Sodium Distribution and Reaction Mechanisms of a Na3V2O2(PO4)2F Electrode during Use in a Sodium-Ion Battery
Sodium Distribution and Reaction Mechanisms of a Na3V2O2(PO4)2F Electrode during Use in a Sodium-Ion Battery
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DOI：
10.1021/cm5005104
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发表时间：
2014-05
影响因子：
8.6
通讯作者：
N. Sharma;P. Serras;V. Palomares;H. Brand;J. Alonso;P. Kubiak;M. L. Fdez-Gubieda;T. Rojo
中科院分区：
文献类型：
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作者：
N. Sharma;P. Serras;V. Palomares;H. Brand;J. Alonso;P. Kubiak;M. L. Fdez-Gubieda;T. Rojo
室温钠离子电池正在成为商业上占主导地位的锂离子电池的令人兴奋的替代品，用于更大规模的固定应用。为了实现这样的钠离子电池，需要开发、理解和改进电极。这里，从钠的角度研究Na 3V 2 O2（PO 4）2F。该阴极在电池功能期间的反应机制包括以下：包含具有细微变化的钠组成的至少三相的区域，其通过两个两相反应机制转变，其在充电和放电期间均出现在较低电位平台状区域;用于大部分循环过程的扩展固溶体区域，包括大部分较高电位平台;以及在充电期间接近最高充电状态并且在放电期间在第一和第二类平台区域之间的第二两相区域。值得注意的是，在反应机制，晶格和体积演变的电荷的明显的不对称性…
Ambient temperature sodium-ion batteries are emerging as an exciting alternative to commercially dominant lithium-ion batteries for larger scale stationary applications. In order to realize such a sodium-ion battery, electrodes need to be developed, understood, and improved. Here, Na3V2O2(PO4)2F is investigated from the perspective of sodium. Reaction mechanisms for this cathode during battery function include the following: a region comprising at least three phases with subtly varying sodium compositions that transform via two two-phase reaction mechanisms, which appears at the lower potential plateau-like region during both charge and discharge; an extended solid solution region for majority of the cycling process, including most of the higher potential plateau; and a second two-phase region near the highest charge state during charge and between the first and second plateau-like regions during discharge. Notably, the distinct asymmetry in the reaction mechanism, lattice, and volume evolution on charge ...