Beladi-Mousavi Seyyed Mohsen, Plutnar Jan, Pumera Martin
Center for the Advanced Functional Nanorobots, Department of Inorganic Chemistry, University of Chemistry and Technology, Technická 5, Prague 6 166 28, Czech Republic.
Department of Medical Research, China Medical University Hospital, China Medical University, No. 91 Hsueh-Shih Road, Taichung 40402, Taiwan.
ACS Appl Mater Interfaces. 2020 Dec 16;12(50):55936-55944. doi: 10.1021/acsami.0c16802. Epub 2020 Dec 6.
Aqueous batteries provide safety, but they usually suffer from low energy and short lifetimes, limiting their use for large-scale energy storage. Two-dimensional materials with infinite lateral dimensions have inherent properties such as high surface area and remarkable power density and cycling stability that are shown to be critical for the next generation of energy storage systems. Here, ultrathin bismuthene oxide with a large aspect ratio is studied as an anode material for rechargeable aqueous metal-ion batteries. The metal oxides are prepared via a novel electrochemical system allowing for a smooth, high-quality transition of bismuthene to bismuthene oxide in a short time. This anodic system is shown to overcome major limiting factors of such batteries, including low capacity and irreversible and unstable redox reactions in aqueous electrolytes. The essential energy storage properties of two-dimensional (2D) microsheets, without the addition of conductive additives and binders, are compared with those of the corresponding three-dimensional (3D) structures. Notably, the battery performance of 2D microsheets is significantly better than that of nanoparticles from all examined aspects, including power density and potential and cycling stability, while exhibiting a capacity density close to their theoretical value. Moreover, 2D microsheets have shown impressive mechanical flexibility related to the ultrathin thickness of individual microsheets and strong interaction between them after film deposition. Combining the excellent energy storage properties of bismuthene oxide, the simple electrode preparation procedure, the inherent flexing characteristic, and the nontoxicity of both the battery material and the electrolyte makes this 2D material an exceptional candidate for large-scale wearable green electronics.
水系电池具有安全性，但通常能量较低且寿命较短，这限制了它们在大规模储能中的应用。具有无限横向尺寸的二维材料具有诸如高表面积、出色的功率密度和循环稳定性等固有特性，这些特性对于下一代储能系统至关重要。在此，研究了具有大纵横比的超薄氧化铋作为可充电水系金属离子电池的负极材料。通过一种新型电化学系统制备金属氧化物，该系统能够在短时间内实现铋向氧化铋的平滑、高质量转变。结果表明，这种阳极系统克服了此类电池的主要限制因素，包括低容量以及水系电解质中不可逆和不稳定的氧化还原反应。在不添加导电添加剂和粘结剂的情况下，将二维（2D）微片的基本储能性能与相应的三维（3D）结构的储能性能进行了比较。值得注意的是，从所有考察的方面来看，包括功率密度、电位和循环稳定性，二维微片的电池性能明显优于纳米颗粒，同时其容量密度接近理论值。此外，二维微片由于单个微片的超薄厚度以及成膜后它们之间的强相互作用而表现出令人印象深刻的机械柔韧性。氧化铋优异的储能性能、简单的电极制备工艺、固有的柔韧性以及电池材料和电解质的无毒特性，使得这种二维材料成为大规模可穿戴绿色电子产品的理想候选材料。
