Synergetic ternary metal oxide nanodots-graphene cathode for high performance zinc energy storage |
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| Institution: | 1. Laboratory of Clean Energy Chemistry and Materials, Lanzhou Institute of Chemical Physics, Chinese Academy of Sciences, Lanzhou 730000, China;2. Center of Materials Science and Optoelectronics Engineering, University of Chinese Academy of Sciences, Beijing 100049, China;3. School of Physical Science and Technology, Lanzhou University, Lanzhou 730000, China;4. Dalian National Laboratory for Clean Energy, Chinese Academy of Sciences, Dalian 116023, China;1. Key Laboratory for Colloid and Interface Chemistry of Education Ministry, School of Chemistry and Chemical Engineering, Shandong University, Jinan 250100, China;2. College of Chemistry & Materials Science, LongYan University, LongYan 364012, China;1. Key Laboratory of Advanced Energy Materials Chemistry (Ministry of Education), College of Chemistry, Nankai University, Tianjin, 300071, PR China;2. Department of Materials Science and Engineering, College of Engineering, Peking University, Beijing, 100871, PR China;1. Universität Bremen, Energiespeicher- und Energiewandlersysteme, Bibliothekstraße 1, 28359 Bremen, Germany;2. Universität Bremen, Faculty of Production Engineering, Innovative Sensor and Functional Materials Research Group, Badgasteiner Str. 1, 28359 Bremen, Germany;3. Fraunhofer Institute for Manufacturing Technology and Advanced Materials - IFAM, Wiener Str. 12, 28359 Bremen, Germany;1. Hunan Provincial Key Laboratory of Chemical Power Sources, College of Chemistry and Chemical Engineering, Central South University, Changsha, 410083, PR China;2. Innovation Base of Energy and Chemical Materials for Graduate Students Training, Central South University, Changsha, 410083, China;3. Institute for Superconducting & Electronic Materials, University of Wollongong, Wollongong, New South Wales, 2522, Australia |
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| Abstract: | Zinc-based electrochemistry energy storage with high safety and high theoretical capacity is considered to be a competitive candidate to replace lithium-ion batteries. In electrochemical energy storage, multi-metal oxide cathode materials can generally provide a wider electrochemical stability window and a higher capacity compared with single metal oxides cathode. Here, a new type of cathode material, MnFe2Co3O8 nanodots/functional graphene sheets, is designed and used for aqueous hybrid Zn-based energy storage. Coupling with a hybrid electrolyte based on zinc sulfate and potassium hydroxide, the as-fabricated battery was able to work with a wide electrochemical window of 0.1～1.8 V, showed a high specific capacity of 660 mAh/g, delivered an ultrahigh energy density of 1135 Wh/kg and a scalable power density of 5754 W/kg (calculated based on the cathode), and displayed a long cycling life of 1000 cycles. These are mainly attributed to the valence charge density distribution in MnFe2Co3O8 nanodots, the good structural strengthening as well as high conductivity of the cathode, and the right electrolyte. Such cathode material also exhibited high electrocatalytic activity for oxygen evolution reaction and thus could be used for constructing a Zn-air battery with an ultrahigh reversible capacity of 9556 mAh/g. |
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| Keywords: | Hybrid zinc battery Cathode Ternary metal oxide Energy storage Electrochemical performance |
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