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2015 ; 5
(ä): 11326
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Unique Urchin-like Ca2Ge7O16 Hierarchical Hollow Microspheres as Anode Material
for the Lithium Ion Battery
#MMPMID26061390
Li D
; Feng C
; Liu HK
; Guo Z
Sci Rep
2015[Jun]; 5
(ä): 11326
PMID26061390
show ga
Germanium is an outstanding anode material in terms of electrochemical
performance, especially rate capability, but its developments are hindered by its
high price because it is rare in the crust of earth, and its huge volume
variation during the lithium insertion and extraction. Introducing other cheaper
elements into the germanium-based material is an efficient way to dilute the high
price, but normally sacrifice its electrochemical performance. By the combination
of nanostructure design and cheap element (calcium) introduction, urchin-like
Ca2Ge7O16 hierarchical hollow microspheres have been successfully developed in
order to reduce the price and maintain the good electrochemical properties of
germanium-based material. The electrochemical test results in different
electrolytes show that ethylene carbonate/dimethyl carbonate/diethyl carbonate
(3/4/3 by volume) with 5 wt% fluoroethylene carbonate additive is the most
suitable solvent for the electrolyte. From the electrochemical evaluation, the
as-synthesized Ca2Ge7O16 hollow microspheres exhibit high reversible specific
capacity of up to 804.6 mA h g(-1) at a current density of 100 mA g(-1) after 100
cycles and remarkable rate capability of 341.3 mA h g(-1) at a current density of
4 A g(-1). The growth mechanism is proposed based on our experimental results on
the growth process.