Fe2TiO5 nanochains as anode for high-performance lithium-ion capacitor

The unique crystal structure and multiple redox couples of iron titanate (Fe 2 TiO 5 ) provide it a high theoretical capacity and good cycling stability when used as an electrode. In this study, the electrospinning method is employed to synthesize one-dimensional (1D) Fe 2 TiO 5 nanochains. The as-prepared Fe 2 TiO 5 nanochains exhibited superior specific capacity (500 mAh·g −1 at 0.10 A·g −1 ), excellent rate performance (180 mAh·g −1 at 5.00 A·g −1 ), and good cycling stability (retaining 100% of the initial specific capacity at a current density of 1.00 A·g −1 after 1000 cycles). The as-assembled Fe 2 TiO 5 /SCCB lithium-ion capacitor (LIC) also delivered a competitive energy density (137.8 Wh·kg −1 ) and power density (11,250 W·kg −1 ). This study proves that the as-fabricated 1D Fe 2 TiO 5 nanochains are promising anode materials for high-performance LICs. Graphic abstract