New Class of 3.7 V Fe-Based Positive Electrode Materials for Na-Ion Battery Based on Cation-Disordered Polyanion Framework,Chemistry of Materials

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New Class of 3.7 V Fe-Based Positive Electrode Materials for Na-Ion Battery Based on Cation-Disordered Polyanion Framework
Chemistry of Materials ( IF 7.2 ) Pub Date : 2018-08-31 00:00:00 , DOI: 10.1021/acs.chemmater.8b02354
Minkyu Kim ₁ , Donghoon Kim ₁ , Wontae Lee ₁ , Hyun Myung Jang ₁ , Byoungwoo Kang ₁

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We report a new triplite-type iron fluoro-sulfate compound, a cation-disordered NaFeSO₄F that has redox potential of ∼3.7 V versus Na⁺/Na⁰ and can have 138 mA·h/g of theoretical capacity. This compound shows practical energy density (∼430 W·h/kg) comparable to that of several Li-ion battery positive electrode materials such as LiMn₂O₄ (430 W·h/kg). Therefore, triplite NaFeSO₄F is a candidate positive electrode material which can meet the requirements for high energy density Na-ion batteries. Furthermore, this study contributes to expanding the spectrum of Na electrode materials to cation-disordered polyanion compounds and opens up new opportunities for the design of electrode materials for advanced Na-ion batteries.

中文翻译：

基于阳离子无序聚阴离子骨架的新型3.7 V铁基钠离子电池正极材料

我们报道了一种新的三重铁型氟代硫酸铁化合物，一种阳离子无序的NaFeSO ₄ F，相对于Na ⁺ / Na ^0而言，氧化还原电势约为3.7 V ，理论容量为138 mA·h / g。该化合物的实际能量密度（约430 W·h / kg）与几种锂离子电池正极材料（例如LiMn ₂ O ₄）的能量密度（430 W·h / kg）相当。因此，三层NaFeSO ₄F是可以满足高能量密度Na离子电池要求的候选正极材料。此外，这项研究有助于将Na电极材料的光谱扩展到阳离子无序的聚阴离子化合物，并为高级Na离子电池的电极材料设计开辟了新的机会。

更新日期：2018-08-31

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