Encapsulation of a Core–Shell Porous Fe3O4@Carbon Material with Reduced Graphene Oxide for Li+Battery Anodes with Long Cyclability
- Resource Type
- Article
- Authors
- Wu, Qichao; Yu, Rui; Zhou, Zihan; Liu, Huaiwen; Jiang, Rongli
- Source
- Langmuir; 20210101, Issue: Preprints
- Subject
- Language
- ISSN
- 07437463; 15205827
Anode materials are critical for energy devices based on Li-ion batteries (LIBs). This work reports on a facile method to produce anodes based on carbon-coated Fe3O4(CP-Fe3O4) that is encapsulated in reduced graphene oxide (rGO) layers forming a porous core–shell structure Fe3O4@carbon (rGO–CP-Fe3O4). First, Fe3O4particles were coated with carbon by hydrothermal and carbothermal reduction methods leading to an intermediate product termed CP-Fe3O4. Next, CP-Fe3O4was encapsulated by two-dimensional layered rGO to obtain CP-Fe3O4composites with a three-dimensional structure. The Fe3O4volume expansion during LIB cycling was inhibited by carbon and rGO and a three-dimensional electron transport network was generated by the introduction of rGO. The rGO–CP-Fe3O4composite showed excellent electrochemical properties (839 mA h g–1at 0.3 A g–1after 200 cycles) and rate capacities (165 mA h g–1at 6.0 A g–1). In addition, the rGO–CP-Fe3O4pseudocapacitance was equal to 65% of the overall capacity at 5 mV s–1.