Gregorio F. Ortiz, Ruqin Ma, Mingzeng Luo, Li Yixiao, He Zhanning, Yu Su, Jiale Huang, Yong Yang, Zhanhua Wei
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引用次数: 0
摘要
用一种简单的方法合成了具有准六边形堆积粒子的三角形硼钛矿（Na0.5MnO2·0.7H2O）。MnO6层被钠离子和水分子扩展（约7.1 Å，经HRTEM证实），允许阴极的循环性高达4.4 V，没有阴离子氧化还原效应。这种特殊的相具有181.2 mA h g−1可逆容量，高库仑效率（99.8%），良好的倍率性能（20-640 mA g−1），200次循环容量保持率为80%的钠存储性能。Mn-k边缘的x射线吸附近边结构（XANES）谱证实了主要氧化还原成分为Mn3+/Mn4+。一个环保的钠离子电池由这种阴极和生物废物衍生的碳（从柠檬皮的垃圾中获得）阳极组装而成，并提供约330 Wh kg - 1的能量密度（在材料水平上），在200次循环中保持在约71%。锰、钠、碳是工业上急需的廉价且环保的实用储能材料。
An eco-friendly Na-ion battery utilizing biowaste-derived carbon and birnessite with enhanced high voltage reaction
Trigonal birnessite (Na0.5MnO2·0.7H2O) with quasi-hexagonal-stacked particles is synthesized by a simple procedure. The MnO6 layers are expanded (ca. 7.1 Å as confirmed by HRTEM) by sodium ion and water molecules permitting the cyclability of the cathode up to 4.4 V without anionic redox effect. This particular phase exhibits sodium storage performance with 181.2 mA h g−1 reversible capacity, high Coulombic efficiency (99.8%), good rate performance (20–640 mA g−1), and 80% capacity retention over 200 cycles. X-ray adsorption near-edge structure (XANES) spectra at Mn-k edge confirmed that the main redox component is Mn3+/Mn4+. An environmental-friendly Na-ion full cell is assembled with this cathode and biowaste-derived carbon (obtained from trash of lemon peels) anode and provided ∼ 330 Wh kg−1 energy density (at the material's level) which is preserved at ∼71% over 200 cycles. Manganese, sodium, and carbon are cheap and eco-friendly materials for practical energy storage eagerly sought after in the industry.
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