Redox Flow Battery Electrolyte Composition for Energy Density

The patent applies multi-functionality by selecting metal ions (vanadium, chromium, iron, cobalt, copper, molybdenum, ruthenium, palladium, silver, tungsten, mercury, or cerium ions) that simultaneously serve two functions: (1) suppress precipitate generation in the positive electrode electrolyte, and (2) function as active materials contributing to charge-discharge reactions. This resolves the contradiction by making the additive ions universally useful for both stability and energy storage, eliminating the need to choose between precipitate suppression and energy density.

The patent changes the chemical composition parameters of the positive electrode electrolyte by specifically selecting metal ions with appropriate redox potentials that can exist stably in the electrolyte environment while providing both precipitate suppression and electrochemical activity. By adjusting the type and concentration of these multifunctional metal ions, the system achieves optimal balance between stability and energy density.

The patent changes the concentration parameter of active materials in the electrolyte by introducing multifunctional metal ions that increase the ratio of active material. This allows achieving high battery capacity with smaller electrolyte volumes, thereby reducing tank size and overall system footprint while maintaining or improving capacity.

The patent creates a composite electrolyte system by combining multiple metal ions (manganese ions as base active material plus additional multifunctional metal ions) that work synergistically. This composite approach increases the effective active material content per unit volume of electrolyte, enabling higher capacity in a more compact system.