Water-mediated cation intercalation of open-framework indium hexacyanoferrate with high voltage and fast kinetics.
Water-mediated cation intercalation of open-framework indium hexacyanoferrate with high voltage and fast kinetics.
复制标题
高电压和快动力学的水介导开放框架六氰基铁酸铟的阳离子插层
DOI：
10.1038/ncomms11982
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发表时间：
2016-06-20
影响因子：
16.6
通讯作者：
Liu Z
中科院分区：
文献类型：
--
作者：
Chen L;Shao H;Zhou X;Liu G;Jiang J;Liu Z
由不易燃和低成本材料制成的可充电水性金属离子电池在大型公用电网应用中提供了有前途的机会，但低电压和能量输出以及有限的循环寿命仍然是其电化学操作的关键缺点。在此，我们开发了一系列基于“M+/N+-双梭”的高压水溶液金属离子电池来克服这些缺点。它们分别以六氰合铁酸铟为阴极材料，以TiP 2 O 7和NaTi 2（PO 4）3为阳极材料。它们作为超级电容器都具有很强的倍率性能。通过多种表征技术结合从头计算，揭示了六氰合铁酸铟的水介导阳离子插层行为。水被认为是与Li+或Na+共嵌入，这明显地提高了嵌入电压并降低了扩散动力学。对于K+，由于通道空间的限制，水不参与插层。
Rechargeable aqueous metal-ion batteries made from non-flammable and low-cost materials offer promising opportunities in large-scale utility grid applications, yet low voltage and energy output, as well as limited cycle life remain critical drawbacks in their electrochemical operation. Here we develop a series of high-voltage aqueous metal-ion batteries based on ‘M+/N+-dual shuttles’ to overcome these drawbacks. They utilize open-framework indium hexacyanoferrates as cathode materials, and TiP2O7and NaTi2(PO4)3as anode materials, respectively. All of them possess strong rate capability as ultra-capacitors. Through multiple characterization techniques combined withab initiocalculations, water-mediated cation intercalation of indium hexacyanoferrate is unveiled. Water is supposed to be co-inserted with Li+or Na+, which evidently raises the intercalation voltage and reduces diffusion kinetics. As for K+, water is not involved in the intercalation because of the channel space limitation.