Facile synthesis and electrochemical performance of ordered LiNi0.5Mn1.5O4 nanorods as a high power positive electrode for rechargeable Li-ion batteries |
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Authors: | Hyun-Wook LeeP. Muralidharan Claudio M. MariRiccardo Ruffo Do Kyung Kim |
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Affiliation: | a Department of Materials Science and Engineering, KAIST, Daejeon 305-701, Republic of Korea b Dipartimento di Scienza dei Materiali, Università degli Studi di Milano-Bicocca, Milan 20125, Italy |
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Abstract: | One-dimensional ordered LiNi0.5Mn1.5O4 nanorods have been fabricated and investigated for use as a high power cathode in rechargeable Li-ion batteries. These highly crystalline nanorods, with an ordered spinel structure and diameters and lengths around 130 nm and 1.2 μm, respectively, were synthesized in two steps by using a hydrothermal reaction to produce β-MnO2 nanorods followed by solid-state lithiation. Electrochemical analysis showed the superior performance of nanorods as a cathode in Li-ion half cells. The specific charge and discharge capacities were found to be 120 and 116 mAh g−1 at a 0.5 C rate, and 114 and 111 mAh g−1 at a 1 C rate between 3.5 and 5.0 V vs. Li+/Li. Moreover, the nanorods exhibit high power capability, maintaining capacities of 103 and 95 mAh g−1 at specific currents of 732.5 and 1465 mA g−1 (5 and 10 C rates), respectively. |
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Keywords: | Lithium ion battery High voltage cathode Lithium nickel manganese oxide Nanorod High rate capability |
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