Explore the 10 Top Flow Battery Startups to Watch in 2023

Will flow batteries accelerate the energy transition and support critical infrastructure? Discover 10 hand-picked Flow Battery Startups to Watch in 2023 in this report & learn how their solutions impact your business. These solutions span long-duration and grid-scale energy storage, scalable flow batteries, waste-to-battery, and more!

Global Startup Heat Map highlights 10 Flow Battery Startups to Watch in 2023

Through the Big Data & Artificial Intelligence (AI)-powered StartUs Insights Discovery Platform, covering over 3 790 000+ startups & scaleups globally, we identified 167 Flow Battery startups. The Global Startup Heat Map below highlights the 10 Flow Battery startups you should watch in 2023 as well as the geo-distribution of all flow battery startups & scaleups we analyzed for this research. Based on the heat map, we see high startup activity in the US, followed by UK and Germany. These flow battery startups work on solutions ranging from grid-scale energy storage and novel battery materials to battery recycling and organic flow batteries.


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As the world’s largest resource for data on emerging companies, the SaaS platform enables you to identify relevant technologies and industry trends quickly & exhaustively. Based on the data from the platform, the top startup hub in the flow battery ecosystem is London, followed by New York City and Singapore. Cambridge and Munich are the other major flow battery startup hubs. The 10 hand-picked startups highlighted in this report are chosen from all over the world and develop solutions for better battery performance, battery recycling, and bio-based battery materials.

10 Top Flow Battery Startups to Watch in 2023

Advances like high-performance materials, machine learning, and automation are revolutionizing flow batteries, a type of rechargeable battery that uses two liquid electrolytes to store energy. By utilizing nanomaterials in the construction of electrodes and membranes, flow batteries achieve higher power densities and longer lifetimes. Machine learning algorithms also optimize battery performance and extend battery life by predicting degradation and adjusting operational parameters accordingly. Automation is streamlining manufacturing processes and reducing costs. Use cases for flow battery innovations include grid-scale energy storage, renewable energy integration, and backup power for critical infrastructure. Overall, these technologies are enabling the development of more efficient, reliable, and cost-effective flow batteries.

      1. Sinergy Flow – Multi-Day Redox Flow Battery
      2. Cellfion – Redox Flow Membranes
      3. Fluxx XII – Organic Flow Batteries
      4. Quino Energy – Water-based Flow Batteries
      5. Zhonghe Energy Storage – Liquid-Flow Batteries
      6. POLYKEY – Flow Battery Polymer
      7. Allegro Energy – Long-Duration Energy Storage
      8. Luquos Energy – Scalable Flow Battery Technology
      9. Cancrie – Waste-To-Battery Material
      10. Forever Energy – On-Site Solar Energy Storage


Sinergy Flow creates a Multi-Day Redox Flow Battery

Sinergy Flow is an Italian startup that develops a modular and scalable redox flow battery for energy storage on a multi-day basis. It features a customizable energy-to-power (E/P) ratio that allows utilities to tailor battery performance based on specific project needs. This allows for usage of up to 10 hours at a time. Sinergy Flow also uses sulfur, a byproduct of the petrochemical industry, in its battery technology. This ensures sustainability and lower construction costs. Sinergy’s redox flow battery, with its longer lifetime and simple structure, makes it an efficient and sustainable energy storage solution.

Cellfion manufactures Redox Flow Membranes

Swedish startup Cellfion creates bio-based membranes for electrochemical energy storage and conversion devices. The startup makes membranes from nano cellulose with high mechanical strength, biocompatibility, and ion selectivity. This makes it an ideal material for redox flow membranes. The startup manufactures these membranes for organic redox flow batteries and polymer electrolyte membrane (PEM) electrolyzers. These batteries also facilitate large-scale energy storage to support the grid, particularly with intermittent renewable energy sources. Cellfion’s bio-membranes ensure higher performance, lower cost, and reduced environmental impact during flow battery manufacturing. This, in turn, allows energy providers to leverage long-term energy storage with minimal performance degradation.

Flux XII offers Organic Flow Batteries

Flux XII is a US-based startup that makes organic flow batteries for grid energy storage. The startup utilizes organic molecules containing carbon (C12) as the active materials in its battery electrolytes. It then dissolves the carbon molecules in benign, pH-neutral water to power the flow battery system. This approach eliminates the need for mining or hectic supply chains, making renewable energy integration more reliable and affordable. Flux XII’s batteries offer long-duration energy storage solutions for the grid, as well as support peak shaving, frequency regulation, and microgrid balancing. These applications benefit energy stakeholders by reducing emissions and enhancing grid reliability.

