Premium
3D Hierarchical Porous α‐Fe 2 O 3 Nanosheets for High‐Performance Lithium‐Ion Batteries
Author(s) -
Cao Kangzhe,
Jiao Lifang,
Liu Huiqiao,
Liu Yongchang,
Wang Yijing,
Guo Zaiping,
Yuan Huatang
Publication year - 2015
Publication title -
advanced energy materials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 10.08
H-Index - 220
eISSN - 1614-6840
pISSN - 1614-6832
DOI - 10.1002/aenm.201401421
Subject(s) - materials science , current collector , anode , electrode , electrochemistry , electrical conductor , lithium (medication) , porosity , chemical engineering , ion , nanostructure , nanotechnology , composite material , electrolyte , medicine , chemistry , physics , quantum mechanics , engineering , endocrinology
To develop a long cycle life and good rate capability electrode, 3D hierarchical porous α‐Fe 2 O 3 nanosheets are fabricated on copper foil and directly used as binder‐free anode for lithium‐ion batteries. This electrode exhibits a high reversible capacity and excellent rate capability. A reversible capacity up to 877.7 mAh g −1 is maintained at 2 C (2.01 A g −1 ) after 1000 cycles, and even when the current is increased to 20 C (20.1 A g −1 ), a capacity of 433 mA h g −1 is retained. The unique porous 3D hierarchical nanostructure improves electronic–ionic transport, mitigates the internal mechanical stress induced by the volume variations of the electrode upon cycling, and forms a 3D conductive network during cycling. No addition of any electrochemically inactive conductive agents or polymer binders is required. Therefore, binder‐free electrodes further avoid the uneven distribution of conductive carbon on the current collector due to physical mixing and the addition of an insulator (binder), which has benefits leading to outstanding electrochemical performance.