Insights into Spontaneous Solid Electrolyte Interphase Formation at Magnesium Metal Anode Surface from Ab Initio Molecular Dynamics SimulationsClick to copy article linkArticle link copied!
- Garvit Agarwal*Garvit Agarwal*Email: [email protected]Materials Science Division, Argonne National Laboratory, Lemont, Illinois 60439, United StatesJoint Center for Energy Storage Research (JCESR), Argonne National Laboratory, Lemont, Illinois 60439, United StatesMore by Garvit Agarwal
- Jason D. HowardJason D. HowardMaterials Science Division, Argonne National Laboratory, Lemont, Illinois 60439, United StatesJoint Center for Energy Storage Research (JCESR), Argonne National Laboratory, Lemont, Illinois 60439, United StatesMore by Jason D. Howard
- Venkateshkumar PrabhakaranVenkateshkumar PrabhakaranJoint Center for Energy Storage Research (JCESR), Argonne National Laboratory, Lemont, Illinois 60439, United StatesPacific Northwest National Laboratory, Richland, Washington 99352, United StatesMore by Venkateshkumar Prabhakaran
- Grant E. JohnsonGrant E. JohnsonJoint Center for Energy Storage Research (JCESR), Argonne National Laboratory, Lemont, Illinois 60439, United StatesPacific Northwest National Laboratory, Richland, Washington 99352, United StatesMore by Grant E. Johnson
- Vijayakumar MurugesanVijayakumar MurugesanJoint Center for Energy Storage Research (JCESR), Argonne National Laboratory, Lemont, Illinois 60439, United StatesPacific Northwest National Laboratory, Richland, Washington 99352, United StatesMore by Vijayakumar Murugesan
- Karl T. MuellerKarl T. MuellerJoint Center for Energy Storage Research (JCESR), Argonne National Laboratory, Lemont, Illinois 60439, United StatesPacific Northwest National Laboratory, Richland, Washington 99352, United StatesMore by Karl T. Mueller
- Larry A. CurtissLarry A. CurtissMaterials Science Division, Argonne National Laboratory, Lemont, Illinois 60439, United StatesJoint Center for Energy Storage Research (JCESR), Argonne National Laboratory, Lemont, Illinois 60439, United StatesMore by Larry A. Curtiss
- Rajeev S. Assary*Rajeev S. Assary*Email: [email protected]. Phone: 630-252-3536.Materials Science Division, Argonne National Laboratory, Lemont, Illinois 60439, United StatesJoint Center for Energy Storage Research (JCESR), Argonne National Laboratory, Lemont, Illinois 60439, United StatesMore by Rajeev S. Assary
Abstract

Spontaneous chemical reactivity at multivalent (Mg, Ca, Zn, Al) electrode surfaces is critical to solid electrolyte interphase (SEI) formation, and hence, directly affects the longevity of batteries. Here, we report an investigation of the reactivity of 0.5 M Mg(TFSI)2 in 1,2-dimethoxyethane (DME) solvent at a Mg(0001) surface using ab initio molecular dynamics (AIMD) simulations and detailed Bader charge analysis. Based on the simulations, the initial degradation reactions of the electrolyte strongly depend on the structure of the Mg(TFSI)2 species near the anode surface. At the surface, the dissociation of Mg(TFSI)2 species occurs via cleavage of the N–S bond for the solvent separated ion pair (SSIP) and via cleavage of the C–S bond for the contact ion pair (CIP) configuration. In the case of the CIP, both TFSI anions undergo spontaneous bond dissociation reactions to form atomic O, C, S, F, and N species adsorbed on the surface of the Mg anode. These products indicate that the initial SEI layer formed on the surface of the pristine Mg anode consists of a complex mixture of multiple components such as oxides, carbides, sulfides, fluorides, and nitrides. We believe that the atomic-level insights gained from these simulations will lay the groundwork for the rational design of tailored and functional interphases that are critical for the success of multivalent battery technology.
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