| Institution: | 1. Institute of Opto-Electronic Materials and Technology, South China Normal University, Guangzhou, 510631 China
Guangdong Provincial Engineering Technology Research Center for, Low Carbon and Advanced Energy Materials, Guangzhou, 510631 China;2. South China Institute of Software Engineering, Guangzhou, 510631 China;3. Guangdong Provincial Engineering Technology Research Center for, Low Carbon and Advanced Energy Materials, Guangzhou, 510631 China;4. Institute of Opto-Electronic Materials and Technology, South China Normal University, Guangzhou, 510631 China |
| Abstract: | Biomimetic straw-like bundles of Co-doped Fe2O3 (SCF), with Co2+ incorporated into the lattice of α-Fe2O3, was fabricated through a cost-effective hydrothermal process and used as the anode material for lithium-ion batteries (LIBs). The SCF exhibited ultrahigh initial discharge specific capacity (1760.7 mA h?1 g?1 at 200 mA g?1) and cycling stability (with the capacity retention of 1268.3 mA h?1 g?1 after 350 cycles at 200 mA g?1). In addition, a superior rate capacity of 376.1 mA h?1 g?1 was obtained at a high current density of 4000 mA g?1. The remarkable electrochemical lithium storage of SCF is attributed to the Co-doping, which increases the unit cell volume and affects the whole structure. It makes the Li+ insertion–extraction process more flexible. Meanwhile, the distinctive straw-like bundle structure can accelerate Li ion diffusion and alleviate the huge volume expansion upon cycling. |
