Highly Reversible Lithium Storage in Hierarchical Ca2Ge7O16 Nanowire Arrays/Carbon Textile Anodes

Aligned Ca2Ge7O16 nanowire arrays were successfully grown on carbon textiles to form hierarchical 3D structures by using a facile hydrothermal method on a large scale. Typical Ca2Ge7O16 nanowires are single crystals that show preferred growth along the [001] direction. The 3D hierarchical structures were used as binder‐free anodes for lithium‐ion batteries, which showed the features of highly reversible capacity (900–1100 mA h g−1 at a current density of 300 mA g−1), remarkable cycling stability, even over 100 cycles, and good rate capability, with a capacity of about 500 mA h g−1 at 3 A g−1. Furthermore, highly bendable full cells were also fabricated, which showed high flexibility, with little voltage change after bending 600 times, and superior temperature tolerance within the range 4–60 °C, thus demonstrating their promising potential for applications in high‐performance lithium‐ion batteries. Batteries not included: A hierarchical flexible electrode that consisted of aligned Ca2Ge7O16 nanowire arrays on carbon textile (see figure) exhibited a highly reversible capacity, remarkable cycling stability, and good rate capability.