Monovalent manganese based anodes and co-solvent electrolyte for stable low-cost high-rate sodium-ion batteries.
Monovalent manganese based anodes and co-solvent electrolyte for stable low-cost high-rate sodium-ion batteries.
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DOI：
10.1038/s41467-018-03257-1
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发表时间：
2018-02-28
影响因子：
16.6
通讯作者：
Wessells CD
中科院分区：
文献类型：
--
作者：
Firouzi A;Qiao R;Motallebi S;Valencia CW;Israel HS;Fujimoto M;Wray LA;Chuang YD;Yang W;Wessells CD
可持续电力供应的需求需要高性能、高性价比的储能技术。在这里，我们报告了一个高倍率，长寿命，低成本的钠离子电池全电池系统，通过创新的阳极和电解质。普鲁士蓝类似物中锰的氧化还原对（I/II）能够实现高速率和稳定的阳极。软X射线吸收光谱和共振非弹性X射线散射提供了直接的证据，表明在充电阳极中存在一价锰。氰基配体与锰-3d态之间存在较强的杂化作用，有利于提高其电子性质，提高其速率性能。此外，我们采用有机-水性共溶剂电解质来解决普鲁士蓝类似物长期存在的溶解度问题。在两个电极和共溶剂电解质中具有低成本普鲁士蓝类似物的全电池钠离子电池在1C和95%放电深度下1000次循环后保持其初始放电容量的95%。揭示的锰（I/II）氧化还原对激发了基于非典型氧化态的电池的概念创新。钠离子电池提供比锂更经济的存储，可用于电网规模的能量存储。在这里，作者展示了基于MnHCMn阳极和有机-水性共溶剂电解质的全电池。X射线光谱学证据进一步表明Mn（I）的存在。
The demand of sustainable power supply requires high-performance cost-effective energy storage technologies. Here we report a high-rate long-life low-cost sodium-ion battery full-cell system by innovating both the anode and the electrolyte. The redox couple of manganese(I/II) in Prussian blue analogs enables a high-rate and stable anode. Soft X-ray absorption spectroscopy and resonant inelastic X-ray scattering provide direct evidence suggesting the existence of monovalent manganese in the charged anode. There is a strong hybridization between cyano ligands and manganese-3d states, which benefits the electronic property for improving rate performance. Additionally, we employ an organic–aqueous cosolvent electrolyte to solve the long-standing solubility issue of Prussian blue analogs. A full-cell sodium-ion battery with low-cost Prussian blue analogs in both electrodes and co-solvent electrolyte retains 95% of its initial discharge capacity after 1000 cycles at 1C and 95% depth of discharge. The revealed manganese(I/II) redox couple inspires conceptual innovations of batteries based on atypical oxidation states. Sodium ion batteries offer more cost-effective storage than lithium and could be used for grid-scale energy storage. Here, the authors demonstrate a full cell based on a MnHCMn anode and an organic-aqueous cosolvent electrolyte. X-ray spectroscopy evidence further suggests the presence of Mn(I).
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