High-rate and stable IRON PHOSPHIDE (cas 12023-53-9) nanorods anode for sodium-ion battery

Add time:07/28/2019    Source:sciencedirect.com

This study reports IRON PHOSPHIDE (cas 12023-53-9) (FeP) nanorod arrays on Ti substrates (FeP NRs/Ti) as anode for full sodium-ion batteries. The FeP nanorod arrays electrodes exhibit a high-rate capability of 414.7 mAh g−1 at 100 mA g−1 in the semi-battery tests (sodium foil as the counterpart) and 196.2 mAh g−1 at 2000 mA g−1. The high reversible capacity can be ascribed to an augmented sodium-ion diffusion coefficient (∼10−12 cm2 s−1) originated from the nanorod arrays. Besides, the binder-free and highly oriented- 1D FeP electrode helped to alleviate the volume change during (dis)charging processes thereby ensuring a long cycling life (207.7 mAh g−1 over 1000 cycles at 500 mA g−1). Electrochemical and ex-situ studies confirmed the significant contribution of pseudocapacitance to the highly electrochemical performance of FeP nanorod arrays. Most importantly, the sodium-ion full battery based on FeP NRs/Ti as anode and Na3V2(PO4)3 as cathode materials showed stable cycling performance over 200 cycles at a current rate of 1 C (1 C = 100 mA g−1, voltage range of 2.0–3.6 V), simultaneously possessing a high energy density of 185 Wh kg−1 at the power density of 200 W kg−1. We further successfully demonstrated an energy pack by combining four CH3NH3PbI3-xClx-based perovskite solar cells in series and a Na3V2(PO4)3-FeP NRs/Ti full sodium-ion battery, achieving a photoelectric conversion and storage efficiency of 5.2% under 1 sun light illumination.

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