Yolk bishell MnxCo1- xFe2O4 hollow microspheres and their embedded form in carbon for highly reversible lithium storage

Zailei Zhang*, Yongjun Ji, Jing Li, Qiangqiang Tan, Ziyi Zhong, Fabing Su

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

53 Scopus citations

Abstract

The yolk-shell hollow structure of transition metal oxides has many applications in lithium-ion batteries and catalysis. However, it is still a big challenge to fabricate uniform hollow microspheres with the yolk bishell structure for mixed transition metal oxides and their supported or embedded forms in carbon microspheres with superior lithium storage properties. Here we report a new approach to the synthesis of manganese cobalt iron oxides/carbon (MnxCo1-xFe2O4 (0 ≤ x ≤ 1)) microspheres through carbonization of Mn2+Co2+Fe3+/carbonaceous microspheres in N2, which can be directly applied as high-performance anodes with a long cycle life for lithium storage. Furthermore, uniform hollow microspheres with a MnxCo1-xFe2O4 yolk bishell structure are obtained by annealing the above MnxCo1-xFe2O4/carbon microspheres in air. As demonstrated, these anodes exhibited a high reversible capacity of 498.3 mAh g-1 even after 500 cycles for Mn0.5Co0.5Fe2O4/carbon microspheres and 774.6 mAh g-1 over 100 cycles for Mn0.5Co0.5Fe2O4 yolk bishell hollow microspheres at the current density of 200 mA g-1. The present strategy not only develops a high-performance anode material with long cycle life for lithium-ion batteries but also demonstrates a novel and feasible technique for designed synthesis of transition metal oxides yolk bishell hollow microspheres with various applications.

Original languageEnglish
Pages (from-to)6300-6309
Number of pages10
JournalACS applied materials & interfaces
Volume7
Issue number11
DOIs
StatePublished - 25 Mar 2015
Externally publishedYes

Keywords

  • anode
  • hollow microspheres
  • lithium-ion batteries
  • manganese cobalt iron oxides
  • yolk bishell

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