Improvement of cycling performance of Li1.1Mn1.9O4 at 60 °C by NiO addition for Li-ion secondary batteries |
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Authors: | Seung-Taek Myung Kiyoharu Hosoya Hitoshi Yashiro Naoaki Kumagai |
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Affiliation: | a VK Corporation, 67 Jije-Dong, Pyongtaek-City, Kyonggi-Do 450-090, South Korea b Department of Frontier Materials and Functional Engineering, Graduate School of Engineering, Iwate University, 4-3-5 Ueda, Morioka, Iwate 020-8551, Japan c Department of Applied Chemistry, Tokyo University of Science, 1-3 Kagurazaka, Shinjuku, Tokyo 162-8601, Japan d Department of Chemical Engineering, Hanyang University, Seoul 133-791, South Korea |
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Abstract: | We report on electrochemical properties of NiO-blended spinel Li1.1Mn1.9O4 at elevated temperature (60 °C). Thus, we employed two kinds of NiO powders, those are, larger particle size (>10 μm) and submicron-sized NiO powders obtained by a ball-milling. These NiO powders were blended to the spinel Li1.1Mn1.9O4 as an additive for fabrication of cathode. The resulting discharge capacity for the larger NiO particle-blended Li1.1Mn1.9O4 had similar electrochemical properties to the bare Li1.1Mn1.9O4. On the other hand, submicron-sized NiO-blended Li1.1Mn1.9O4 brought about slightly increased capacity and excellent capacity retention, maintaining its initial capacity of 99.2% at 25 °C and 94% at 60 °C when Li metal was employed as the anode. In Li-ion cell using graphite as the anode, the capacity retention was of about 80% during cycling at 60 °C, whereas C/Li1.1Mn1.9O4 cell retained around 68% of its initial capacity. Such improved properties would be ascribed to the HF scavenging into the electrolyte by presence of the submicron-sized NiO particles in Li1.1Mn1.9O4 cathode. |
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Keywords: | Spinel Manganese NiO Additive Cathode Lithium Battery |
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