Superior lithium-ion storage performances of SnO 2 powders consisting of hollow nanoplates

Jae Hun Choi, Seung Keun Park, Yun Chan Kang

Research output: Contribution to journalArticle

4 Citations (Scopus)

Abstract

Hierarchical structured transition metal oxides have attracted considerable attention as anode materials for lithium-ion batteries because they possess large surface area that can provide large contact area with the electrolyte and short diffusion distance for Li ions. Here, a hierarchical structured assembly of hollow SnO 2 nanoplates is synthesized by one-step oxidation of SnS 2 powders. The SnS 2 powders comprising of dense nanoplates synthesized by the hydrothermal method transform into SnO 2 powders comprising of hollow nanoplates by nanoscale Kirkendall diffusion at the oxidation temperature of 500 °C. After the transformation of SnS 2 into SnO 2 powders, the Brunauer-Emmett-Teller surface area of the powders increases from 22.8 to 82.7 m 2 g −1 . The hierarchical structured SnO 2 powders show superior lithium-ion storage performances compared to SnS 2 powders with the same structure. The discharge capacities of SnS 2 and SnO 2 powders at a current density of 1 A g −1 for the 300th cycle are 273 and 754 mA h g −1 , respectively. The SnO 2 powders show a high reversible capacity of 169 mA h g −1 even at an extremely high current density of 30 A g −1 . The outstanding electrochemical properties of the SnO 2 powders can be attributed to their unique morphological structure having hollow nanoplates and optimum crystallite size, which increases the contact area between the active materials and the electrolyte and the buffered stress caused by the volume expansion during cycling.

Original languageEnglish
Pages (from-to)380-389
Number of pages10
JournalJournal of Alloys and Compounds
Volume797
DOIs
Publication statusPublished - 2019 Aug 15

Keywords

  • Hydrothermal process
  • Kierkendall diffusion
  • Lithium-ion batteries
  • Nanostructured materials
  • Tin oxide

ASJC Scopus subject areas

  • Mechanics of Materials
  • Mechanical Engineering
  • Metals and Alloys
  • Materials Chemistry

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