Institute for Superconducting and Electronic Materials, Australian Institute for Innovative Materials, University of Wollongong , Innovation Campus, Squires Way, North Wollongong, NSW 2522, Australia.
Australian Synchrotron, 800 Blackburn Road, Clayton, VIC 3168, Australia.
ACS Appl Mater Interfaces. 2017 Feb 1;9(4):3644-3652. doi: 10.1021/acsami.6b13830. Epub 2017 Jan 17.
The tunnel-structured NaMnO is considered as a promising cathode material for sodium-ion batteries because of its unique three-dimensional crystal structure. Multiangular rod-shaped NaMnO have been first synthesized via a reverse microemulsion method and investigated as high-rate and long-life cathode materials for Na-ion batteries. The microstructure and composition of prepared NaMnO is highly related to the sintering temperature. This structure with suitable size increases the contact area between the material and the electrolyte and guarantees fast sodium-ion diffusion. The rods prepared at 850 °C maintain specific capacity of 72.8 mA h g and capacity retention of 99.6% after 2000 cycles at a high current density of 1000 mA g. The as-designed multiangular NaMnO provides new insight into the development of tunnel-type electrode materials and their application in rechargeable sodium-ion batteries.
隧道结构的 NaMnO 因其独特的三维晶体结构而被认为是一种很有前途的钠离子电池正极材料。本文通过反相微乳液法首次合成了具有多角棒状形貌的 NaMnO，并将其作为高倍率长寿命钠离子电池正极材料进行了研究。制备的 NaMnO 的微观结构和组成与烧结温度密切相关。这种具有合适尺寸的结构增加了材料与电解质的接触面积，并保证了钠离子的快速扩散。在 850°C 下制备的棒状 NaMnO 在 1000 mA g 的高电流密度下循环 2000 次后，仍保持 72.8 mA h g 的比容量和 99.6%的容量保持率。本设计的多角 NaMnO 为隧道型电极材料的发展及其在可充电钠离子电池中的应用提供了新的思路。
