Defining Diffusion Pathways in Intercalation Cathode Materials: Some Lessons from V2O5 on Directing Cation Traffic,ACS Energy Letters

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Defining Diffusion Pathways in Intercalation Cathode Materials: Some Lessons from V2O5 on Directing Cation Traffic
ACS Energy Letters ( IF 19.3 ) Pub Date : 2018-03-12 00:00:00 , DOI: 10.1021/acsenergylett.8b00156
Luis R. De Jesus ₁ , Justin L. Andrews ₁ , Abhishek Parija ₁ , Sarbajit Banerjee ₁

Affiliation

The invention of rechargeable batteries has dramatically changed our landscapes and lives, underpinning the explosive worldwide growth of consumer electronics, ushering in an unprecedented era of electric vehicles, and potentially paving the way for a much greener energy future. Unfortunately, current battery technologies suffer from a number of challenges, e.g., capacity loss and failure upon prolonged cycling, limited ion diffusion kinetics, and a rather sparse palette of high-performing electrode materials. Here, we discuss the origins of diffusion limitations in oxide materials using V₂O₅ as a model system. In particular, we discuss constrictions in ionic conduction pathways, narrow energy dispersion of conduction band states, and the stabilization and self-trapping of polarons as local phenomena that have substantial implications for introducing multiscale compositional and phase heterogeneities. Strategies for mitigating such limitations are discussed such as reducing diffusion path lengths and the design of metastable frameworks yielding frustrated coordination and decreased barriers for migration of polarons.

中文翻译：

定义插层阴极材料中的扩散途径：来自V ₂ O _5的一些关于指导阳离子运输的经验教训

可充电电池的发明极大地改变了我们的生活环境，支撑了全球消费电子产品的爆炸性增长，开创了电动汽车史无前例的时代，并为更绿色的能源未来铺平了道路。不幸的是，当前的电池技术遭受许多挑战，例如，长时间循环时的容量损失和故障，有限的离子扩散动力学以及高性能电极材料的相当稀疏的调色板。在这里，我们讨论使用V ₂ O ₅在氧化物材料中扩散限制的起源。作为模型系统。特别是，我们讨论了离子传导途径中的收缩，传导带态的窄能量色散以及极化子的稳定和自陷，这些极化子是局部现象，对引入多尺度成分和相异质性具有实质性影响。讨论了减轻这种局限性的策略，例如减少扩散路径的长度和设计亚稳框架，从而产生失调的配位和减少极化子迁移的障碍。

更新日期：2018-03-12

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