Ultrasonic spray pyrolysis of nano crystalline spinel LiMn2O4 showing good cycling performance in the 3 V range |
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Authors: | Sang-Ho Park Sung-Woo Oh Yang-Kook Sun |
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Affiliation: | a Department of Chemical Engineering, Center for Information and Communication Materials, Hanyang University, Seoul 133-791, South Korea b VK Corporation, Pyongtaek-City, Kyonggi-Do 450-090, South Korea c Division of Material Science and Engineering, Hanyang University, Seoul 133-791, South Korea |
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Abstract: | Spherical lithium manganese oxide spinel was synthesized by an ultrasonic spray pyrolysis method, and has been characterized using X-ray diffraction, scanning electron microscopy, transimission electron microscopy and electrochemical cycling at 3 V regions. The LiMn2O4 powders were composed of about 10 nm-sized primary particles. The delivered discharge capacity of the synthesized nano-material was 125 mAh g−1 between 2.4 and 3.5 V and its retention was about 96% upon 50 cycling. From the high resolution transmission electron microscopic study, it was found that structural transition of the parent material did not occur even after the 50th electrochemical cycling on the 3 V region. It seems that the reversible structural change is possible for nanocrystalline LiMn2O4 as observed by the X-ray diffraction and transition electron microscopic observations. |
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Keywords: | Spinel LiMn2O4 Nanocrystalline Positive electrode 3 V Cyclability Lithium-ion battery |
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