|
|||||
|
|
Ultrathin Anatase TiO2 Nanosheets Embedded with TiO2‐B Nanodomains for Lithium‐Ion Storage: Capacity Enhancement by Phase Boundaries |
|
| Authors: | Qili Wu Jungu Xu Xianfeng Yang Fengqi Lu Shiman He Jingling Yang Hong Jin Fan Mingmei Wu |
| Affiliation: | 1. MOE Key Laboratory of Bioinorganic and Synthetic Chemistry, State Key Laboratory of Optoelectronic Materials and Technology, Key Laboratory of Environment and Energy Chemistry of Guangdong Higher Education Institutes, School of Chemistry and Chemical Engineering, Sun Yat‐Sen (Zhongshan) University, Guangzhou, P. R. China;2. Analytical and Testing Center, South China University of Technology, Guangzhou, P. R. China;3. Division of Physics and Applied Physics, School of Physical and Mathematical Sciences, Nanyang Technological University, Singapore, Singapore |
| Abstract: | A new form of TiO2 microspheres comprised of anatase/TiO2‐B ultrathin composite nanosheets has been synthesized successfully and used as Li‐ion storage electrode material. By comparison between samples obtained with different annealing temperatures, it is demonstrated that the anatase/TiO2‐B coherent interfaces may contribute additional lithium storage venues due to a favorable charge separation at the boundary between the two phases. The as‐prepared hierarchical nanostructures show capacities of 180 and 110 mAh g?1 after 1000 cycles at current densities of 3400 and 8500 mA g?1. The ultrathin nanosheet structure which provides short lithium diffusion length and high electrode/electrolyte contact area also accounts for the high capacity and long‐cycle stability. |
| Keywords: | anatase interfacial storage lithium ion battery TiO2‐B ultrathin nanosheet |