Vanadium Redox Flow Battery

Abstract/Technology Overview

A stacked redox flow battery having an integrated thin film electrode with a tandem structure accomplishes great battery efficiency per unit volume by reducing the volume of the electrode and cell.

An additive overcoming the problem of an electrolyte is developed to address the problem with a battery with lowered power density resulting from insoluble deposition of a conventional redox flow battery so that the performance is increased twice the conventional performance.

1.     A technique of a tandem electrode-based redox flow battery in which two electrodes are inserted into a unit cell constituting a stack to increase a voltage twice as much so that efficiency is increased.

2.     An additive that refrains insoluble deposition at the high temperature of VRFB is developed to delay and refrain deposition at a high temperature (40 ℃ or higher).

Vanadium of a vanadium redox flow battery causes a change in price depending on demand and has not been domestically produced. Use of organic-based materials for a neutral supporting electrolyte may overcome the above problem, and the problem with the existing VRFB showing lowered energy density.

Technology Features, Specifications and Advantages

The vanadium redox flow battery is a unit cell including BOP such as an electrolyte tank and a pump, an electrode, a manifold, and a bipolar plate, and is formed of a stack in which the unit cells are stacked.

1.     Technology capable of increasing electric power twice by inserting two electrodes into a unit cell constituting the stack in serial and parallel manner.

2.     Since an integrally formed thin film electrode is used, it can simultaneously function to be bipolar and as an electrode, and its size is reduced by 1/20 compared to the existing technology so that output density is increased twice its original density when constituting the cell and stack.

Na+ that is a component of an electrolyte additive adjusts pH of the electrolyte, and phosphate forms a complex with vanadium to refrain deposition.

Potential Applications

  • A battery for electric power storage of new renewable energy (sunlight, wind power, etc.)
  • A next generation battery applicable to tropical regions such as the Middle East, Africa, etc. based on temperature stability.
  • A battery for smart grid/microgrid electric power storage.
  • An uninterruptible power device for home/building/factory.

Electric power transmission and supply equipment through adjustment of a frequency using ESS.

Customer Benefit

ESS is within the field of a new industry globally spotlighted as electrochemical energy storage technology using a secondary battery (secondary battery technology).

  • The global ESS market sales scale grew by about five times from USD 462 million (about KRW 511.8 billion) in 2014 to USD 2.1 billion (about KRW 2326.8 billion) in 2015.
  • New renewable energy-connected ESS capacity will be increased from 196 MW in 2015 to 12.7 GW in 2025.

The market size will increase at an annual average rate of about 55% for the next 10 years from 2014 to reach USD 16.5 billion (about KRW 1.82 trillion) in 2024, which is about 40 times the present market size, and thus its potential growth is evaluated to be high.

In the new renewable energy grid industries that require high-capacity electric power, the desired amount of electric power can be designed by adjusting the electrolyte tank and the stack.

Contact Person

Jaeeun Lee


DeltaTech-Korea Ltd

Technology Category
  • Battery & SuperCapacitor
Technology Readiness Level
  • TRL 6

Redox, vanadium, tandem electrodes, stack, elecctrolyte, additive, ESS