Journal
JOURNAL OF POWER SOURCES
Volume 269, Issue -, Pages 755-759Publisher
ELSEVIER
DOI: 10.1016/j.jpowsour.2014.07.042
Keywords
Li-ion battery; Anode; Germanium; GeO2; Mesoporous carbon; Nanoconfinement
Funding
- RS2E (Reseau sur le Stockage Electrochimique de l'Energie) network through the ANR project Storex [ANR-10-LABX-76-01]
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A novel nano-GeO2/mesoporous carbon (GeO2/MC) composite material was prepared by in-situ decomposition of germanium ethoxide (Ge(OC2H5)(4)) infiltrated in a mesoporous carbon (MC) obtained by soft-templating procedure. With GeO2 (<20 nm) homogeneously distributed in the carbon network, the GeO2/MC composite retains 93% of its initial charge capacity after 380 cycles at constant 1 C rate (1500 mA g(-1)) as electrode material vs. Li and shows high rate capability at variable current rates. A restructuration of the germanium phase into smaller particles during the first cycles is also evidenced. The composite presents a set of advantages such as low GeO2 content, convenient preparation approach and high coulombic efficiency (>99%). (C) 2014 Elsevier B.V. All rights reserved.
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