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Mg-intercalation engineering of MnO_(2)electrode for high-performance aqueous magnesium-ion batteries

International Journal of Minerals,Metallurgy and Materials 2022年第11期29卷 1954-1962页

作者： Yue Zhao Bei Wang Minjie Shi Shibo An Liping Zhao Chao Yan School of Materials Science and engineering Jiangsu University of Science and TechnologyZhenjiang 212003China State Key Laboratory for Metallic Matrix Composite Materials School of Materials Science and EngineeringShanghai Jiao Tong UniversityShanghai 200240China

Rechargeable aqueous magnesium-ion batteries(MIBs)show great promise for low-cost,high-safety,and high-performance energy storage applications.Although manganese dioxide(MnO_(2))is considered as a potential electrode material for aqueous MIBs,the low electrical conductivity and unsatisfactory cycling performance greatly hinder the practical application of MnO_(2)electrode.To overcome these problems,herein,a novel Mg-intercalation engineering approach for MnO_(2)electrode to be used in aqueous MIBs is presented,wherein the structural regulation and electrochemical performance of the Mg-intercalation MnO_(2)(denoted as MMO)electrode were thoroughly investigated by density functional theory(DFT)calculations and in-situ Raman investigation.The results demonstrate that the Mg intercalation is essential to adjusting the charge/ion state and electronic band gap of MMO electrode,as well as the highly reversible phase transition of the MMO electrode during the charging-discharging process.Because of these remarkable characteristics,the MMO electrode can be capable of delivering a significant specific capacity of~419.8 mAh·g^(−1),while exhibiting a good cycling capability over 1000 cycles in 1 M aqueous MgCl_(2) electrolyte.On the basis of such MMO electrode,we have successfully developed a soft-packaging aqueous MIB with excellent electrochemical properties,revealing its huge application potential as the efficient energy storage devices.

关键词： manganese oxide aqueous batteries intercalation engineering density functional theory calculations in-situ Raman

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intercalation engineering of layered vanadyl phosphates for high performance zinc-ion batteries

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Journal of Energy Chemistry 2021年第12期30卷 239-245,I0005页

作者： Kunjie Zhu Zhiqin Sun Pei Liu Haixia Li Yijing Wang Kangzhe Cao Lifang Jiao Key Laboratory of Advanced Energy Materials Chemistry(Ministry of Education).Renewable Energy Conversion and Storage Center(ReCast) College of ChemistryNankai UniversityTianjin 30007JChina College of Chemistry and Chemical engineering Henan Province Key Laboratory of Utilization of Non-Metallic Mineral in the South of Henan.Xinyang Normal University.Xinyang.Henan 464000.China

Aqueous zinc-ion batteries(ZIBs) have attracted great attention as the candidates for large-scale energy storage system,recently,because of their low cost,environment-friendly,high safety,and high theoretical energy densities.Among the numerous cathode materials,layered structure vanadium based polyanionic compounds,such as VOPO_(4),exhibit high specific capacity for Zn ion storage.However,the low Zn ion diffusion coefficient and limited interlayer spacing make the cathodes low reversible capacity and inferior cycling stability.Herein,K ions were pre-intercalated into the VOPO_(4) layers via ions exchange adopting VOPO_(4)·2 H_(2) O as the precursor.When evaluated as the cathode for ZIBs,an excellent cycle stability of 400 cycles under a current density of 500 mA g^(-1) was achieved by the obtained KVOPO_(4) electrode,verifying the positive effect of intercalation engineering.Furtherly,a solid-solution reaction Zn ion storage mechanism was confirmed.This study provides a new insight to explore high performance cathode materials for ZIBs.

关键词： Aqueous zinc-ion batteries intercalation engineering Layered materials KVOPO_(4) Excellent performance

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Synergistically coupling of graphene quantum dots with Zn-intercalated MnO2 cathode for high-performance aqueous Zn-ion batteries

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International Journal of Minerals,Metallurgy and Materials 2023年第1期30卷 25-32页

作者： Minjie Shi Hangtian Zhu Cong Chen Jintian Jiang Liping Zhao Chao Yan School of Materials Science and engineering Jiangsu University of Science and TechnologyZhenjiang 212003China State Key Laboratory for Metallic Matrix Composite Materials School of Materials Science and EngineeringShanghai Jiao Tong UniversityShanghai 200240China Zhejiang Research Institute of Chemical Industry Co. LtdHangzhou 310012China

Cost-effective,safe,and highly performing energy storage devices require rechargeable batteries,and among various options,aqueous zinc-ion batteries(ZIBs)have shown high promise in this regard.As a cathode material for the aqueous ZIBs,manganese dioxide(MnO_(2))has been found to be promising,but certain drawbacks of this cathode material are slow charge-transfer capability and poor cycling performance.Herein,a novel design of graphene quantum dots(GQDs)integrated with Zn-intercalated MnO_(2)nanosheets is put forward to construct a 3D nanoflower-like GQDs@ZnxMnO_(2)composite cathode for aqueous ZIBs.The synergistic coupling of GQDs modification with Zn intercalation provides abundant active sites and conductive medium to facilitate the ion/electron transmission,as well as ensure the GQDs@ZnxMnO_(2)composite cathode with enhanced charge-transfer capability and high electrochemical reversibility,which are elucidated by experiment results and in-situ Raman investigation.These impressive properties endow the GQDs@ZnxMnO_(2)composite cathode with superior aqueous Zn^(2+) storage capacity(~403.6 mAh·g^(−1)),excellent electrochemical kinetics,and good structural stability.For actual applications,the fabricated aqueous ZIBs can deliver a substantial energy density(226.8 W·h·kg^(−1)),a remarkable power density(650 W·kg^(−1)),and long-term cycle performance,further stimulating their potential application as efficient electrochemical storage devices for various energy-related fields.

关键词： synergistically coupling intercalation engineering graphene quantum dots manganese oxides aqueous batteries

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