Binder-free Fe2N nanoparticles on carbon textile with high power density as novel anode for high-performance flexible lithium ion batteries

Abstract For the fabrication of flexible full lithium ion batteries (FLIBs), suitable anode material is highly demanded. Iron nitrides hold great promise as anode material for lithium ion batteries (LIBs) due to their large specific capacity and high electrical conductivity. However, their poor electrochemical stability severely limits their application as electrode material for LIBs. In this article, we synthesize binder-free Fe 2 N nanoparticles (Fe 2 N NPs) as high performance free-standing anode for LIBs. When tested in a half-cell, the binder-free Fe 2 N NPs delivered a high reversible capacity of 900 mAh/g. At high current density of 6000 mA/g, the binder-free Fe 2 N NPs exhibits excellent cyclic stability with 76% capacity retention after 300 cycles. We also demonstrated high power and energy density FLIB based on Fe 2 N NPs anode and LiCoO 2 cathode for the first time. The Fe 2 N//LiCoO 2 FLIB device shows attractive electrochemical performance and high flexibility. More importantly, Fe 2 N//LiCoO 2 FLIB device achieved a high power density of 3200 W/kg and a high energy density of 688 Wh/kg. These values are substantially enhanced compared to most of the reported LIB devices. This work constitutes the first demonstration of using Fe 2 N NPs as high performance anode, which could potentially improve the performance of energy storage devices.

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