Abstract
The low-cost and high-safety rechargeable zinc-ion batteries (ZIBs) show promising applications for large-scale energy storage. However, the (de)intercalation of divalent zinc ions with high charge density restricts cathode materials’ choice. Na3V2(PO4)3 (NVP) is one of the sodium (Na) super-ionic conductor materials that shows feasible utilization in aqueous ZIBs but universally has poor cycle life, commonly limited to 200 cycles or less. In this study, we investigate the capacity degradation mechanism of NVP systematically and then propose a novel organic dual-salt electrolyte to realize excellent cycling stability. We find a spontaneous dissolution of NVP when immersed in the static aqueous electrolyte, and there is an irreversible phase change during the first discharge process, leading to a fast capacity fading in aqueous electrolytes. The dissolution problem can be effectively suppressed by non-aqueous Zn2+-containing electrolytes. However, the sluggish reaction of Zn2+ intercalation into NVP causes poor reversibility. We develop a non-aqueous Na/Zn hybrid system by adding Na+ ions as charge carriers to address this issue. Highly reversible co-insertion of Na/Zn ions into the NVP enables a high capacity of 84 mA h−1 and an outstanding lifetime of 600 cycles at 500 mA g−1 without capacity loss. This work provides valuable views on the NVP’s failure mechanisms that will be helpful for ZIB development.
摘要
开发高性能正极材料是限制锌离子电池发展的重要因素. Na3V2(PO4)3 (NVP)是一种典型NASICON结构的材料, 其作为锌离 子电池正极材料具有较高的工作电压, 然而其循环性能较差, 通常 仅200圈. 本文首次系统地研究了该材料储锌性能的衰退机理. 研究 表明, 在水系电解液中NVP的自发溶解及首圈放电过程中材料的 不可逆相变是其容量衰退的主要原因. 采用含锌有机电解液虽可 避免其溶解, 但锌离子的嵌入易导致晶体结构的坍塌. 本文首次引 入钠离子作为新的载流子并构建有机Na/Zn混合离子电解液. 其 中, 两种金属离子在NVP中高度可逆的共插层反应助力Zn/Na3V2-(PO4)3电池实现了84 mA h g−1的较高容量以及在大电流密度下循 环600圈容量零衰减的高稳定性.
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Acknowledgements
This work was supported by the National Natural Science Foundation of China (91963210, U1801255, and 51872340) and the Fundamental Research Funds for the Central Universities, China (18lgpy06).
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Wang C and Yang G designed this work; Li Q synthesized the materials and carried out the electrochemical experiments; Li Q performed the ex-situ XRD measurements with Ma K and Hong C; Wang C, Yang G, and Li Q wrote the paper. All the authors participated in the analysis of experimental data and discussions of the results.
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The authors declare that they have no conflict of interest.
Qian Li received his BS degree from the School of Minerals Processing and Bioengineering at Central South University in 2017. Now he is pursuing his PhD under the direction of Prof. Chengxin Wang in the School of Materials Science and Engineering at Sun Yat-sen University (SYSU). His current research focuses on rechargeable zinc-ion batteries.
Gongzheng Yang is an associate professor at the School of Materials Science and Engineering, SYSU. He received his PhD degree from SYSU in 2014. He carried out his postdoctoral research in the laboratory of Prof. Chengxin Wang in SYSU. Currently, his research interest includes energy-storage materials and devices.
Chengxin Wang is a professor in the School of Materials Science and Engineering at SYSU. Dr. Wang’s research interest lies in both theoretical and experimental investigations on the nanomaterials of IV main group elements and related compounds. His current research focuses on nano energy materials.
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Realizing excellent cycle stability of Zn/Na3V2(PO4)3 batteries by suppressing dissolution and structural degradation in non-aqueous Na/Zn dual-salt electrolytes
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Li, Q., Ma, K., Hong, C. et al. Realizing excellent cycle stability of Zn/Na3V2(PO4)3 batteries by suppressing dissolution and structural degradation in non-aqueous Na/Zn dual-salt electrolytes. Sci. China Mater. 64, 1386–1395 (2021). https://doi.org/10.1007/s40843-020-1550-2
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DOI: https://doi.org/10.1007/s40843-020-1550-2