Journal
JOURNAL OF ALLOYS AND COMPOUNDS
Volume 506, Issue 2, Pages 883-887Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.jallcom.2010.07.104
Keywords
Spray pyrolysis; Lithium ion battery; Powders; Rechargeable properties; Surfactant
Categories
Funding
- New Energy and Industrial Technology Development Organization
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Li-rich lithium manganese oxide (Li1.09Mn1.91O4) powders were prepared by spray pyrolysis using an aqueous solution of manganese carbonate. The aqueous solution, in which manganese carbonate was uniformly dispersed by a surfactant, was used as the starting solution. As observed by scanning electron microscopy, Li1.09Mn1.91O4 had spherical morphology with a porous microstructure and consisted of primary particles. Powder X-ray diffraction analysis revealed that the crystal phase of the Li1.09Mn1.91O4 powders was in good agreement with the spinel phase. Inductively coupled plasma analysis showed that the molar ratio of Li and Mn in the Li1.09Mn1.91O4 powders was 1.09:1.90. Through electrochemical measurements, the initial discharge capacity of a Li1.09Mn1.91O4 cathode was found to be 107 mAh/g at 1 C (99% retention after 100 cycles) and 91 mAh/g at 10 C (93% retention after 100 cycles). The retention ratio of discharge capacity remained greater than 90%, although capacity loss was observed up to 20 cycles. The Li1.09Mn1.91O4 cathode derived from carbonate solution had excellent cycling stability in comparison with the LiMn2O4 cathode derived from nitrate solution. (C) 2010 Elsevier B.V. All rights reserved.
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