We describe Na0.67Mn0.625Fe0.25Co0.125O2 (NMFCO), a P2-type sodium-ion battery cathode. Our composition, with significantly less Co than in an earlier study, shows discharge capacity close to 190 mAhg-1 and specific energy density exceeding 500 mWhg-1 in the 1.5 to 4.3 V range. The material also shows an improved structural stability over similar materials. Such changes, between the pristine phase (P63/mmc, P63 (OP4), or orthorhombic Cmcm) and the so-called Z phase, are endemic to other P2-type cathodes such as Na0.67Mn0.65Fe0.35O2 (NMFO). We propose two equivalent circuit models of impedance spectroscopy to understand electrochemical processes in our cells with a sodium metal anode. Our equivalent circuit modeling, combined with an analysis of the initial galvanostatic slope, reveals a significant reduction in the polarization and interfacial charge-transfer resistance at the solid electrolyte interface. We reveal that the combined effects of crystal structure stability, lower internal resistance, relatively high specific energy density, and improved battery health make this low-cobalt P2-type cathode composition a very promising candidate for new sodium-ion batteries.
Effect of Decreasing Cobalt Content on the Electrochemical Properties and Structural Stability of Li_(1-x)Ni_(y)Co_(z)Al_(0.05)O_(2) Type Cathode Materials
Mixed eldfellite compounds \ce{Na(Fe_{1/2}M_{1/2})(SO4)2} (M = Mn, Co, Ni): A new family of high electrode potential cathodes for the sodium-ion battery
Crystal structure, cobalt and iron speciation and oxygen non-stoichiometry of La0.6Sr0.4Co1-yFeyO3-d nanorods for IT-SOFC cathodes
Pontificia Universidad Javeriana(波哥大耶稣会天主教大学);Centro Atómico Constituyentes, Comisión Nacional de Energía Atómica(康塞普西翁原子中心,国家原子能委员会);Instituto de Nanociencia y Nanotecnología (INN), CNEA-CONICET(纳米科学与技术研究所,国家原子能委员会-国家科学研究和技术研究委员会);CONICET / Laboratorio de Cristalografía Aplicada, Escuela de Ciencia y Tecnología, Universidad Nacional de Gral. San Martín(国家科学研究和技术研究委员会/应用晶体学实验室,科学与科技学院,圣马丁国立大学);CNPEM, Laboratório Nacional de Luz Síncrotron(巴西纳米技术国家研究中心,同步光国家实验室);Instituto de Física, Universidade de São Paulo(物理研究所,圣保罗大学)
Ionic Diffusion and Electronic Transport in Eldfellite Na$_x$Fe(SO$_4$)$_2$
发现钠离子电池的新电极需要清楚地了解电池运行过程中的材料过程。使用第一性原理计算,我们确定了新开发的阴极材料,eldfellite Na $_x$ Fe(SO $_4$)$_2$的离子扩散和电子转移的机制,再现的电化学性能与实验吻合良好。插入的钠原子被建议沿二维路径扩散的主机钠原子的前运动,和活化能计算是合理的快速插入。我们计算的电子性质,显示带绝缘在低组成的插入钠,电子极化子的形成和希望也建议。我们的研究结果可能有助于开辟一条新的途径,开发创新的正极材料基于铁和硫酸根离子。
Improved Electrochemical Performance and Diffusion kinetics by Boron-doping in Na$_{0.66}$Mn$_{0.8}$Fe$_{0.2}$O$_{2}$ Layered Cathodes for Sodium-Ion Batteries
Indian Institute of Technology Delhi(印度德里理工学院);Hindu College, University of Delhi(德里大学印度教学院);Indian Institute of Technology Delhi-Abu Dhabi(印度德里理工学院阿布扎比分校)
Electrochemical performance and diffusion kinetics of a NASICON type Na$_{3.3}$Mn$_{1.2}$Ti$_{0.75}$Mo$_{0.05}$(PO$_4$)$_3$/C cathode for low-cost sodium-ion batteries
