| Affiliation: | 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. |
