Journal
ELECTROCHEMISTRY COMMUNICATIONS
Volume 12, Issue 6, Pages 847-850Publisher
ELSEVIER SCIENCE INC
DOI: 10.1016/j.elecom.2010.04.003
Keywords
Hollow microspheres; Lithium ion battery; Phase transitions; Hierarchical; ZnFe2O4
Categories
Funding
- National 973 Program [2009CB220100]
- National Science Foundation of China (NSFC) [50472072, 20974120]
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Hollow microspheres composed of phase-pure ZnFe2O4 nanoparticles (hierarchically structured) have been prepared by hydrothermal reaction. The unique hollow spherical structure significantly increases the specific capacity and improves capacity retention of this material. The product of each phase transition during initial discharge (2nFe(2)O(4) <-> Li0.5ZnFe2O4 <-> Li2ZnFe2O4 -> Li2O + Li-Zn + Fe) and their structural reversibility are recognized by X-ray diffraction and electrochemical characterization. The products of the deeply discharged (Li-Zn alloy and Fe) and recharged materials (Fe2O3) were clarified based on high resolution transmission electron microscopic technique and first-principle calculations. (C) 2010 Elsevier B.V. All rights reserved.
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