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Title: Accelerated design of vanadium redox flow battery electrolytes through tunable solvation chemistry

Journal Article · · Cell Reports Physical Science

Operational stability of electrolytes is a persistent impediment in building redox flow battery technology. Stabilizing multiple vanadium oxidation states in aqueous solution is a primary challenge in designing reliable large-scale vanadium redox flow batteries (VRBs). Here we demonstrate that rationally selected ionic additives can stabilize the aqua vanadium solvate structures through preferential bonding and molecular interactions despite their relatively low concentrations (≤0.1 M). The competing cations (NH4+ and Mg2+) and bonding anions (SO42–, PO43–, and Cl) introduced by bi-additives are used to tune the vanadium solvation chemistry and design an optimal electrolyte for VRB technology. Such molecular engineering of VRB electrolytes results in enhancement of the operational temperature window by 180% and energy density by more than 30% relative to traditional electrolytes. This work demonstrates that tunable solvation chemistry is a promising pathway to engineer an optimal electrolyte for targeted electrochemical systems.

Research Organization:
Pacific Northwest National Lab. (PNNL), Richland, WA (United States). Environmental Molecular Sciences Lab. (EMSL)
Sponsoring Organization:
USDOE Office of Science (SC), Biological and Environmental Research (BER); USDOE Office of Electricity (OE)
Grant/Contract Number:
10673090 B2; AC05-76RL01830; 57558
OSTI ID:
1877719
Alternate ID(s):
OSTI ID: 1774002
Report Number(s):
PNNL-SA-161062; S2666386421000035; 100323; PII: S2666386421000035
Journal Information:
Cell Reports Physical Science, Journal Name: Cell Reports Physical Science Vol. 2 Journal Issue: 2; ISSN 2666-3864
Publisher:
ElsevierCopyright Statement
Country of Publication:
United States
Language:
English

References (39)

Effect of the damping function in dispersion corrected density functional theory journal March 2011
1:14 Heteropolyvanadate of phosphorus: preparation and structure journal October 1980
Intercalation of Polyvalent Cations into V2O5 Aerogels journal March 1998
Synthesis and crystal structure of α-NH4(VO2)(HPO4) journal April 1992
Vanadium-51 and oxygen-17 nuclear magnetic resonance study of vanadate(V) equilibria and kinetics journal January 1981
A thermodynamic model for vanadate in aqueous solution – equilibria and reaction enthalpies journal January 2013
A review of electrolyte additives and impurities in vanadium redox flow batteries journal September 2018
Vanadium Oxide Oligomers and Ordered Monolayers Supported on CeO 2 (111): Structure and Stability Studied by Density Functional Theory journal April 2018
51 V magic angle spinning NMR in VOPO 4 phases: 51 V magic angle spinning NMR in VOPO 4 phases journal September 2004
The crystal and molecular structure of oxovanadium(V) orthophosphate dihydrate, VOPO4,2H2O journal January 1981
Structural Diversity of the Oxovanadium Organodiphosphonate System:  A Platform for the Design of Void Channels journal April 2006
Recent Progress in Redox Flow Battery Research and Development journal September 2012
Evaluation of Precipitation Inhibitors for Supersaturated Vanadyl Electrolytes for the Vanadium Redox Battery journal January 1999
Chloride supporting electrolytes for all-vanadium redox flow batteries journal January 2011
Investigation of Ion–Solvent Interactions in Nonaqueous Electrolytes Using in Situ Liquid SIMS journal February 2018
From ultrasoft pseudopotentials to the projector augmented-wave method journal January 1999
Raman Study of Sulfuric Acid at Low Temperatures journal July 1998
In Situ Liquid Secondary Ion Mass Spectrometry: A Surprisingly Soft Ionization Process for Investigation of Halide Ion Hydration journal April 2019
Towards understanding the poor thermal stability of V5+ electrolyte solution in Vanadium Redox Flow Batteries journal April 2011
Vanadium phosphates on mesoporous supports: model catalysts for solid-state NMR studies of the selective oxidation of n-butane journal April 2009
Synthesis and Crystal Structure of a New Vanadyl Phosphate [H 0.6 (VO) 3 (PO 4 ) 3 (H 2 O) 3 ]·4H 2 O and Its Conversion to Porous Products journal July 2001
Synthesis and Crystal Structure of Decavanadate-Based Coordination Polymers journal May 2018
Chemistry with ADF journal January 2001
Synthetic pathways to vanadyl phosphates journal February 1989
Raman Microspectrometry Study of Electrochemical Lithium Intercalation into Sputtered Crystalline V 2 O 5 Thin Films journal March 2008
The Effect of Additives on the High-Temperature Stability of the Vanadium Redox Flow Battery Positive Electrolytes journal November 2015
51 V FT-nmr investigations of metavanadate ions in aqueous solutions journal November 1980
51 V MAS NMR Investigation of 51 V Quadrupole Coupling and Chemical Shift Anisotropy in Divalent Metal Pyrovanadates journal January 2001
Vanadium redox cell electrolyte optimization studies journal May 1990
Elucidating the higher stability of vanadium(V) cations in mixed acid based redox flow battery electrolytes journal November 2013
α-Ammonium Vanadium Hydrogen Phosphate, α-(NH 4 )V(HPO 4 ) 2 journal September 1998
Structure of vanadium phosphate anion in solutions from17O,51V and31P NMR data journal June 1981
Comment on “Generalized Gradient Approximation Made Simple” journal January 1998
A Stable Vanadium Redox-Flow Battery with High Energy Density for Large-Scale Energy Storage journal March 2011
Structure and stability of hexa-aqua V(iii) cations in vanadium redox flow battery electrolytes journal January 2012
Hetero and lacunary polyoxovanadate chemistry: Synthesis, reactivity and structural aspects journal October 2011
Facile synthesis of ammonium vanadate nanofibers by using reflux in aqueous V 2 O 5 solution with ammonium persulfate journal June 2017
Lattice Dynamics of β-V 2 O 5 : Raman Spectroscopic Insight into the Atomistic Structure of a High-Pressure Vanadium Pentoxide Polymorph journal February 2012
Understanding Aqueous Electrolyte Stability through Combined Computational and Magnetic Resonance Spectroscopy: A Case Study on Vanadium Redox Flow Battery Electrolytes journal September 2014