期刊
ACS NANO
卷 12, 期 3, 页码 2998-3009出版社
AMER CHEMICAL SOC
DOI: 10.1021/acsnano.8b00753
关键词
Mg battery; microwave-exfoliated graphite oxide; diffusion-controlled reactions; ether solvents; capacitive processes
类别
资金
- Research Council of Norway through the project NanoMag [221785]
- Uninett Sigma2 [NN9264K]
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 similar to 220 mAh g(-1) at 10 mA g(-1), while a reversible capacity of similar to 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.
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