Add time:08/10/2019 Source:sciencedirect.com
Germanium (Ge) is a promising anode material for lithium-ion batteries (LIBs) due to its large theoretical specific capacity (1600 mA h g−1), high Li diffusivity and large intrinsic electrical conductivity. Despite these merits, its large volumetric change during lithiation/delithiation process and relatively high production cost make it difficult to use in commercial batteries. In this paper, we report a facile, easy to scale up, and environmentally friendly method to prepare an amorphous phase GeOx (x < 1) hollow composite at a hydrothermal condition using an aqueous precursor solution containing GeO2 particles, and citric acid. The citric acid induces gas bubble templates and frameworks to improve the structural strain for Li+ ion conduction during cycling. The resulting GeOx-C hallow composite anode shows enhanced cyclability with a reversible capacity of 930 mA h g−1 after 100 cycles at a current density of 0.3 C.
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