School of Physical Science and Technology, Key Laboratory for Magnetism and Magnetic Materials of the Ministry of Education, Lanzhou University , Lanzhou 730000, China.
ACS Nano. 2015 Feb 24;9(2):1858-67. doi: 10.1021/nn506760p. Epub 2015 Jan 30.
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.
锗是一种很有前途的锂离子电池阳极材料，因为它具有大的理论比容量、良好的导电性和快速的锂离子扩散率。在这项工作中，设计了一种在泡沫镍上制备的 Co3O4 纳米线阵列作为锗阳极的纳米结构集流器。通过将电压截止窗口限制在适当的范围内，所得的锗阳极在半电池和全电池中表现出优异的锂存储性能，这主要归因于设计的纳米结构集流器具有良好的导电性、足够的缓冲空间以适应体积变化，以及缩短了离子传输长度。更重要的是，组装的 Ge/LiCoO2 全电池具有 475 Wh/kg 的高能量密度和 6587 W/kg 的高功率密度。在 5000 mA g(-1)的电流密度下，Ge 阳极的容量在 150 次循环后仍保持在 1184 mA h g(-1)的高值。
