Lei Wang, Fei Huang, Xinmei Song, Jiayi Li, Guoyin Zhu, Zhong Jin, Zhihui Dai
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引用次数: 0
Abstract
Sodium-ion batteries (SIBs) are considered one of the promising candidates for energy storage devices due to the low cost and low redox potential of sodium. However, their implementation is hindered by sluggish kinetics and rapid capacity decay caused by inferior conductivity, lattice deterioration, and volume changes of conversion-type anode materials. Herein, we report the design of a multicore-shell anode material based on manganese selenide (MnSe) nanoparticle encapsulated N-doped carbon (MnSe@NC) nanorods. Benefiting from the conductive multicore-shell structure, the MnSe@NC anodes displayed prominent rate capability (152.7 mA h g-1 at 5 A g-1) and long lifespan (132.7 mA h g-1 after 2000 cycles at 5 A g-1), verifying the essence of reasonable anode construction for high-performance SIBs. Systematic in situ microscopic and spectroscopic methods revealed a highly reversible conversion reaction mechanism of MnSe@NC. Our study proposes a promising route toward developing advanced transition metal selenide anodes and comprehending electrochemical reaction mechanisms toward high-performance SIBs.
钠离子电池(SIB)因其低成本和钠的低氧化还原电位而被认为是储能设备中最有前途的候选方案之一。然而,由于转换型负极材料的电导率低、晶格劣化和体积变化导致的动力学迟缓和容量快速衰减,阻碍了它们的应用。在此,我们报告了一种基于硒化锰(MnSe)纳米粒子封装掺杂 N 的碳(MnSe@NC)纳米棒的多核壳阳极材料的设计。得益于导电性多核壳结构,MnSe@NC 阳极显示出突出的速率能力(5 A g-1 时为 152.7 mA h g-1)和长寿命(5 A g-1 时循环 2000 次后为 132.7 mA h g-1),验证了高性能 SIB 合理阳极结构的本质。系统的原位显微和光谱方法揭示了 MnSe@NC 的高度可逆转换反应机制。我们的研究为开发先进的过渡金属硒化物阳极和理解高性能 SIB 的电化学反应机制提出了一条前景广阔的途径。
期刊介绍:
Nano Letters serves as a dynamic platform for promptly disseminating original results in fundamental, applied, and emerging research across all facets of nanoscience and nanotechnology. A pivotal criterion for inclusion within Nano Letters is the convergence of at least two different areas or disciplines, ensuring a rich interdisciplinary scope. The journal is dedicated to fostering exploration in diverse areas, including:
- Experimental and theoretical findings on physical, chemical, and biological phenomena at the nanoscale
- Synthesis, characterization, and processing of organic, inorganic, polymer, and hybrid nanomaterials through physical, chemical, and biological methodologies
- Modeling and simulation of synthetic, assembly, and interaction processes
- Realization of integrated nanostructures and nano-engineered devices exhibiting advanced performance
- Applications of nanoscale materials in living and environmental systems
Nano Letters is committed to advancing and showcasing groundbreaking research that intersects various domains, fostering innovation and collaboration in the ever-evolving field of nanoscience and nanotechnology.