Preparation of manganese oxide with high density by decomposition of MnCO3 and its application to synthesis of LiMn2O4 |
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Authors: | Hua-jun Guo Xin-hai LiZhi-xing Wang Wen-jie PengXuan Cao Hui-feng Li |
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Affiliation: | School of Metallurgical Science and Engineering, Central South University, Changsha 410083, China |
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Abstract: | Manganese oxide with high tap density was prepared by decomposition of spherical manganese carbonate, and then LiMn2O4 cathode materials were synthesized by solid-state reaction between the manganese oxide and lithium carbonate. Structure and properties of the samples were determined by X-ray diffraction, Brunauer–Emmer–Teller surface area analysis, scanning electron microscope and electrochemical measurements. With increase of the decomposition temperature from 350 °C to 900 °C, the tap density of the manganese oxide rises from 0.91 g cm−3 to 2.06 g cm−3. Compared with the LiMn2O4 cathode made from chemical manganese dioxide or electrolytic manganese dioxide, the LiMn2O4 made from manganese oxide of this work has a larger tap density (2.53 g cm−3), and better electrochemical performances with an initial discharge capacity of 117 mAh g−1, a capacity retention of 93.5% at the 15th cycle and an irreversible capacity loss of 2.24% after storage at room temperature for 28 days. |
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Keywords: | Lithium ion batteries Cathode Manganese oxide LiMn2O4 Decompose |
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