Toward Highly Reversible Magnesium–Sulfur Batteries with Efficient and Practical Mg[B(hfip)4]2 Electrolyte,ACS Energy Letters

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Toward Highly Reversible Magnesium–Sulfur Batteries with Efficient and Practical Mg[B(hfip)4]2 Electrolyte
ACS Energy Letters ( IF 19.3 ) Pub Date : 2018-07-25 00:00:00 , DOI: 10.1021/acsenergylett.8b01061
Zhirong Zhao-Karger ₁ , Runyu Liu ₂ , Wenxu Dai ₂ , Zhenyou Li ₁ , Thomas Diemant ₃ , B. P. Vinayan ₁ , Christian Bonatto Minella ₁ , Xingwen Yu ₄ , Arumugam Manthiram ₄ , R. Jürgen Behm _{1,

3} , Mario Ruben _{2,

5} , Maximilian Fichtner _{1,

2}

Affiliation

The rechargeable magnesium (Mg) battery has been considered a promising candidate for future battery generations due to unique advantages of the Mg metal anode. The combination of Mg with a sulfur cathode is one of the attractive electrochemical energy storage systems that use safe, low-cost, and sustainable materials and could potentially provide a high energy density. To develop a suitable electrolyte remains the key challenge for realization of a magnesium sulfur (Mg–S) battery. Herein, we demonstrate that magnesium tetrakis(hexafluoroisopropyloxy) borate Mg[B(hfip)₄]₂ (hfip = OC(H)(CF₃)₂) satisfies a multitude of requirements for an efficient and practical electrolyte, including high anodic stability (>4.5 V), high ionic conductivity (∼11 mS cm^–1), and excellent long-term Mg cycling stability with a low polarization. Insightful mechanistic studies verify the reversible redox processes of Mg–S chemistry by utilizing Mg[B(hfip)₄]₂ electroylte and also unveil the origin of the voltage hysteresis in Mg–S batteries.

中文翻译：

迈向高效，实用的Mg [B（hfip）₄ ] ₂电解质的高可逆镁硫电池

由于镁金属阳极的独特优势，可再充电镁（Mg）电池被认为是未来电池的有前途的候选者。Mg与硫阴极的结合是使用安全，低成本和可持续材料的有吸引力的电化学储能系统之一，并可能提供高能量密度。开发合适的电解质仍然是实现镁硫（Mg–S）电池的关键挑战。在此，我们证明四（六氟异丙氧基）硼酸镁Mg [B（hfip）₄ ] ₂（hfip = OC（H）（CF ₃）₂）满足了高效实用电解液的多种要求，包括高阳极稳定性（> 4.5 V），高离子电导率（〜11 mS cm ^–1）和出色的长期Mg循环稳定性以及低极化性。深入的机理研究通过利用Mg [B（hfip）₄ ] ₂电解质验证了Mg-S化学的可逆氧化还原过程，并且揭示了Mg-S电池电压滞后的起因。

更新日期：2018-07-25

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