Yu Baozhu, Lu Leilei, He Yuting, Dai Xin, Wang Yi, Wang Tian, Chong Shaokun, Liu Liting, Liu Yongning, Tan Qiang
Department of Applied Chemistry, Xi'an University of Technology, Xi'an, Shaanxi, 710048, China; State Key Laboratory for Mechanical Behavior of Materials, School of Material Science and Engineering, Xi'an Jiaotong University, Xi'an 710049, China.
Department of Applied Chemistry, Xi'an University of Technology, Xi'an, Shaanxi, 710048, China.
J Colloid Interface Sci. 2024 Jan 15;654(Pt A):56-65. doi: 10.1016/j.jcis.2023.10.009. Epub 2023 Oct 5.
Aqueous zinc-ion batteries (ZIBs) have been considered one of the most promising flexible chemical power sources, because of their affordable cost, absolute security, and lightweight. However, the development of flexible aqueous ZIBs has been hindered by cathode materials due to their unsatisfied capacity, unstable structure, and ambiguous electrochemical energy storage mechanism. To address the above issues, a high-performance manganese cerium-doped dioxide-based core-shell hybrid structure cathode (CS@Ce-MnO) has been successfully prepared via a facile low-temperature liquid-phase reaction strategy. Benefit from the delicately designed hierarchical carbon spheres core and cerium-doped manganese dioxide nanosheets shell structure, the capacity and stability of CS@Ce-MnO based flexible ZIBs has been dramatically improved, and the origin of the improved electrochemical performance and storage mechanism was demonstrated by electrochemical methods and ex-site x-ray diffraction (XRD) and scanning electron microscopy (SEM). The principal reason for the high reversible specific capacity is the plausible Zn and Hco-insertion/extraction, while the porous structure of the carbon spheres contributes to the improved electron conduction and ion transport in the MnO matrix. This work provides a new opportunity for high-performance flexible aqueous zinc-ion batteries.
水系锌离子电池（ZIBs）因其成本低廉、绝对安全且重量轻，被认为是最有前景的柔性化学电源之一。然而，由于阴极材料容量不足、结构不稳定以及电化学储能机制不明确，柔性水系ZIBs的发展受到了阻碍。为了解决上述问题，通过一种简便的低温液相反应策略成功制备了一种高性能的基于锰铈掺杂二氧化物的核壳混合结构阴极（CS@Ce-MnO）。得益于精心设计的分级碳球核和铈掺杂二氧化锰纳米片壳结构，基于CS@Ce-MnO的柔性ZIBs的容量和稳定性得到了显著提高，并且通过电化学方法以及非原位X射线衍射（XRD）和扫描电子显微镜（SEM）证明了电化学性能提高的起源和储能机制。高可逆比容量的主要原因是合理的锌和碳酸氢根嵌入/脱出，而碳球的多孔结构有助于改善MnO基体中的电子传导和离子传输。这项工作为高性能柔性水系锌离子电池提供了新的机遇。
