Electrochemical characterization of P2-type layered Na2/3Ni1/4Mn3/4O2 cathode in aqueous hybrid sodium/lithium ion electrolyte |
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| Affiliation: | 1. Shanghai Institute of Ceramics, Chinese Academy of Sciences, Shanghai 200050, PR China;2. University of Chinese Academy of Sciences, Beijing 100049, PR China;3. State Grid Electric Power Research Institute, SMEPC, PR China;4. Shanghai Electric Sodium-sulfur Batteries Energy-Storage Technology Co., Ltd, PR China;1. State Key Laboratory of Rare Earth Resource Utilization, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun 130022, China;2. Materials Research Institute, Materials Research Laboratory, The Pennsylvania State University, University Park, PA 16802, USA;3. School of Materials Science and Engineering, Changzhou University, Changzhou 213164, China;4. School of Environmental and Safety Engineering, Changzhou University, Changzhou 213164, China;5. School of Chemical Engineering, Dalian University of Technology, Dalian 116024, China;1. New Energy and Material Laboratory (NEML), Department of Chemistry, Fudan University, Shanghai 200433, China;2. College of Chemistry and Chemical Engineering, Jiangxi Normal University, Nanchang 330022, China;3. Technische Universität Chemnitz, Institut für Chemie, AG Elektrochemie, D-09107 Chemnitz, Germany;1. Shanghai Institute of Ceramics, Chinese Academy of Sciences, Shanghai 200050, PR China;2. University of Chinese Academy of Sciences, Beijing 100049, PR China;1. State Key Laboratory of Material Processing and Die & Mould Technology, School of Materials Science and Engineering, Huazhong University of Science and Technology (HUST), Wuhan 430074, Hubei, PR China;2. Key Laboratory of Advanced Energy Materials Chemistry (Ministry of Education), Nankai University, Tianjin 300071, PR China;1. Karlsruhe Institute of Technology (KIT), Institute for Applied Materials (IAM), Hermann-von- Helmholtz-Platz 1, D-76344 Eggenstein-Leopoldshafen, Germany;2. Leibniz Institute for Solid State and Materials Research (IFW) Dresden e.V., Institute for Complex Materials, Helmholtzstr. 20, D-01069 Dresden, Germany;3. University of Augsburg, Experimental Physics VI, Center for Electronic Correlations and Magnetism, Universitaetsstr. 1, D-86159 Augsburg, Germany;4. CELLS-ALBA Synchrotron, Carrer de la Llum 2-26, Cerdanyola del Vallès, E-08290 Barcelona, Spain |
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| Abstract: | P2-type layered Na2/3Ni1/4Mn3/4O2 has been synthesized by a solid-state method and its electrochemical behavior has been investigated as a potential cathode material in aqueous hybrid sodium/lithium ion electrolyte by adopting activated carbon as the counter electrode. The results indicate that the Na+/Li+ ratio in aqueous electrolyte has a strong influence on the capacity and cyclic stability of the Na2/3Ni1/4Mn3/4O2 electrode. Increase on the Li+ content leads to a shift of the redox potential towards a high value, which is favorable for the improvement of the working voltage of the layered material as cathode. It is found that the coexistence of Na+ and Li+ in aqueous electrolyte can improve the cyclic stability for the Na2/3Ni1/4Mn3/4O2 electrode. A reversible capacity of 54 mAh g−1 was obtained with a high cyclability as the Na+/Li+ ratio was 2:2. Furthermore, an aqueous hybrid ion cell was assembled with the as-proposed Na2/3Ni1/4Mn3/4O2 as cathode and NaTi2(PO4)3/graphite synthesized in this work as anode in 1 M Na2SO4/Li2SO4 (mole ratio as 2:2) mixed electrolyte. The cell shows an average discharge voltage at 1.2 V, delivering an energy density of 36 Wh kg−1 at a power density of 16 W kg−1 based on the total mass of the active materials. |
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| Keywords: | Aqueous batteries Hybrid ion electrolyte |
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