Fast kinetics of multivalent intercalation chemistry enabled by solvated magnesium-ions into self-established metallic layered materials

Zhenyou Li (), Xiaoke Mu, Zhirong Zhao-Karger (), Thomas Diemant, R. Jürgen Behm, Christian Kübel and Maximilian Fichtner
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Zhenyou Li: Helmholtz Institute Ulm (HIU)
Xiaoke Mu: Karlsruhe Institute of Technology (KIT)
Zhirong Zhao-Karger: Helmholtz Institute Ulm (HIU)
Thomas Diemant: Ulm University
R. Jürgen Behm: Helmholtz Institute Ulm (HIU)
Christian Kübel: Helmholtz Institute Ulm (HIU)
Maximilian Fichtner: Helmholtz Institute Ulm (HIU)

Nature Communications, 2018, vol. 9, issue 1, 1-13

Abstract: Abstract Rechargeable magnesium batteries are one of the most promising candidates for next-generation battery technologies. Despite recent significant progress in the development of efficient electrolytes, an on-going challenge for realization of rechargeable magnesium batteries remains to overcome the sluggish kinetics caused by the strong interaction between double charged magnesium-ions and the intercalation host. Herein, we report that a magnesium battery chemistry with fast intercalation kinetics in the layered molybdenum disulfide structures can be enabled by using solvated magnesium-ions ([Mg(DME)x]2+). Our study demonstrates that the high charge density of magnesium-ion may be mitigated through dimethoxyethane solvation, which avoids the sluggish desolvation process at the cathode-electrolyte interfaces and reduces the trapping force of the cathode lattice to the cations, facilitating magnesium-ion diffusion. The concept of using solvation effect could be a general and effective route to tackle the sluggish intercalation kinetics of magnesium-ions, which can potentially be extended to other host structures.

Date: 2018
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DOI: 10.1038/s41467-018-07484-4

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