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- Title
Micro/Nanoengineered α‐Fe<sub>2</sub>O<sub>3</sub> Nanoaggregate Conformably Enclosed by Ultrathin N‐Doped Carbon Shell for Ultrastable Lithium Storage and Insight into Phase Evolution Mechanism.
- Authors
Xie, Dan; Li, Huan‐Huan; Shi, Yan‐Hong; Diao, Wan‐Yue; Jiang, Ru; Sun, Hai‐Zhu; Wu, Xing‐Long; Li, Wenliang; Fan, Chao‐Ying; Zhang, Jing‐Ping
- Abstract
The Fe‐based transition metal oxides are promising anode candidates for lithium storage considering their high specific capacity, low cost, and environmental compatibility. However, the poor electron/ion conductivity and significant volume stress limit their cycle and rate performances. Furthermore, the phenomena of capacity rise and sudden decay for α‐Fe2O3 have appeared in most reports. Here, a uniform micro/nano α‐Fe2O3 nanoaggregate conformably enclosed in an ultrathin N‐doped carbon network (denoted as M/N‐α‐Fe2O3@NC) is designed. The M/N porous balls combine the merits of secondary nanoparticles to shorten the Li+ transportation pathways as well as alleviating volume expansion, and primary microballs to stabilize the electrode/electrolyte interface. Furthermore, the ultrathin carbon shell favors fast electron transfer and protects the electrode from electrolyte corrosion. Therefore, the M/N‐α‐Fe2O3@NC electrode delivers an excellent reversible capacity of 901 mA h g−1 with capacity retention up to 94.0 % after 200 cycles at 0.2 A g−1. Notably, the capacity rise does not happen during cycling. Moreover, the lithium storage mechanism is elucidated by ex situ XRD and HRTEM experiments. It is verified that the reversible phase transformation of α↔γ occurs during the first cycle, whereas only the α‐Fe2O3 phase is reversibly transformed during subsequent cycles. This study offers a simple and scalable strategy for the practical application of high‐performance Fe2O3 electrodes.
- Subjects
TRANSITION metal oxides; REVERSIBLE phase transitions; LITHIUM cell electrodes; LIMIT cycles; CHARGE exchange; CARBON
- Publication
Chemistry - A European Journal, 2020, Vol 26, Issue 4, p853
- ISSN
0947-6539
- Publication type
Article
- DOI
10.1002/chem.201903893