Unraveling the storage mechanism of Na$_{3}$V$_{2-x}$Ni$_x$(PO$_4$)$_2$F$_3$/C cathodes for sodium-ion batteries through electrochemical, {\it operando} X-ray diffraction and microscopy studies
本研究结合 EIS、GITT、CV、operando XRD 与原位同步辐射 TXM,揭示 Ni 掺杂 Na₃V₂(PO₄)₂F₃/C 正极的储钠机制、扩散动力学及长循环稳定性。
Mixed Polyanionic NaFe$_{1.6}$V$_{0.4}$(PO$_{4}$)(SO$_{4}$)$_{2}$@CNT Cathode for Sodium-ion Batteries: Electrochemical Diffusion Kinetics and Distribution of Relaxation Time Analysis at Different Temperatures
High-Voltage Honeycomb Layered Oxide Positive Electrodes for Rechargeable Sodium Batteries
丰富的自然资源、令人印象深刻的化学特性和经济可行性重新点燃了可充电钠(Na)电池的吸引力,使其成为满足不断增长的能源需求、环境可持续性和能源独立性的实用解决方案。然而,可行的正极材料的稀缺仍然是该技术实现的巨大障碍。在本文中,我们探索蜂窝层状氧化物采用的组合物Na $_2$ Ni $_{2-x}$ Co $_x$ TeO $_6$($x = 0, 0.25$和$0.50$)作为可行的正极(阴极)材料的可充电钠电池在室温和高温下使用离子液体。通过标准的恒电流评估和分析,我们证明在Na $_2$ Ni $_2$ TeO $_6$中用钴取代镍导致放电电压增加到接近$4$ V(相对于Na $^+$ / Na)对于Na $_2$ Ni $_{2-x}$ Co $_x$ TeO $_6$族蜂窝状层状氧化物材料,其超过了促进Na离子脱离的大多数层状氧化物正极材料所获得的平均电压。我们还验证了在高温下操作期间Na $_2$ Ni $_{2-x}$ Co $_x$ TeO $_6$蜂窝状层状氧化物内的增加的动力学,这导致可再充电Na电池的可逆容量增加。这项研究支持的同源过渡金属原子掺杂的蜂窝结构的Na $_2$ Ni $_2$ TeO $_6$除了作为一个明智的路线,以提高类似的层状氧化物的电化学性能的高温操作。
Comparative computational study of lithium and sodium insertion in van der Waals and covalent tetracyanoethylene (TCNE) -based crystals as promising materials for organic lithium and sodium ion batteries
我们提出了一个比较从头计算研究Li和Na插入分子(范德华)晶体TCNE(四氰基乙烯)以及在共价Li/Na-TCNE晶体。我们确认了先前合成的(共价)Li-TCNE晶体的结构,并预测其Na-TCNE类似物的存在。在分子/共价TCNE晶体中,插入位点被确定与Li和Na的结合能高达2.7/1.8和2.6/1.8 eV强于Li和Na的内聚能,分别在稀浓度。每个TCNE单元可以分别插入高达5.5/2.5和3/2的Li和Na原子,同时保持结构,最大电压分别为3.5/2.2和3.3/2.7 V。对于分子晶体中的Li和Na,容量高达418 mAh g-1,对于共价晶体中的Li,容量高达198 mAh g-1,对于Na,容量高达177 mAh g-1,Li和Na的插入不会导致与普通电解质的反应。因此,四氰基乙烯基分子和共价晶体可以成为有效的锂和钠离子电池的有机阴极和阳极材料。
Temperature-driven sodium-ion dynamical-to-static crossover in the zig-zag ordered phase of Na$_{0.5}$CoO$_2$
Beijing Academy of Quantum Information Sciences(北京量子信息科学研究院);Key Laboratory of Artificial Structures and Quantum Control (Ministry of Education), School of Physics and Astronomy, Shanghai Jiao Tong University(上海交通大学物理与天文学院人工结构与量子控制教育部重点实验室);School of Physical Science and Technology, Lanzhou University(兰州大学物理科学与技术学院);International Center for Quantum Materials, School of Physics, Peking University(北京大学物理学院物质科学量子创新中心);Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences(中国科学院物理研究所北京凝聚态物理国家实验室)
AI-Driven Phase Identification from X-ray Hyperspectral Imaging of cycled Na-ion Cathode Materials
Laboratoire de Réactivité et de Chimie des Solides (LRCS), CNRS UMR 7314, Université de Picardie Jules Verne(法国皮卡第大学劳勃-德-夏尔固体反应与化学实验室(LRCS));Réseau sur le Stockage Electrochimique de l’Energie (RS2E), CNRS FR 3459(能源电化学存储网络(RS2E));ALISTORE-European Research Institute, CNRS FR 3104(ALISTORE欧洲研究机构);Université de Picardie Jules Verne(法国皮卡第大学);Synchrotron SOLEIL(SOLEIL同步辐射光源)
Revealing the interfacial kinetic mechanisms in high-entropy doped Na$_3$V$_2$(PO$_4$)$_3$ through electrochemical investigation and distribution of relaxation times
Understanding the electrochemical performance and diffusion kinetics of HC$||$Na$_3$V$_2$(PO$_4$)$_3$/C full cell battery for energy storage applications