Simultaneous Stabilization of Potassium Metal and Superoxide in K–O2 Batteries on the Basis of Electrolyte Reactivity,Angewandte Chemie International Edition

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Simultaneous Stabilization of Potassium Metal and Superoxide in K–O2 Batteries on the Basis of Electrolyte Reactivity
Angewandte Chemie International Edition ( IF 16.1 ) Pub Date : 2018-06-19 , DOI: 10.1002/anie.201804115
Neng Xiao ₁ , Gerald Gourdin ₁ , Yiying Wu ₁

Affiliation

In superoxide batteries based on O₂/O₂⁻ redox chemistry, identifying an electrolyte to stabilize both the alkali metal and its superoxide remains challenging owing to their reactivity towards the electrolyte components. Bis(fluorosulfonyl)imide (FSI⁻) has been recognized as a “magic anion” for passivating alkali metals. The KFSI–dimethoxyethane electrolyte passivates the potassium metal anode by cleavage of S−F bonds and the formation of a KF‐rich solid–electrolyte interphase (SEI). However, the KFSI salt is chemically unstable owing to nucleophilic attack by superoxide and/or hydroxide species. On the other hand, potassium bis(trifluorosulfonyl)imide (KTFSI) is stable to KO₂, but results in mossy potassium deposits and irreversible plating and stripping. To circumvent this dilemma, we developed an artificial SEI for the metal anode and thus long‐cycle‐life K–O₂ batteries. This study will guide the development of stable electrolytes and artificial SEIs for metal–O₂ batteries.

中文翻译：

基于电解质反应性的同时稳定K–O2电池中的钾金属和超氧化物

在超氧电池基于Ò ₂ / O ₂^-氧化还原化学，识别的电解质，以稳定碱金属和其超遗体由于它们的朝向电解质成分的反应性挑战两者。双（氟磺酰）亚胺（FSI ^-）已被识别为“魔阴离子”钝化碱金属。KFSI-二甲氧基乙烷电解质通过裂解SF键和形成富KF的固体-电解质中间相（SEI）来钝化钾金属阳极。然而，由于超氧化物和/或氢氧化物种类的亲核攻击，KFSI盐在化学上是不稳定的。另一方面，双（三氟磺酰基）酰亚胺钾（KTFSI）对KO ₂稳定，但会导致生苔的钾沉积物以及不可逆的镀覆和剥离。为了避免这一难题，我们为金属阳极开发了人工SEI，从而开发了使用寿命长的K-O ₂电池。这项研究将指导开发用于金属O ₂电池的稳定电解质和人造SEI 。

更新日期：2018-06-19

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