Journal
ACS ENERGY LETTERS
Volume 6, Issue 9, Pages 3212-3220Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsenergylett.1c01411
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Funding
- National Natural Science Foundation of China [21975159, 2157316, U1705255]
- Shanghai Aerospace Science and Technology Innovation Fund [SAST2018-117]
- Shanghai Municipal Commission of Science and Technology [11JC140700]
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The study focuses on the development of electrolytes for magnesium batteries, and a Mg[B(Otfe)(4)](2) electrolyte was designed with excellent performance and cost reduction. The electrolyte prepared by two methods showed stable cycling of magnesium plating-stripping and excellent performance.
The requirement of practical high-performance electrolytes is a key bottleneck restricting the development of rechargeable magnesium batteries (RMBs). Electrolytes based on weakly coordinated and fluorinated bulky boron-center anions (B(ORF)(4)(-)) have attracted wide attention for their admirable oxidation stability, high ionic conductivity, and weak corrosion. However, the complex synthesis route and costly raw materials still hinder their wide application. Therefore, a magnesium tetra(trifluoroethanoloxy)borate (Mg[B(Otfe)(4)](2)) is designed not only to inherit these merits above but also greatly cut down the synthetic costs. The as-prepared electrolyte is synthesized by two methods of microcrystal redissolution and in situ reaction, both of them cycle stably for reversible Mg plating-stripping with an average Coulombic efficiency of similar to 99% and overpotentials as low as 0.2 V, as well as an oxidation stability of more than 3 V vs Mg at stainless steel. The design strategy of the electrolyte and its compatibility with insertion or replacement-type cathodes promote the realization of practical RMBs.
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