Journal
NANOSCALE
Volume 10, Issue 15, Pages 6872-6877Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/c8nr00153g
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Funding
- National Science Foundation of China [51502009, 21675109]
- Science Foundation of Henan province [162300410209]
- key scientific research project of high schools in Henan Province [17A480009]
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As a promising alloy-type anode material for rechargeable batteries, the metal germanium (Ge) shows high capacity, but it suffers from a fast capacity fading problem caused by a large volume expansion during lithiation/delithiation cycles. In this study, via a facile electrospinning method, we optimized the combination structure of Ge quantum dots (QDs) and carbon nanofibers (CNFs). Specifically, Ge QDs with a diameter of 4-7 nm were highly dispersed in porous (pore size 10-150 nm) CNFs. The hybridized Ge/CNF nanocomposite exhibited remarkable Li storage performances such as high reversible capacity (1204 mA h g(-1) at a current density of 200 mA g(-1)), high capacity retention (87.1% after 100 cycles) and excellent rate property (760 mA h g(-1) at 3000 mA g(-1)). The improved electrochemical performance was due to the synergistic effects of Ge QDs and carbon nanofibers; this effectively alleviated the volume expansion problem, prevented the agglomeration of Ge, maintained the structural stability of the nanocomposite, and improved the electrode kinetics of diffusion of Li ions.
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