A rechargeable Mg battery where the capacity mainly originates from reversible reactions occurring at the electrode/electrolyte interface efficiently avoids the challenge of sluggish Mg intercalation encountered in conventional Mg batteries. The interfacial reactions in a cell based on microwave-exfoliated graphite oxide (MEGO) as the cathode and all phenyl complex (APC) as electrolyte are identified by quantitative kinetics analysis as a combination of diffusion-controlled reactions involving ether solvents (esols) and capacitive processes. During magnesiation, esols in APC electrolytes can significantly affect the electrochemical reactions and charge transfer resistances at the electrode/electrolyte interface and thus govern the charge storage properties of the MEGO cathode. In APC–tetrahydrofuran (THF) electrolyte, MEGO exhibits a reversible capacity of ∼220 mAh g^–1 at 10 mA g^–1, while a reversible capacity of ∼750 mAh g^–1 at 10 mA g^–1 was obtained in APC-1,2-dimethoxyethane (DME) electrolyte. The high capacity improvement not only points to the important role of the esols in the APC electrolytes but also presents a Mg battery with high interfacial charge storage capability as a very promising and viable competitor to the conventional intercalation-based batteries.

中文翻译：

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镁电池用碳质阴极的高界面电荷存储能力

容量主要源自电极/电解质界面处发生的可逆反应的可再充电镁电池有效地避免了常规镁电池遇到的缓慢插入镁的挑战。通过定量动力学分析，将扩散控制反应（涉及醚溶剂（esol s）和溶剂）和电容性过程。在放大时，esolAPC电解质中的离子可显着影响电极/电解质界面的电化学反应和电荷转移电阻，从而控制MEGO阴极的电荷存储性能。在APC -四氢呋喃（THF）电解质，表现出MEGO毫安~220 g的可逆容量^-1以10mA克^-1，而~750毫安g的可逆容量^-1以10mA克^-1在APC-得到1,2-二甲氧基乙烷（DME）电解质。高容量的提高不仅指出了esol s在APC电解质中的重要作用，而且还提出了一种具有高界面电荷存储能力的Mg电池，它是传统插层式电池的非常有前途和可行的竞争者。