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Reversible Mg-Ion Insertion in a Metastable One-Dimensional Polymorph of V2O5
Chem ( IF 19.1 ) Pub Date : 2018-02-03 , DOI: 10.1016/j.chempr.2017.12.018
Justin L. Andrews , Arijita Mukherjee , Hyun Deog Yoo , Abhishek Parija , Peter M. Marley , Sirine Fakra , David Prendergast , Jordi Cabana , Robert F. Klie , Sarbajit Banerjee

The Li-ion paradigm of battery technology is constrained by the monovalency of the Li ion. A straightforward solution is to transition to multivalent-ion chemistries, where Mg2+ is the most obvious candidate because of its size and mass. The realization of Mg batteries has faced myriad obstacles, including a sparse selection of cathode materials demonstrating the ability to reversibly insert divalent ions. Here, we provide evidence of reversible topochemical and electrochemical insertion of Mg2+ into a metastable one-dimensional polymorph of V2O5 up to a capacity of 0.33 Mg2+ per formula unit. An electrochemical capacity of 90 mA hr g−1 was retained after 100 cycles with an average operating potential of 1.65 V versus Mg2+/Mg0. Not only does ζ-V2O5 represent a rare addition to the pantheon of functional Mg battery cathode materials, but it is also distinctive in exhibiting a combination of high stability, high specific capacity, and moderately high operating voltage.



中文翻译:

V 2 O 5的亚稳一维多晶型物中可逆的Mg离子插入

电池技术的锂离子范例受锂离子的单价性约束。一个简单的解决方案是过渡到多价离子化学,其中Mg 2+由于其尺寸和质量而成为最明显的候选物。镁电池的实现面临许多障碍,包括稀疏选择的阴极材料,证明了可逆地插入二价离子的能力。在这里,我们提供了Mg 2+可逆拓扑化学和电化学插入V 2 O 5的亚稳一维多晶型物的证据,容量高达每个配方单位0.33 Mg 2+。电化学容量为90 mA hr g -1在100个循环后保留的Mg 2 +的平均工作电位为1.65 V对Mg 2+ / Mg 0。不仅ζ-V 2 ø 5代表一种罕见的除了官能镁电池正极材料神殿,但也表现出在高稳定性,高的比容量,和适度的高工作电压的组合独特的。

更新日期:2018-02-03
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