Kumar Saurabh, Mondal Rakesh, Prakash Rajiv, Singh Preetam
School of Materials Science and Technology, IIT(BHU), Varanasi 221005, U.P., India.
Department of Ceramic Engineering, IIT(BHU), Varanasi, 221005, U.P., India.
Dalton Trans. 2022 Aug 9;51(31):11823-11833. doi: 10.1039/d2dt00573e.
Recent global concerns over continuously increasing air pollution and the related health risks due to automobile exhaust have shifted our attention towards green transportation. Recent decades have witnessed a revolution in portable energy-storage systems, mainly lithium-based energy-storage devices. However, the uneven distribution of global lithium reserves and its scarcity lead to huge price differences and geopolitical imbalances, and hence the research in energy-storage materials has shifted towards the development of cost-effective, abundant electrode materials. Here, NaCr(SO), a transition metal-based polyanionic layered material with low cost and high stability during the charge/discharge process Na, operating on the basis of the Cr/ redox couple, is presented. The test materials were characterized by techniques like XRD, FTIR, SEM, UV, XPS, TGA-DTA, and a detailed electrochemical analysis of the charge/discharge capacity of the materials is presented here. Here, the findings provide insights towards achieving a Cr/Cr redox-couple-based sodium-ion battery with a specific capacity of 75 mA h g and 150 mA h g at operating voltages of 0.95 V Na and 1.05 V Li, respectively, with 100% coulombic efficiency. Cr is a very special oxidation of Cr that cannot be obtained easily and CrTaO is the only known oxide where Cr exists in the 2+ state. Here, a shift in the redox energy of the Cr couple was obtained due to its bonding with (SO) polyanions in eldfellite that made the accessibility of Cr possible, resulting in the superior intercalation/deintercalation of Na and Li and the superior energy-storage capacity of the NaCr(SO) Na/Li cell.
近期，全球对空气污染持续加剧以及汽车尾气造成的相关健康风险的担忧，已将我们的注意力转向绿色交通。近几十年来，便携式储能系统发生了一场革命，主要是基于锂的储能设备。然而，全球锂储量分布不均及其稀缺性导致了巨大的价格差异和地缘政治失衡，因此储能材料的研究已转向开发具有成本效益、储量丰富的电极材料。在此，介绍了NaCr(SO)，一种基于过渡金属的聚阴离子层状材料，成本低，在基于Cr/氧化还原对运行的Na的充放电过程中具有高稳定性。通过XRD、FTIR、SEM、UV、XPS、TGA-DTA等技术对测试材料进行了表征，并在此展示了对材料充放电容量的详细电化学分析。在此，研究结果为实现基于Cr/Cr氧化还原对的钠离子电池提供了见解，该电池在0.95 V Na和1.05 V Li的工作电压下，比容量分别为75 mA h g和150 mA h g，库仑效率为100%。Cr是Cr的一种非常特殊的氧化态，不容易获得，而CrTaO是唯一已知的Cr以2+态存在的氧化物。在此，由于Cr与钙板铀矿中的(SO)聚阴离子结合，获得了Cr对的氧化还原能量的转移，这使得Cr能够被利用，从而导致Na和Li的优异嵌入/脱嵌以及NaCr(SO) Na/Li电池的优异储能容量。
