Filter Paper-Derived Three-Dimensional Carbon Fibers Film Supported Fe 3 O 4 as a Superior Binder-Free Anode Material for High Performance Lithium-Ion Batteries

Highly uniform and tight adhering of Fe 3 O 4 particles on carbon fiber film (Fe 3 O 4 /CFF) is achieved through a simple in-situ thermal oxidation method. Particularly, 3D CFF with interconnected structure can shorten transfer path and buffer the volume expansion during charge-discharge cycling. Herein, the obtained Fe 3 O 4 /CFF anode exhibits a stable cycling performance and excellent high rate capability. The cell delivers a reversible capacity of 1 711 mAh·g –1 at a current density of 100 mA·g –1 after 100 cycles. Even at a high rate density of 2 A·g –1 , the specific capacity also can maintain 1 034 mAh·g –1 after 100 cycles. The simplified fabrication is featured with low-cost and this binder-free perspective holds great potential in mass-production of high-performance metal oxide electrochemical devices.