Electrochemical Performance of GeO2/C Core Shell based Electrodes for Li-ion Batteries

Duc Tung Ngo, Ramchandra S. Kalubarme, M. G. Chourashiya, Choong Nyeon Park, Chan Jin Park*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

21 Scopus citations

Abstract

In the present study, a nanocrystalline GeO2/C core shell was synthesized by a cost-effective and simple citric-gel method for various parameters, and the effects of these parameters on the microstructural and electrochemical properties of the GeO2/C core shell were investigated. Thermo-gravimetric-analysis showed that the combustion of gel-complexes occurred in the temperature range from 178 to 247 C. Among the samples pre-heated at 150 C, the sample pre-heated for 4 h had the highest surface area (11.12 m2 g-1; particle size ∼ 30 nm). TEM analysis revealed that the citric-gel synthesized GeO2 was encapsulated with carbon. This carbon encapsulation acted as a critical buffer layer against capacity degradation in the fabricated electrodes. The optimized sample showed a specific capacity of 738 mA h g-1 and maintained its reversibility after 50 cycles at a capacity of 697 mA h g-1. The electrode containing the optimized sample showed a reversible capacity of 530 mA h g-1 at 1 C rate

Original languageEnglish
Pages (from-to)203-209
Number of pages7
JournalElectrochimica Acta
Volume116
DOIs
StatePublished - 10 Jan 2014
Externally publishedYes

Keywords

  • Citric-gel method
  • Core-shell
  • Cyclability
  • Germanium dioxide
  • Lithium-ion batteries

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