title: Germanium anode with excellent lithium storage performance in a germanium/lithium-cobalt oxide lithium-ion battery.
abstract: Germanium is a highly promising anode material for lithium-ion batteries as a consequence of its large theoretical specific capacity, good electrical conductivity, and fast lithium ion diffusivity. In this work, Co3O4 nanowire array fabricated on nickel foam was designed as a nanostructured current collector for Ge anode. By limiting the voltage cutoff window in an appropriate range, the obtained Ge anode exhibits excellent lithium storage performance in half- and full-cells, which can be mainly attributed to the designed nanostructured current collector with good conductivity, enough buffering space for the volume change, and shortened ionic transport length. More importantly, the assembled Ge/LiCoO2 full-cell shows a high energy density of 475 Wh/kg and a high power density of 6587 W/kg. A high capacity of 1184 mA h g(-1) for Ge anode was maintained at a current density of 5000 mA g(-1) after 150 cycles.
authors: School of Physical Science and Technology, Key Laboratory for Magnetism and Magnetic Materials of the Ministry of Education, Lanzhou University , Lanzhou 730000, China.
authors: Xiuwan
authors: X
authors: Li
authors: Zhibo
authors: Z
authors: Yang
authors: Yujun
authors: Y
authors: Fu
authors: Li
authors: L
authors: Qiao
authors: Dan
authors: D
authors: Li
authors: Hongwei
authors: H
authors: Yue
authors: Deyan
authors: D
authors: He
keywords: Co3O4 nanowires; anode material; full-cell; germanium coating; nanostructured current collector