Storage of Lithium in Hydrothermally Synthesized GeO2 Nanoparticles

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• 作者：Yong-Mao Lin ; Kyle C. Klavetter ; Adam Heller ; C. Buddie Mullins
• 刊名：The Journal of Physical Chemistry Letters
• 出版年：2013
• 出版时间：March 21, 2013
• 年：2013
• 卷：4
• 期：6
• 页码：999-1004
• 全文大小：357K
• 年卷期：v.4,no.6(March 21, 2013)
• ISSN：1948-7185

文摘

Amorphous GeO₂ nanoparticles were prepared via a surfactant-assisted hydrothermal process. The effect of the reaction temperature and the surfactant concentration on the morphology of GeO₂ particles were investigated. Particles of less than 300 nm were obtained when using 1,2-diaminopropane surfactant in a synthesis carried out at 180鈼?/sup>C. The synthesized germanium oxide nanoparticles were evaluated for their utility as the active anode material in Li-ion batteries. The electrode prepared with this material exhibited a stable capacity 600 mAh g^鈥? at 0.2 C rate for up to 150 cycles in a conventional electrolyte containing ethylene carbonate (EC). The cyclability of the GeO₂ nanoparticle electrode was further improved by using a fluorinated ethylene carbonate (FEC) based electrolyte, which showed capacities greater than 600 mAh g^鈥? and retained more than 96% of their capacity after 500 cycles at 0.2 C rate. The effect of different electrolyte systems was studied by using electrochemical impedance spectroscopy and electron microscopy.

Keywords:

germanium dioxide; nanoparticles; lithium ion battery; anode; fluoroethylene carbonate