| 摘要： |
The 18-C triangular ring structure of graphdiyne (GDY) can form three-dimensional channel between layers and make GDY an excellent anode material for lithium ion batteries (LIBs). The stable solid electrolyte interface (SEI) film and strong C-F bond formed by fluoride can forcefully enhance the cycle stability in LIBs. Additionally, the stable synthesis of hydrogen-containing carbon material reduces cost and the effective lithium storage of H increases specific capacity. Herein, we propose a strategy of H and F positioning balanced co-doped GDY, combining the lithium storage contributions of H and F elements and achieving an extraordinarily high capacity of 2050 mA h g(-1) at 50 mA g(-1) and only 23% reduction after even 8000 cycles. The fibrous network porous structure can be formed and generate excellent electrolyte infiltration and interface stability with SEI film when H and F is evenly co-doped. This work provides approach to interface structure adjustment that effectively improved lithium storage stability. Besides, the combination approach of positioning substitution and co-doping contributes to high lithium storage capacity and provides reference for elements co-doping. |
