductive ZnS-RGO composite powders with ultrafine crystals during cycling resulted in excellent electrochemical properties.

Original languageEnglish
Pages (from-to)12183-12189
Number of pages7
JournalChemistry - A European Journal
Volume20
Issue number38
DOIs
Publication statusPublished - 2014 Sep 15

    Fingerprint

Keywords

  • energy conversion
  • energy-storage materials
  • nanostructures
  • reduced graphene oxides
  • synthesis design

ASJC Scopus subject areas

  • Chemistry(all)

Cite this