Microwave assisted crystalline and morphology evolution of flower-like Fe2O3@ iron doped K-birnessite composite and its application for lithium ion storage

Wei Huang, Xiaowen Zheng, Huihui Shangguan, Xinxin Xiao, Jing Tang, Hongyu Sun, Kristian Mølhave, Lijie Ci, Pengchao Si, Jingdong Zhang*

*Corresponding author for this work

Research output: Contribution to journalJournal articleResearchpeer-review

Abstract

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.
Original languageEnglish
Article number146513
JournalApplied Surface Science
Volume525
Number of pages10
ISSN0169-4332
DOIs
Publication statusPublished - 2020

Keywords

  • Lithium ion storage
  • Morphology evolution
  • Crystalline evolution
  • Iron doped K-birnessite
  • Fe2O3

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