Catalyst engineering for lithium ion batteries: The catalytic role of Ge in enhancing the electrochemical performance of SnO2(GeO2)0.13/G anodes

Yun Guang Zhu, Ye Wang, Zhao Jun Han, Yumeng Shi, Jen It Wong, Zhi Xiang Huang, Kostya Ostrikov, Hui Ying Yang*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

25 Scopus citations

Abstract

The catalytic role of germanium (Ge) was investigated to improve the electrochemical performance of tin dioxide grown on graphene (SnO2/G) nanocomposites as an anode material of lithium ion batteries (LIBs). Germanium dioxide (GeO2) and SnO2 nanoparticles (<10 nm) were uniformly anchored on the graphene sheets via a simple single-step hydrothermal method. The synthesized SnO2(GeO2)0.13/G nanocomposites can deliver a capacity of 1200 mA h g-1 at a current density of 100 mA g-1, which is much higher than the traditional theoretical specific capacity of such nanocomposites (∼702 mA h g-1). More importantly, the SnO2(GeO2)0.13/G nanocomposites exhibited an improved rate, large current capability (885 mA h g-1 at a discharge current of 2000 mA g-1) and excellent long cycling stability (almost 100% retention after 600 cycles). The enhanced electrochemical performance was attributed to the catalytic effect of Ge, which enabled the reversible reaction of metals (Sn and Ge) to metals oxide (SnO2 and GeO2) during the charge/discharge processes. Our demonstrated approach towards nanocomposite catalyst engineering opens new avenues for next-generation high-performance rechargeable Li-ion batteries anode materials. This journal is

Original languageEnglish (US)
Pages (from-to)15020-15028
Number of pages9
JournalNanoscale
Volume6
Issue number24
DOIs
StatePublished - Dec 21 2014

ASJC Scopus subject areas

  • Materials Science(all)

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