Journal article · Ahead of Print article
Microwave assisted crystalline and morphology evolution of flower-like Fe2O3@ iron doped K-birnessite composite and its application for lithium ion storage
Department of Chemistry, Technical University of Denmark1
Shandong University2
National Centre for Nano Fabrication and Characterization, Technical University of Denmark3
Nanocharacterization, National Centre for Nano Fabrication and Characterization, Technical University of Denmark4
Molecular Windows, Nanocharacterization, National Centre for Nano Fabrication and Characterization, Technical University of Denmark5
Manganese oxides (MnOx) and derivations are considered as one of the most attractive anode materials for lithium-ion batteries (LIBs) due to their earth-abundant, cost-effective and low-toxic specialties. Herein, we report a flower-like composite consisting of internal Fe2O3 nanocrystals and outer hierarchal iron doped K-birnessite type MnOx layers (Fe2O3@Fe doped K-birnessite), which is synthesized by a facile one-pot microwave-assisted heating synthesis (MAHS).
The crystalline and morphology evolution of Fe2O3@Fe doped K-birnessite composite are studied by checking the products at various reaction durations, using X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS) and scanning & transmission electron microscopy (SEM & TEM). Key factors affecting the morphology such as reactive temperature and stoichiometric ratio are systematically investigated.
When tested for LIBs, the optimized hybrid Fe2O3@Fe doped K-birnessite composite exhibits a high reversible capacity of 758 mA h g−1 at 500 mA g−1 after 200 cycles, outperforming the pure K-birnessite (203 mA h g−1). The excellent electrochemical performance is assigned to the efficient utilization of the merits of the flower-like structure and strong interaction between MnOx and Fe2O3.
Further, crucial factors associated with structural stability of Fe2O3@Fe doped K-birnessite composite during cycling are identified.
Language: | English |
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Year: | 2020 |
Pages: | 146513 |
ISSN: | 18735584 and 01694332 |
Types: | Journal article and Ahead of Print article |
DOI: | 10.1016/j.apsusc.2020.146513 |
ORCIDs: | Xiao, Xinxin , Tang, Jing , Mølhave, Kristian and Zhang, Jingdong |