Dataset of "Electrolyte Effects and Stability of Zn/Li Dual-Ion Batteries with Water-in-Salt Electrolytes"

Aqueous zinc-ion batteries have emerged as promising candidates for safe and cost-effective energy storage, yet their performance remains constrained by electrode stability and electrolyte composition. In this study, we investigate the electrochemical behavior of various electrode materials in utilizing water-in-salt dual-ion electrolytes. Our findings highlight the critical influence of substrate materials on electrochemical stability, with titanium exhibiting superior anodic stability compared to, e.g., aluminum. Furthermore, we demonstrate the feasibility of LiFePO4 as a positive electrode, revealing a redox potential of 1.17 V vs. Zn²⁺/Zn in chloride-based electrolyte, which shifts positively with increasing lithium concentration. The observed potential variation with electrolyte composition underscores the need for optimized formulations to enhance the battery performance. Additionally, while LiMnPO4 offers a higher theoretical voltage, its cycling stability remains limited, suggesting that material modifications are necessary. Finally, we highlight the overlooked impact of electrolyte impurities on battery performance, emphasizing the importance of high-purity electrolyte components. These insights contribute to the development of more stable and efficient Zn-ion batteries, paving the way for their practical deployment in energy storage applications.水系锌离子电池（Aqueous zinc-ion batteries）已成为安全且低成本储能领域极具前景的候选技术，但其性能仍受限于电极稳定性与电解液组成。本研究针对多种电极材料在盐包水双离子电解质（water-in-salt dual-ion electrolytes）中的电化学行为展开探究。研究结果凸显了基底材料对电化学稳定性的关键影响：相较于铝等材料，钛基基底展现出更优异的阳极稳定性。此外，本研究证实了磷酸铁锂（LiFePO4）作为正极材料的可行性，在氯化物基电解液中测得其相对于Zn²⁺/Zn参比电极的氧化还原电位为1.17 V，且该电位随锂盐浓度升高正向偏移。观察到的电位随电解液组分变化的现象，也凸显了优化电解液配方以提升电池性能的必要性。与此同时，尽管磷酸锰锂（LiMnPO4）具备更高的理论电压，但其循环稳定性仍存在局限，表明需对该材料进行改性处理。最后，本研究还指出了电解液杂质对电池性能长期被忽视的影响，强调了高纯度电解液组分的重要性。上述研究成果可为开发更稳定、高效的锌离子电池提供理论支撑，为其在储能领域的实际应用铺平道路。