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    Home > The research group of Professor Zheng Junrong of Peking University has made important progress in the research of zinc ion batteries in water system

    The research group of Professor Zheng Junrong of Peking University has made important progress in the research of zinc ion batteries in water system

    • Last Update: 2019-12-17
    • Source: Internet
    • Author: User
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    Due to the increasingly serious environmental pollution and sustainable energy consumption, renewable energy and renewable energy storage technology are becoming more and more important for social development and people's production and life Electrochemical energy storage technology is a cleaner way of energy storage In the past few decades, due to the characteristics of high energy density, good cycle stability and low self discharge, lithium-ion batteries can meet a wide range of applications However, limited lithium resources, high cost, poor safety and environmental impact hinder the large-scale application of lithium-ion batteries More and more researchers are trying to find a green, safe, low cost and good performance secondary battery which can replace lithium-ion battery In recent years, water-based zinc ion batteries, which use aqueous solution as electrolyte, have attracted people's attention due to their high conductivity, safety, non flammability and relatively simple preparation Due to its high element abundance, low price, high theoretical density of 825 MAH / g and low redox potential (- 0.763 V), zinc is considered to replace lithium-ion batteries At present, there are three main positive materials for weak acid water zinc ion batteries based on ZnSO 4 electrolyte, Prussian blue analogues, including cuhcf, znhcf, manganese dioxide polymorphs, including a-mno2, l-mno2, g-mno2, vanadium pentoxide and its derivatives In the early stage, Professor Zheng Junrong's research group of Peking University used nano-manganous oxide obtained by high-energy ball milling as the positive electrode, metal zinc foil as the negative electrode, and mixed aqueous solution containing zinc and manganese ions as the electrolyte to assemble the secondary battery At the current density of 100 Ma g-1, after At the same time, the specific capacity increased to 221 Ma h g-1 At the current density of 500 mA g-1, the specific capacity remained at 136 mahg-1 and 92% after 500 charges and discharges Through the comprehensive characterization of XRD, TEM and XPS, H + is embedded in / out of MnO 2 during the charging and discharging process The prepared rechargeable water-based zinc manganese ion battery has the characteristics of high electrochemical energy, good cycle performance, easy mass preparation, safety and environmental protection It solves the problem that hydrothermal method or in-situ electrochemical deposition method can not prepare a large number of positive materials It is expected to be used in the field of large-scale energy storage and replace lead-acid batteries, and has a broad market prospect The related work was published in ACS sustainable chem Eng ( DOI: 10.1021/acssuschemeng.8b02502 )。 Recently, the research group has designed a new multi-stage porous zinc vanadium oxide structure to solve the structural deformation caused by the lattice expansion / contraction caused by the stress generated by Zn2 + insertion / removal during the charging and discharging process of the layered vanadium oxide positive material, and the problem of poor cycle stability of the battery This Zn 0.3v2o5.1.5h2o anode has a high specific capacity of 426mah h g-1 at 0.2ag-1, showing an unprecedented long cycle stability At 10ag-1, the capacity remains 96% after 20000 cycles (Figure 2) The electrochemical mechanism is as follows: zinc ion insertion causes lattice contraction, and hydrogen hydrate ion insertion causes lattice expansion, which counteracts each other The multi-stage porous structure provides a rich contact between the cathode material and the electrolyte, shortens the ion diffusion path, relieves the stress produced in the electrochemical process and provides a buffer, which is conducive to rapid kinetics and long-term stability The three-dimensional vanadium oxide prepared by the developed electrochemical method has the characteristics of high energy density, good rate performance, stable circulation and easy preparation, which promotes the development of water-based zinc ion batteries Recently, this work was published on science advanced (DOI: 10.1126 / sciadv Aax4279) under the title of "ultra long cycle stability of aqueous zinc ion batteries with zinc vanadium oxide methods" Wang Lulu, a 16 level doctoral student in Zheng Junrong's research group, is the first author, and Professor Zheng Junrong and Professor Chen Jitao are co correspondents The related research work was supported by NSFC and Beijing National Research Center for molecular science.
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