Liu Rui, Liang Ziteng, Xiang Yuxuan, Zhao Weimin, Liu Haodong, Chen Yan, An Ke, Yang Yong
School of Materials Science and Engineering, Shandong University of Science and Technology, Qingdao 266590, China.
Collaborative Innovation Center of Chemistry for Energy Materials, State Key Laboratory for Physical Chemistry of Solid Surface, Department of Chemistry, College of Chemistry and Chemical Engineering, Xiamen University, Xiamen 361005, China.
Molecules. 2020 Feb 24;25(4):1000. doi: 10.3390/molecules25041000.
NaV(PO) was reported recently as a novel cathode material with high theoretical energy density for Sodium-ion batteries (SIBs). However, whether V/V/V multielectron reactions can be realized during the charging process is still an open question. In this work, NaV(PO) is synthesized by using a solid-state method. Its atomic composition and crystal structure are verified by X-ray diffraction (XRD) and neutron diffraction (ND) joint refinement. The electrochemical performance of NaV(PO) is evaluated in two different voltage windows, namely 2.5-3.8 and 2.5-4.3 V. V solid-state NMR (ssNMR) results disclose the presence of V in NaV(PO) when charging NaV(PO) to 4.3 V, confirming NaV(PO) is a potential high energy density cathode through realization of V/V/V multielectron reactions.
最近，NaV(PO)被报道为一种用于钠离子电池（SIBs）的具有高理论能量密度的新型阴极材料。然而，在充电过程中是否能够实现V/V/V多电子反应仍然是一个悬而未决的问题。在这项工作中，采用固态法合成了NaV(PO)。通过X射线衍射（XRD）和中子衍射（ND）联合精修对其原子组成和晶体结构进行了验证。在两个不同的电压窗口，即2.5 - 3.8 V和2.5 - 4.3 V下评估了NaV(PO)的电化学性能。V固态核磁共振（ssNMR）结果表明，当将NaV(PO)充电至4.3 V时，NaV(PO)中存在V，通过实现V/V/V多电子反应证实NaV(PO)是一种潜在的高能量密度阴极。
