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A materials perspective on magnesium-ion-based solid-state electrolytes
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DOI：10.1039/c9ta11729f.png)
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Abstract
En 中文
As economically viable alternatives to lithium-ion batteries, magnesium-ion-based all-solid-state batteries have been researched to meet the criteria for an ideal energy storage device. With an energy-dense magnesium-metal anode, such batteries can provide almost double the volumetric energy density at half the cost when compared with that obtainable from the state-of-the-art lithium-ion batteries. Although the development of solid-state magnesium-based batteries is hindered by various factors, the identification of an appropriate electrolyte remains the most challenging and limiting factor. In this review, we provide a survey of inorganic ceramic, metal-organic framework, glass, and organic solid polymer electrolytes that have been developed till date. We discuss the relationship between the structure, composition, and ionic conductivity of these inorganic Mg2+-ion solid-state electrolytes as well as the fundamental Mg-ion conduction mechanisms that govern magnesium transport in these solids, emphasizing on Mg2+-ion-conducting inorganic materials. By a comparison of Mg2+- and Na+-ion conductors under the theoretical framework of multi-excitation entropy (or Meyer-Neldel rules), we highlight the possible differences between these two systems, which can yield substantially different ion transport characteristics.
Keywords:
GEL POLYMER ELECTROLYTES
METAL-ORGANIC FRAMEWORKS
MEYER-NELDEL RULE
LITHIUM-ION
POLY(ETHYLENE OXIDE)
ELECTROCHEMICAL PERFORMANCE
REVERSIBLE MAGNESIUM
CATHODE MATERIALS
CRYSTAL-STRUCTURE
BORATE ESTER
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