Rechargeable magnesium and calcium metal batteries (RMBs and RCBs) are promising alternatives to lithium-ion batteries because of the high crustal abundance and capacity of magnesium and calcium. Yet, they are plagued by sluggish kinetics and parasitic reactions. We found a family of methoxyethyl-amine chelants that greatly promote interfacial charge transfer kinetics and suppress side reactions on both the cathode and metal anode through solvation sheath reorganization, thus enabling stable and highly reversible cycling of the RMB and RCB full cells with energy densities of 412 and 471 watt-hours per kilogram, respectively. This work provides a versatile electrolyte design strategy for divalent metal batteries.

中文翻译：

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溶剂化鞘重组使二价金属电池具有快速的界面电荷转移动力学

由于镁和钙的高地壳丰度和容量，可充电镁和钙金属电池（RMB 和 RCB）是锂离子电池的有前途的替代品。然而，它们受到缓慢的动力学和寄生反应的困扰。我们发现了一系列甲氧基乙胺螯合剂，它们通过溶剂化鞘重组极大地促进界面电荷转移动力学并抑制阴极和金属阳极上的副反应，从而实现能量密度为分别为每公斤 412 和 471 瓦时。这项工作为二价金属电池提供了一种通用的电解质设计策略。