Nonsolvent‐induced phase separation‐derived TiO ₂ nanotube arrays/porous Ti electrode as high‐energy‐density anode for lithium‐ion batteries

Abstract

Abstract TiO 2 nanotube arrays, growing on three‐dimensional (3D) porous Ti membrane, were synthesized using a facile nonsolvent‐induced phase separation and anodization process. The length of those three‐dimensional nanotube arrays could be tuned by prolonging the anodizing time. When the anodizing time is 8 h, the three‐dimensional TiO 2 nanotube arrays/porous Ti electrode exhibits well cycling stability and ultra‐high specific capacity, which is used in lithium‐ion batteries, attributed to the high utilization rate of the substrate and the high growth intensity of the active materials. Three‐dimensional TiO 2 nanotube arrays/porous Ti electrode, at 100 μA·cm −2 with 8 h anodizing time, shows a typical discharge plateau at 1.78 V and exhibits the specific capacity with 2126.7 μAh·cm −2 . The novel nanotube arrays@3D porous architecture effectively shortens the electron/ion transmission path, which could pave way for optimizing the design of high‐performance anode materials for next‐generation energy storage system.