TY  - JOUR
AU  - Liu, Yongchang
AU  - Wang, Fanfan
AU  - Fan, Li-Zhen
PY  - 2018
TI  - Self-standing Na-storage anode of Fe2O3 nanodots encapsulated in porous N-doped carbon nanofibers with ultra-high cyclic stability
JO  - Nano Research
SN  - 1998-0124
SP  - 4026
EP  - 4037
VL  - 11
IS  - 8
AB  - Ultrasmall γ-Fe2O3 nanodots (~ 3.4 nm) were homogeneously encapsulated in interlinked porous N-doped carbon nanofibers (labeled as Fe2O3@C) at a considerable loading (~ 51 wt.%) via an electrospinning technique. Moreover, the size and content of Fe2O3 could be controlled by adjusting the synthesis conditions. The obtained Fe2O3@C that functioned as a self-standing membrane was used directly as a binder- and current collector-free anode for sodium-ion batteries, displaying fascinating electrochemical performance in terms of the exceptional rate capability (529 mA·h·g-1 at 100 mA·g-1 compared with 215 mA·h·g-1 at 10, 000 mA·g-1) and unprecedented cyclic stability (98.3% capacity retention over 1, 000 cycles). Furthermore, the Na-ion full cell constructed with the Fe2O3@C anode and a P2-Na2/3Ni1/3Mn2/3O2 cathode also exhibited notable durability with 97.2% capacity retention after 300 cycles. This outstanding performance is attributed to the distinctive three-dimensional network structure of the very-fine Fe2O3 nanoparticles uniformly embedded in the interconnected porous N-doped carbon nanofibers that effectively facilitated electronic/ionic transport and prevented active materials pulverization/aggregation caused by volume change upon prolonged cycling. The simple and scalable preparation route, as well as the excellent electrochemical performance, endows the Fe2O3@C nanofibers with great prospects as high-rate and long-life Na-storage anode materials.
UR  - https://doi.org/10.1007/s12274-018-1985-0
DO  - 10.1007/s12274-018-1985-0