Yang Peilei, Zhang Chaoyang, Li Malin, Yang Xu, Wang Chunzhong, Bie Xiaofei, Wei Yingjin, Chen Gang, Du Fei
Key Laboratory of Physics & Technology for Advanced Batteries (Ministry of Education), College of Physics, Jilin University, Changchun, 130012, P. R. China), Fax: (+86) 431-85155126.
State Key Laboratory of Superhard Materials, Jilin University, Changchun, 130012, P. R. China.
Chemphyschem. 2015 Nov 16;16(16):3408-12. doi: 10.1002/cphc.201500599. Epub 2015 Sep 9.
As a promising positive electrode material for sodium-ion batteries (SIBs), layered sodium oxides have attracted considerable attention in recent years. In this work, stoichiometric P2-phase NaCo(0.5)Mn(0.5)O2 was prepared through the conventional solid-state reaction, and its structural and physical properties were studied in terms of XRD, XPS, and magnetic susceptibility. Furthermore, the P2-NaCo(0.5)Mn(0.5)O2 electrode delivered a discharge capacity of 124.3 mA h g(-1) and almost 100% initial coulombic efficiency over the potential window of 1.5-4.15 V. It also showed good cycle stability, with a reversible capacity and capacity retention reaching approximately 85 mA h g(-1) and 99%, respectively, at the 5 C rate after 100 cycles. Additionally, cyclic voltammetry and ex situ XRD were employed to explain the electrochemical behavior at the different electrochemical stages. Owing to the applicable performances, P2-NaCo(0.5)Mn(0.5)O2 can be considered as a potential positive electrode material for SIBs.
作为一种有前景的钠离子电池（SIBs）正极材料，层状氧化钠近年来受到了广泛关注。在这项工作中，通过传统的固态反应制备了化学计量比的P2相NaCo(0.5)Mn(0.5)O2，并通过X射线衍射（XRD）、X射线光电子能谱（XPS）和磁化率对其结构和物理性质进行了研究。此外，P2-NaCo(0.5)Mn(0.5)O2电极在1.5-4.15 V的电位窗口内提供了124.3 mA h g(-1)的放电容量和几乎100%的初始库仑效率。它还表现出良好的循环稳定性，在100次循环后，在5 C倍率下的可逆容量和容量保持率分别达到约85 mA h g(-1)和99%。此外，采用循环伏安法和非原位XRD来解释不同电化学阶段的电化学行为。由于其适用的性能，P2-NaCo(0.5)Mn(0.5)O2可被视为一种潜在的SIBs正极材料。
