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Title: A weakly ion pairing electrolyte designed for high voltage magnesium batteries

Journal Article · · Energy & Environmental Science
DOI:https://doi.org/10.1039/d3ee02861e· OSTI ID:2281694
ORCiD logo [1];  [2];  [1];  [3]; ORCiD logo [1]
  1. Department of Chemistry and the Waterloo Institute for Nanotechnology, University of Waterloo, Ontario N2L 3G1, Canada;Joint Center for Energy Storage Research, Argonne National Laboratory, Lemont, Illinois 60439, USA
  2. Materials Science Division, Lawrence Berkeley National Laboratory, Berkeley, California 94720, USA
  3. Joint Center for Energy Storage Research, Argonne National Laboratory, Lemont, Illinois 60439, USA;Molecular Foundry, Lawrence Berkeley National Laboratory, 1 Cyclotron Road, Berkeley, California 94720, USA;Department of Materials Science and Engineering, UC Berkeley, Berkeley, California 94720, USA

High-voltage rechargeable magnesium batteries (RMBs) are potential alternatives to lithium-ion batteries owing to the low cost and high abundance of magnesium. However, the parasitic reactions of the latter with many electrolytes greatly hinders the stability and kinetics of Mg plating/stripping. Here we report a new and easily accessible solvent-designed electrolyte, which effectively solves the difficulty of ion pair dissociation and facilitates fast nanoscale Mg nucleation/growth using simple Mg(TFSI)2 as the salt, enabling a facile interfacial charge transfer process. Dendrite-free Mg plating/stripping is maintained for over 7000 hours (∼10 months) at a practical areal capacity of 2 mA h cm−2. The high-voltage stability of these electrolytes is demonstrated by benchmarking with polyaniline||Mg full cells with an operating voltage up to 3.5 V that exhibit stable cycling at a 2C rate with 99% coulombic efficiency after 400 cycles. This work opens up new frontiers in coupling low-cost electrolytes with next-generation high-voltage cathode materials for fast-charging RMBs with long life and high energy densities.

Research Organization:
Argonne National Laboratory (ANL), Argonne, IL (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES)
DOE Contract Number:
Joint Center for Energy Storage Research
OSTI ID:
2281694
Journal Information:
Energy & Environmental Science, Vol. 17, Issue 1; ISSN 1754-5692
Country of Publication:
United States
Language:
English

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