Truly Sustainable Energy Storage
Discover Redox One’s innovative Iron-Chromium Redox Flow Battery technology, delivering safe, sustainable and cost-effective long-duration energy storage solutions.
Why Flow Batteries?
0 GWh
By 2030
Exponential Growth
Meeting Tomorrow’s Energy Needs Today.
As the world expands its wind and solar generation to over 1,000 GW by 2030, the demand for Long Duration Energy Storage (LDES) will skyrocket. To match this growth, LDES must increase from less than 200 GWh today to over 5,000 GWh, a 25-fold scale-up. Flow batteries, with their scalability and multi-hour capacity, are the key to making this transition possible.
Net-Zero Target
Unlocking Sustainable Grid Resilience.
To achieve global net-zero goals, the world will require up to 140 TWh of LDES by 2040. That’s storage on a massive scale, only achievable with solutions that are not just efficient, but also safe, cost-effective, and environmentally sustainable. Redox flow batteries, based on earth-abundant iron and chromium, deliver on all fronts.
0 TWh
By 2040
$ 0 Trillion
by 2040
Future-Proofing
Powering a Decarbonised Future.
Annual investment in energy storage must grow more than 15x to meet climate goals (IEA, World Energy Investment 2023). To manage the growing mismatch between renewable generation and demand, long-duration storage solutions will be essential. Redox One’s Iron-Chromium technology is built for this challenge—delivering the scale and reliability needed to power the $3 trillion energy storage market by 2040.
Cost-effective
Our proprietary, patented electrolyte production process uses ore with over 40 wt% of key active elements, in contrast to typical vanadium sources containing less than 0.5 wt%. This high concentration eliminates the need for energy- and cost-intensive purification, reducing electrolyte production costs by up to 80%. Combined with the inherent phase stability of the Iron-Chromium system, the electrolyte remains a long-lived, reusable asset capable of delivering performance over decades.
Abundant
By leveraging the massive terawatt-hour-scale potential of existing Iron and Chromium mining—Iron being the 4th most abundant element in the Earth’s crust and Chromium among the top 10 metals by production—our supply chain avoids reliance on critical raw materials. Unlike lithium-ion batteries or vanadium flow batteries, we utilize high-grade ore with over 40 wt% Chromium, compared to less than 0.5 wt% in typical vanadium sources, enabling simpler, more cost-effective processing and greater supply security.
Reliable
Our Iron-Chromium electrolyte remains in a single phase throughout charge and discharge, eliminating cycle-induced degradation and enabling long system life. This chemical stability reduces complexity in the battery management system, allowing precise state-of-charge estimation and system diagnostics. A built-in balancing system actively maintains volumetric and electrochemical equilibrium between the two electrolyte tanks, ensuring consistent performance and high operational reliability.
Safe
Engineered for safety and environmental resilience, our nonflammable aqueous Iron-Chromium electrolyte is thermally stable up to 60°C, with no risk of thermal runaway or fire. Its low corrosivity eliminates the need for special handling beyond standard secondary containment.
Secured
Redox One’s partnership with Tharisa provides exclusive and direct access to a nearly unlimited quantity of essential raw materials. This secure supply chain guarantees a stable and dependable source of electrolyte, supporting our long-term production goals and ensuring consistent availability for our customers for decades to come.
Truly Sustainable
Our Iron-Chromium electrolyte boasts impressive sustainability features, being 100% reusable within our processes and completely recyclable at the end of its useful life.
Most Resilient Long Duration Energy Storage Solution
Li-Ion has significant capacity fade over time and needs full replacement after ~10 years.
Iron-Chromium Redox Flow Batteries have virtually no capacity decay and limitless cycle and calendar life provided regular maintenance schedules are followed.
How Redox Flow Batteries Work
Both electrolyte tanks contain equal concentrations of Iron (Fe) and Chromium (Cr).
Instead of two solid electrodes wound in a conventional cell-based battery, energy is stored by galvanic reactions transferring an electron, without ‘plating’ (no phase change), merely changing the charge state of the respective metal ions in each side of the electrolyte. These electrolytes are stored in tanks pumped through a stack of cells. Charging stores energy by increasing the charge state of iron ions in solution while reducing chromium ions in opposing solution. Discharging is achieved by reversing polarity, and increasing the state of chromium ions while reducing the iron ions.
Mixed Species Electrolytes Eliminate Crossover – Both tanks have equal concentrations of Iron Fe and Chromium Cr ion so there’s no net diffusion across the separator during battery operation.
Energy Shift
Energy Shift
Peak Solar
Generation
Energy demand high, solar capacity low.
Energy demand low, solar capacity high.
Energy demand high, solar capacity low.
Scalable
Simple
Just like pumping water through a pool filter, our batteries pump electrolye through a cell stack to charge / discharge. Direct access to the electrolyte in our tanks guarantees accurate readings for both the State of Health and the State of Charge of the battery unlike traditional encapsulated batteries.
Responsive
This system boasts rapid responsiveness, capable of tracking the electrical load in real-time. It can seamlessly increase or decrease its power output and transition between charging and discharging states in mere milliseconds, offering unparalleled flexibility.
Frequently Asked Questions
Why Flow Batteries
Why Iron-Chromium
What’s Needed for Long Duration Energy Storage?
Sustainable Storage Solutions
Dive Deeper into Fe-Cr RFB Technology
Interested in seeing how Redox One’s innovative Iron-Chromium Redox Flow Battery technology can meet your long-duration energy storage needs? Enquire about booking a demonstration to learn firsthand about its safety, reliability and scalability for various applications.