4.8 Article

Tailoring Coordination in Conventional Ether-Based Electrolytes for Reversible Magnesium-Metal Anodes

期刊

出版社

WILEY-V C H VERLAG GMBH
DOI: 10.1002/anie.202205187

关键词

Conventional Electrolytes; Mg-Metal Batteries; Organophosphorus Additives; Solid-Electrolyte Interphase; Solvation Sheath Rearrangement

资金

  1. National Natural Science Foundation of China [22178217]
  2. Open Project of State Key Laboratory of Functional Materials for Informatics [SKL202107]
  3. Key Technologies Research and Development Program [2021YFA1101300]

向作者/读者索取更多资源

By tracking the Mg2+ solvation sheath, this study identifies the components that lead to the formation of the passivation layer and proposes a method to modify the solvation coordination. By introducing an additive solvent with extreme electron richness, the solvation sheath is softened, resulting in improved Mg2+ transport and reduced electrical resistance on the Mg metal anode. This leads to excellent cycling performance.
Rechargeable magnesium (Mg) batteries based on conventional electrolytes are seriously plagued by the formation of the ion-blocking passivation layer on the Mg metal anode. By tracking the Mg2+ solvation sheath, this work links the passivation components to the Mg2+-solvents (1,2-dimethoxyethane, DME) coordination and the consequent thermodynamically unstable DME molecules. On this basis, we propose a methodology to tailor solvation coordination by introducing the additive solvent with extreme electron richness. Oxygen atoms in phosphorus-oxygen groups compete with that in carbon-oxygen groups of DME for the coordination with Mg2+, thus softening the solvation sheath deformation. Meanwhile, the organophosphorus molecules in the rearranged solvation sheath decompose on the Mg surface, increasing the Mg2+ transport and electrical resistance by three and one orders of magnitude, respectively. Consequently, the symmetric cells exhibit superior cycling performance of over 600 cycles with low polarization.

作者

我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。

评论

主要评分

4.8
评分不足

次要评分

新颖性
-
重要性
-
科学严谨性
-
评价这篇论文

推荐

暂无数据
暂无数据