Abstract
To solve the volume expansion and poor electrical conductivity of germanium-based anode materi-als,Ge/rGO/CNTs nanocomposites with three-dimensional network structure are fabricated through the dispersion of polyethylene-polypropylene glycol(F127)and reduction of hydrogen.An interesting phe-nomenon is discovered that F127 can break GeO2 polycrystalline microparticles into 100 nm nanopar-ticles by only physical interaction,which promotes the uniform dispersion of GeO2 in a carbon net-work structure composed of graphene(rGO)and carbon nanotubes(CNTs).As evaluated as anode mate-rial of Lithium-ion batteries,Ge/rGO/CNTs nanocomposites exhibit excellent lithium storage performance.The initial specific capacity is high to 1549.7 mAh/g at 0.2 A/g,and the reversible capacity still retains 972.4 mAh/g after 100 cycles.The improved lithium storage performance is attributed to that Ge nanopar-ticles can effectively slow down the volume expansion during charge and discharge processes,and three-dimensional carbon networks can improve electrical conductivity and accelerate lithium-ion transfer of anode materials.
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