Journal
ACS APPLIED MATERIALS & INTERFACES
Volume 10, Issue 13, Pages 10974-10985Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsami.8b01358
Keywords
MnO-doped Fe3O4; nanosphere; hierarchical structure; carbon coating; anode; lithium-ion batteries
Funding
- Science and Technology Plan Project of Zhejiang Province [2017C31078]
- Zhejiang Provincial Natural Science Foundation of China [LY17B030004]
- National Natural Science Foundation of China [21373182]
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Hierarchically nanostructured binary/multiple transition-metal oxides with electrically conductive coatings are very attractive for lithium-ion batteries owing to their excellent electrochemical properties induced by their unique compositions and microstructures. Herein, hierarchical MnO-doped Fe3O4@C composite nanospheres are prepared by a simple one-step annealing in Ar atmosphere, using Mn-doped Fe-based metal-organic frameworks (Mn-doped MIL-53(Fe)) as precursor. The MnO-doped Fe3O4@C composite particles have a uniform nanosphere structure with a diameter of similar to 100 nm, and each nanosphere is composed of clustered primary nanoparticles with an amorphous carbon shell, forming a unique hierarchical nanoarchitecture. The as-prepared hierarchical MnO-doped Fe3O4@C composite nanospheres exhibit markedly enhanced lithium-storage performance, with a large capacity of 1297.5 mAh g(-1) after 200 cycles at 200 mA g(-1). The cycling performance is clarified through analyzing the galvanostatic discharge/charge voltage profiles and electrochemical impedance spectra at different cycles. The unique microstructures and Mn element doping of the hierarchical MnO-doped Fe3O4@C composite nanospheres lead to their enhanced lithium-storage performance.
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