Tuesday, 15 May 2018
Ballroom 6ABC (Washington State Convention Center)
New all vanadium with bi-additive electrolyte has 30% higher energy density and 80% wider temperature window which will be a promising energy storage option for the future grid. The solubility of the vanadium ions was improved to 2.0M, in a much wider temperature range from -5 to 50⁰C.
Our new bi-additive system containing (NH4)2HPO4 increases the V5+ intermolecular distance from ~5 angstrom to ~8 angstrom which has greatly improved the V5+ electrolyte stability and solubility. Based on the computer simulation results, two V5+ molecular will form complex with one HPO4 which will significantly increase the distance between the two V5+ molecular.
. With the new vanadium electrolyte, we demonstrated both on-line charge/discharge cycling and off-line static electrolyte stability study of at 2.0M vanadium concentration at -5 and 50⁰C. The new additive-assisted vanadium electrolyte provides a revolutionary solution to boost the VRB’s performance, stability, and cost to a whole new level.