Rechargeable Mg2+/Li+, Mg2+/Na+, and Mg2+/K+ Hybrid Batteries Based on Layered VS2,ACS Applied Materials & Interfaces

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Rechargeable Mg2+/Li+, Mg2+/Na+, and Mg2+/K+ Hybrid Batteries Based on Layered VS2
ACS Applied Materials & Interfaces ( IF 8.3 ) Pub Date : 2021-11-30 , DOI: 10.1021/acsami.1c17433
Xuli Hu ₁ , Jiebang Peng ₁ , Fei Xu ₁ , Mingyue Ding _{1,

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Affiliation

Rechargeable Mg batteries have great potential in next-generation scalable energy-storage applications, but the electrochemical performance is limited by the Mg-intercalation cathodes. Hybrid batteries based on dual-cation (Mg²⁺ and alkali metal cations) electrolytes would not only improve the electrochemical performance but also induce the co-intercalation of Mg²⁺ with alkali metal cations. As previous reports overwhelmingly focus on Mg²⁺/Li⁺ hybrid batteries, in this work, Mg²⁺/Na⁺ and Mg²⁺/K⁺ hybrid batteries are constructed using a typical layered VS₂ cathode and studied in comparison with Mg²⁺/Li⁺ batteries. It is observed that Mg²⁺ could co-intercalate into VS₂ with Li⁺, Na⁺, or K⁺. However, Mg-intercalation is irreversible in the Mg²⁺/Li⁺ system, and co-intercalation of Mg²⁺ and K⁺ would cause a collapse of VS₂. Comparatively, the co-intercalation of Mg²⁺ and Na⁺ into VS₂ exhibits the highest reversibility, and the Mg²⁺/Na⁺ hybrid battery shows the best cycling stability without capacity fading within 1000 cycles. Our work highlights the co-intercalation reversibility of a non-pre-expanded layered disulfide cathode and delivers insights for the development of high-performance rechargeable Mg metal batteries.

中文翻译：

基于分层 VS2 的可充电 Mg2+/Li+、Mg2+/Na+ 和 Mg2+/K+ 混合电池

可充电镁电池在下一代可扩展的储能应用中具有巨大潜力，但电化学性能受到镁嵌入阴极的限制。基于双阳离子（Mg ²⁺和碱金属阳离子）电解质的混合电池不仅可以提高电化学性能，还可以诱导 Mg ²⁺与碱金属阳离子共嵌入。由于之前的报道压倒性地关注 Mg ²⁺ /Li ⁺混合电池，在这项工作中，Mg ²⁺ /Na ⁺和 Mg ²⁺ /K ⁺混合电池是使用典型的分层 VS ₂阴极构建的，并与 Mg 进行比较研究²⁺ /Li ⁺电池。据观察，Mg ²⁺可以与Li ⁺、Na ⁺或K ⁺共嵌入VS _{2 中}。但是，Mg ²⁺ /Li ⁺体系中的Mg-嵌入是不可逆的，Mg ²⁺和K ^{+ 的}共嵌入会导致VS ₂的坍塌。相比之下，Mg ²⁺和Na ⁺共嵌入VS ₂表现出最高的可逆性，Mg ²⁺ /Na ⁺混合动力电池在 1000 次循环内显示出最佳的循环稳定性，且容量不会衰减。我们的工作突出了非预膨胀层状二硫化物正极的共嵌入可逆性，并为高性能可充电镁金属电池的开发提供了见解。

更新日期：2021-12-08

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