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Amorphous mesoporous GeO anode for Na-ion batteries with high capacity and long lifespan.

R Soc Open Sci; 5(1): 171477, 2018 Jan.
Artigo em Inglês | MEDLINE | ID: mdl-29410850
It is recently demonstrated that amorphous Ge anode shows higher reversible Na-ion storage capacity (590 mA h g ) than crystallized Ge anode (369 mA h g ). Here, amorphous GeO anode is prepared by a simple wet-chemistry reduction route at room temperature. The obtained amorphous GeO shows a porous hierarchical architecture, accompanied with a Brunauer-Emmett-Teller surface area of 159 m g and an average pore diameter of 14 nm. This unique structure enables the GeO anode to enhance the Na-ion/electron diffusion rate, and buffer the volume change. As anode for Na-ion battery, high reversible capacity over 400 mA h g , fine rate capability with a capacity of 200 mA h g maintained at 3.0 A g and long-term cycling stability with 270 mA h g even over 1000 cycles at 1.0 A g are obtained.