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Title: Emergent solvation phenomena in non-aqueous electrolytes with multiple anions

Journal Article · · Chem

As the search for new battery chemistries with higher capacities and more stable supply chains expands, requiring increasingly complex electrolytes with multiple solvents and anions, it is becoming clear that understanding and controlling the working cation solvation structure is key to enabling improved stability and reversibility. In this work, we discover an emergent solvation behavior in multivalent electrolytes containing multiple anions, where bis(trifluoromethane sulfonyl) imide (TFSI⁻) anions that are fully dissociated in isolation form contact ion pairs with Zn2+ when combined with more strongly coordinating halides. This coordination modifies the electrochemical response, activating additional redox species as the halide association strength weakens (i.e., Cl⁻ > Br⁻ > I⁻) and systematically lowering overpotentials for metal deposition. This work suggests a completely new framework for electrolyte design in which anion chemistry can be used to tune both the bulk speciation and the interfacial solvation structure, enabling profound changes to the electrochemical behavior of the system.

Research Organization:
Argonne National Laboratory (ANL), Argonne, IL (United States). Joint Center for Energy Storage Research (JCESR)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES)
Grant/Contract Number:
AC02-06CH11357
OSTI ID:
2007636
Journal Information:
Chem, Journal Name: Chem Journal Issue: 7 Vol. 9; ISSN 2451-9294
Publisher:
Cell PressCopyright Statement
Country of Publication:
United States
Language:
English

References (47)

Fervent Hype behind Magnesium Batteries: An Open Call to Synthetic Chemists-Electrolytes and Cathodes Needed journal August 2017
Identifying the Critical Anion–Cation Coordination to Regulate the Electric Double Layer for an Efficient Lithium‐Metal Anode Interface journal January 2021
Spectroscopic characterization of the conformational states of the bis(trifluoromethanesulfonyl)imide anion (TFSI−) journal January 2005
Lithium solvation and diffusion in the 1-butyl-3-methylimidazolium bis(trifluoromethanesulfonyl)imide ionic liquid journal January 2008
Calculation of solvation free energies of Li+ and O2 − ions and neutral lithium–oxygen compounds in acetonitrile using mixed cluster/continuum models journal July 2012
An XAS study of speciation and thermodynamic properties of aqueous zinc bromide complexes at 25–150°C journal March 2012
Zinc complexation in chloride-rich hydrothermal fluids (25–600 °C): A thermodynamic model derived from ab initio molecular dynamics journal February 2015
Scientific Challenges for the Implementation of Zn-Ion Batteries journal April 2020
Achievements, Challenges, and Prospects of Calcium Batteries journal October 2019
Quantifying Species Populations in Multivalent Borohydride Electrolytes journal April 2021
Determination of Mg 2+ Speciation in a TFSI -Based Ionic Liquid With and Without Chelating Ethers Using Raman Spectroscopy journal June 2015
Solvation Structure of Zn 2+ and Cu 2+ Ions in Acetonitrile: A Combined EXAFS and XANES Study journal February 2015
Factors Influencing Preferential Anion Interactions during Solvation of Multivalent Cations in Ethereal Solvents journal March 2021
Mapping the Challenges of Magnesium Battery journal April 2016
Anion Association Strength as a Unifying Descriptor for the Reversibility of Divalent Metal Deposition in Nonaqueous Electrolytes journal July 2020
Water or Anion? Uncovering the Zn 2+ Solvation Environment in Mixed Zn(TFSI) 2 and LiTFSI Water-in-Salt Electrolytes journal September 2021
Tuning the Solvation Structure in Aqueous Zinc Batteries to Maximize Zn-Ion Intercalation and Optimize Dendrite-Free Zinc Plating journal January 2022
A Heterogeneous Oxide Enables Reversible Calcium Electrodeposition for a Calcium Battery journal August 2022
Reversible Calcium Plating and Stripping at Room Temperature Using a Borate Salt journal August 2019
Computational Thermochemistry: Scale Factor Databases and Scale Factors for Vibrational Frequencies Obtained from Electronic Model Chemistries journal August 2010
Ab Initio Calculation of Vibrational Absorption and Circular Dichroism Spectra Using Density Functional Force Fields journal November 1994
Halogenated Zn2+ Solvation Structure for Reversible Zn Metal Batteries journal September 2022
The Coupling between Stability and Ion Pair Formation in Magnesium Electrolytes from First-Principles Quantum Mechanics and Classical Molecular Dynamics journal February 2015
Magnitude and Directionality of Interaction in Ion Pairs of Ionic Liquids:  Relationship with Ionic Conductivity journal September 2005
Transport Coefficients, Raman Spectroscopy, and Computer Simulation of Lithium Salt Solutions in an Ionic Liquid journal February 2008
Universal Solvation Model Based on Solute Electron Density and on a Continuum Model of the Solvent Defined by the Bulk Dielectric Constant and Atomic Surface Tensions
  • Marenich, Aleksandr V.; Cramer, Christopher J.; Truhlar, Donald G.
  • The Journal of Physical Chemistry B, Vol. 113, Issue 18, p. 6378-6396 https://doi.org/10.1021/jp810292n
journal May 2009
Near-Quantitative Agreement of Model-Free DFT-MD Predictions with XAFS Observations of the Hydration Structure of Highly Charged Transition-Metal Ions journal September 2012
Pursuit of reversible Zn electrochemistry: a time-honored challenge towards low-cost and green energy storage journal January 2020
High-power Mg batteries enabled by heterogeneous enolization redox chemistry and weakly coordinating electrolytes journal November 2020
Highly reversible zinc metal anode for aqueous batteries journal April 2018
Novel, electrolyte solutions comprising fully inorganic salts with high anodic stability for rechargeable magnesium batteries journal January 2014
Bisalt ether electrolytes: a pathway towards lithium metal batteries with Ni-rich cathodes journal January 2019
Tailoring desolvation kinetics enables stable zinc metal anodes journal January 2020
Balanced basis sets of split valence, triple zeta valence and quadruple zeta valence quality for H to Rn: Design and assessment of accuracy journal January 2005
Accurate Coulomb-fitting basis sets for H to Rn journal January 2006
Long-range corrected hybrid density functionals with damped atom–atom dispersion corrections journal January 2008
High resolution x‐ray absorption spectroscopy with absolute energy calibration for the determination of absorption edge energies journal March 1996
Continuous surface charge polarizable continuum models of solvation. I. General formalism journal March 2010
Energy storage emerging: A perspective from the Joint Center for Energy Storage Research journal June 2020
Scattering-matrix formulation of curved-wave multiple-scattering theory: Application to x-ray-absorption fine structure journal April 1990
Multiple-scattering calculations of x-ray-absorption spectra journal July 1995
ATHENA , ARTEMIS , HEPHAESTUS : data analysis for X-ray absorption spectroscopy using IFEFFIT journal June 2005
"Water-in-salt" electrolyte enables high-voltage aqueous lithium-ion chemistries journal November 2015
Solvation sheath reorganization enables divalent metal batteries with fast interfacial charge transfer kinetics journal October 2021
X‐Ray Absorption Studies of ZnCl2‐PEO and Mixed Salt ZnCl2/KCl‐PEO and ZnCl2/CsCl‐PEO Complexes journal October 1996
Solvation Structure and Electrochemical Properties of a New Weakly Coordinating Aluminate Salt as a Nonaqueous Electrolyte for Zinc Batteries journal December 2020
Deriving formation constants for aqueous metal complexes from XANES spectra: Zn2+ and Fe2+ chloride complexes in hypersaline solutions journal May 2007