Quino Energy develops Water-based Flow Batteries

US-based startup Quino Energy creates water-based flow batteries for grid-scale energy storage. The startup leverages organic quinone molecules that easily transition between reduced hydroquinone and oxidized quinone forms as electrolytes. Quino Energy produces quinones sustainably from dyestuffs, making it a cost-effective option. Even after decomposition, the decomposed quinones are capable of restoration to the original flow battery reactants by subjecting them to mild oxidation periodically. These flow batteries also feature better fire safety as the battery reactants dissolve in water. Moreover, the startup’s battery does not produce any hydrogen gas during charging, making it more efficient and sustainable for energy storage.

Zhonghe Energy Storage provides Liquid-Flow Batteries

Zhonghe Energy Storage is a Chinese startup that produces liquid-flow batteries for grid energy storage. These batteries store energy in liquid electrolytes and pump it through a cell stack to generate electricity. This technology enables better performance and high cycle times, making it suitable for energy storage for up to 6 to 12 hours. The startup also incorporates high-performance electrodes and low-cost diaphragms to reduce system costs. Additionally, Zhonghe Energy Storage develops a calculator tool, NeLCOS, for optimizing energy storage systems. Overall, these solutions enable energy providers to use renewable energy sources more efficiently and allow consumers to reduce electricity costs.




POLYKEY develops a Flow Battery Polymer

POLYKEY is a Spanish startup that offers a polymer for electrochemical energy storage devices such as flow batteries and supercapacitors. In comparison to current materials, the startup’s material is lighter, enables higher energy storage, and performs better at high temperatures. The startup uses plastic waste as a sustainable and cost-effective feedstock for its polymer. POLYKEY bases this technology on organic redox-active molecules that are abundant, cost-effective, and environmentally friendly. The startup’s products thus allow utilities to leverage large-scale and long-duration energy storage to facilitate renewable energy integration, grid stabilization, and power backup.

Allegro Energy advances Long-Duration Energy Storage

Australian startup Allegro makes a redox flow battery technology for long-duration energy storage. The startup leverages a non-corrosive and non-flammable electrolyte, making the battery safe and sustainable. It is capable of releasing energy for over 4 hours and has a lower levelized cost of storage (LCOS) than traditional energy storage methods. Energy providers customize the startup’s technology to meet specific energy storage needs, making it a flexible solution for a variety of applications. Allegro’s redox flow battery offers higher energy density and adapts to any environment.

Luquos Energy makes Scalable Flow Battery Technology

Luquos Energy is a Chinese startup that develops scalable flow battery technology for energy storage. The startup’s aqueous electrolyte and earth-abundant elements store and provide renewable energy on demand. It is safe as the non-flammable electrolyte and non-toxic active materials eliminate the risk of fire and environmental pollution. The technology features a longer cycle life than conventional lithium-ion batteries, resulting in lower costs and better performance. It also provides steady power output for a longer period of time, making it ideal for supporting EV solar chargers. This also enables uninterrupted power supply for critical facilities such as data centers and base stations.

Cancrie develops a Waste-To-Battery Material

US-based startup Cancrie produces an advanced material made from waste for vanadium redox flow batteries (VFRB). It is a drop-in solution that comes from bio-based renewable resources, such as biomass and agricultural waste. Battery manufacturers leverage the startup’s patented technology and tailor it for different applications, such as batteries and capacitors. Moreover, it enhances the electrochemical properties and durability of the electrodes to improve VFRB performance and efficiencies. The startup also minimizes the use of precious metals and toxic chemicals to reduce the environmental impact and cost of energy storage devices. This enables utilities to utilize VRFBs for electrical peak shaving, load leveling, and more in large stationary energy storage situations where volume and weight are not limiting factors.

Forever Energy offers On-Site Solar Energy Storage

Forever Energy is a US-based startup that provides FEv, a vanadium-based solar energy storage system for home and commercial use. It comprises a solar panel that converts sunlight into electricity and a vanadium-based battery that stores the excess energy for later use. The battery is capable of changing its oxidation state and storing charge in a liquid electrolyte, allowing it to have a longer lifespan, high energy density, and low maintenance. Forever Energy’s system helps utilities and energy companies reduce their carbon footprint and aids renewable integration.

Discover All Emerging Energy Startups

The energy startups showcased in this report are only a small sample of all startups we identified through our data-driven startup scouting approach. Download our free Energy Innovation Report for a broad overview of the industry or get in touch for quick & exhaustive research on the latest technologies & emerging solutions that will impact your company in 2023!

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