Designing a Magnesium/Sodium Hybrid Battery Using Hierarchical Iron Selenide Architecture as Cathode Material and Modified Dual-Ion Salts in Ether as Electrolyte,Nano Letters

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Designing a Magnesium/Sodium Hybrid Battery Using Hierarchical Iron Selenide Architecture as Cathode Material and Modified Dual-Ion Salts in Ether as Electrolyte
Nano Letters ( IF 9.6 ) Pub Date : 2024-04-03 , DOI: 10.1021/acs.nanolett.4c00041
Ting Zhou ₁ , Tianli Han ₁ , Xirong Lin ₂ , Jiamin Liu ₁ , Xiangbing Zeng ₃ , Peng Zhan ₃ , Jinyun Liu ₁ , Junjie Niu ₄

Affiliation

We developed a magnesium/sodium (Mg/Na) hybrid battery using a hierarchical disk-whisker FeSe₂ architecture (HD-FeSe₂) as the cathode material and a modified dual-ion electrolyte. The polarizable Se^2– anion reduced the Mg²⁺ migration barrier, and the 3D configuration possessed a large surface area, which facilitated both Mg²⁺/Na⁺ cation diffusion and electron transport. The dual-ion salts with NaTFSI in ether reduced the Mg plating/stripping overvoltage in a symmetric cell. The hybrid battery exhibited an energy density of 260.9 Wh kg^–1 and a power density of 600.8 W kg^–1 at 0.2 A g^–1. It showed a capacity retention of 154 mAh g^–1 and a Coulombic efficiency of over 99.5% under 1.0 A g^–1 after 800 long cycles. The battery also displayed outstanding temperature tolerance. The findings of 3D architecture as cathode material and hybrid electrolyte provide a pathway to design a highly reliable Mg/Na hybrid battery.

中文翻译：

使用分级硒化铁结构作为阴极材料和改性双离子乙醚盐作为电解质设计镁/钠混合电池

我们开发了一种镁/钠（Mg/Na）混合电池，使用分级盘晶须FeSe ₂结构（HD-FeSe ₂ ）作为阴极材料和改进的双离子电解质。可极化的Se ^2–阴离子降低了Mg ²⁺迁移势垒，并且3D构型具有较大的表面积，有利于Mg ²⁺ /Na ⁺阳离子扩散和电子传输。乙醚中的双离子盐与 NaTFSI 降低了对称电池中的 Mg 电镀/剥离过电压。该混合电池在0.2 A g ^–1下的能量密度为260.9 Wh kg ^–1 ，功率密度为600.8 W kg ^–1 。 800次长循环后，在1.0 A g ^–1下，其容量保持率为154 mAh g ^–1 ，库仑效率超过99.5%。该电池还表现出出色的耐温能力。 3D 结构作为阴极材料和混合电解质的发现为设计高度可靠的镁/钠混合电池提供了一条途径。

更新日期：2024-04-03

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