Exploiting cation aggregation in new magnesium amidohaloaluminate electrolytes for magnesium batteries
Exploiting cation aggregation in new magnesium amidohaloaluminate electrolytes for magnesium batteries
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利用新型氨基卤铝酸镁电解质中的阳离子聚集用于镁电池
DOI：
10.1039/c9qi01606f
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发表时间：
2020
影响因子：
7
通讯作者：
Brouillet E
中科院分区：
文献类型：
--
作者：
Brouillet E
镁电池是锂离子电池的一种有吸引力和可持续发展的替代品，其中金属镁作为负极显示出优异的理论体积能量密度，为3833A h L−1，而锂为2062A h L−1。实现其更广泛应用的一个突出的关键瓶颈是开发合适的电解液，其中电极钝化、有限的电化学窗口、调节要求、低离子迁移率和低库仑效率都导致了镁电池的电流限制。在一个由热力学稳定的[Mg_2Cl3]+双核阳离子主导的领域，我们提出了一种新的氨基卤铝酸镁电解液[(DIPP)(SiMe3)2NAlCl3]−[MgCl2x−1]+，其中通过取代镁离子中心的配位配体来定制氯化镁阳离子聚集(x=1，2，3)，并展示了如何直接改变这种阳离子对电池性能的影响(Dipp=2，6-二异丙基苯基，Me=甲基)。用循环伏安法、恒电流循环和阻抗谱等方法对这些新型电解液在金属镁对称电池和以Mo6S8为正极材料的电池中的电化学活性进行了评价。单核和双核的氨基卤铝酸镁电解液易于从金属镁阳极上进行可逆镀镁和剥离，具有极好的稳定性，可承受超过70小时的连续循环。我们证明了这些新型电解液与Mo6S8 Chevrel插层正极材料的兼容性，允许镁金属电池循环多达100次，库仑效率超过95%。
Mg batteries present an attractive and sustainable alternative to Li-ion batteries, wherein magnesium metal as an anode displays a superior theoretical volumetric energy density of 3833 A h L−1versus 2062 A h L−1 for lithium. An outstanding crucial bottleneck in realising their more widespread uptake is the development of suitable electrolytes, where electrode passivation, a limited electrochemical window, conditioning requirements, low ion mobility and low coulombic efficiencies all contribute to current limitations in Mg batteries. In an area thus far dominated by the thermodynamically stable [Mg2Cl3]+ dinuclear cation, we present here a novel family of magnesium amidohaloaluminate electrolytes [(Dipp)(SiMe3)2NAlCl3]− [MgxCl2x−1]+ where the magnesium chloride cation aggregation has been tailored (x = 1, 2, 3) by substitution of the coordinating ligand to the Mg2+ centre, and show how directly altering this cation affects battery performance (Dipp = 2,6-diisopropylphenyl, Me = methyl). The electrochemical activity of these new electrolytes has been evaluated by cyclic voltammetry, galvanostatic cycling and impedance spectroscopy in Mg–metal symmetrical cells as well as in battery cells with the Mo6S8 Chevrel phase cathode material against magnesium metal. The mononuclear and dinuclear magnesium amidohaloaluminate electrolytes facilitate reversible Mg plating and stripping from the Mg–metal anode with excellent stability, withstanding over 70 hours of continuous cycling. We demonstrate the compatibility of these novel electrolytes with the Mo6S8 Chevrel intercalation cathode material, allowing cycling of a Mg–metal cell up to 100 cycles with coulombic efficiencies above 95%.
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影响因子：
32.5
作者：
Canepa, Pieremanuele;Jayaraman, Saivenkataraman;Ceder, Gerbrand
通讯作者：
Ceder, Gerbrand
基于硼氢化镁的镁电解质中的离子对和扩散。
影响因子：
9.5
作者：
D. Samuel;Carl Steinhauser;Jeffrey G. Smith;A. Kaufman;M. Radin;Junichi Naruse;Hidehiko Hiramatsu;Donald J. Siegel
通讯作者：
Donald J. Siegel
访问高密度三足配体的低密度配位模式以完成其配位库。
影响因子：
4
作者：
T. Cadenbach;Eva Hevia;A. Kennedy;R. Mulvey;Janie;Stuart D. Robertson
通讯作者：
Stuart D. Robertson
DOI：
10.1039/c4cc07621d
发表时间：
2015-02-11
期刊：
Chemical communications (Cambridge, England)
影响因子：
--
作者：
Liu T;Cox JT;Hu D;Deng X;Hu J;Hu MY;Xiao J;Shao Y;Tang K;Liu J
通讯作者：
Liu J
影响因子：
8.6
作者：
Canepa, Pieremanuele;Gautam, Gopalakrishnan Sai;Ceder, Gerbrand
通讯作者：
Ceder, Gerbrand