Spinel-layered integrate structured nanorods with both high capacity and superior high-rate capability as cathode material for lithium-ion batteries

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• 作者：Huibing He ; Hengjiang Cong ; Ya Sun ; Ling Zan ; Youxiang Zhang
• 关键词：lithium ; ion batteries ; cathode ; layered ; spinel integrated structure ; Li2MnO3 ; nanorods
• 刊名：Nano Research
• 出版年：2017
• 出版时间：February 2017
• 年：2017
• 卷：10
• 期：2
• 页码：556-569
• 全文大小：
• 刊物类别：Chemistry and Materials Science
• 刊物主题：Nanotechnology; Materials Science, general; Atomic/Molecular Structure and Spectra; Condensed Matter Physics; Biotechnology; Biomedicine, general;
• 出版者：Tsinghua University Press
• ISSN：1998-0000
• 卷排序：10

文摘

Spinel phase LiMn<sub>2sub>O<sub>4sub> was successfully embedded into monoclinic phase layeredstructured Li<sub>2sub>MnO<sub>3sub> nanorods, and these spinel-layered integrate structured nanorods showed both high capacities and superior high-rate capabilities as cathode material for lithium-ion batteries (LIBs). Pristine Li<sub>2sub>MnO<sub>3sub> nanorods were synthesized by a simple rheological phase method using α-MnO<sub>2sub> nanowires as precursors. The spinel-layered integrate structured nanorods were fabricated by a facile partial reduction reaction using stearic acid as the reductant. Both structural characterizations and electrochemical properties of the integrate structured nanorods verified that LiMn<sub>2sub>O<sub>4sub> nanodomains were embedded inside the pristine Li<sub>2sub>MnO<sub>3sub> nanorods. When used as cathode materials for LIBs, the spinel-layered integrate structured Li<sub>2sub>MnO<sub>3sub> nanorods (SL-Li<sub>2sub>MnO<sub>3sub>) showed much better performances than the pristine layered-structured Li<sub>2sub>MnO<sub>3sub> nanorods (L-Li2MnO3). When charge–discharged at 20 mA·g−1 in a voltage window of 2.0–4.8 V, the SL-Li<sub>2sub>MnO<sub>3sub> showed discharge capacities of 272.3 and 228.4 mAh·g−1 in the first and the 60th cycles, respectively, with capacity retention of 83.8%. The SL-Li<sub>2sub>MnO<sub>3sub> also showed superior high-rate performances. When cycled at rates of 1 C, 2 C, 5 C, and 10 C (1 C = 200 mA·g−1) for hundreds of cycles, the discharge capacities of the SL-Li<sub>2sub>MnO<sub>3sub> reached 218.9, 200.5, 147.1, and 123.9 mAh·g−1, respectively. The superior performances of the SL-Li<sub>2sub>MnO<sub>3sub> are ascribed to the spinel-layered integrated structures. With large capacities and superior high-rate performances, these spinel-layered integrate structured materials are good candidates for cathodes of next-generation high-power LIBs.