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Firefly Energy

Founded Year



Dead | Dead

Total Raised


About Firefly Energy

Firefly Energy is aiming to reinvent lead acid for energy density and cyclability. Firefly Energy has developed two technologies that aims to deliver advanced battery performance for an entire spectrum of uses served by lead acid, nickel, and lithium based chemistries. The two technologies, 3D and 3D2, involve the use of a porous three dimensional material in either flooded or VRLA (valve-regulated lead acid) battery designs. Implementation of this technology successively aims to do away with the corrodible lead grids found in conventional lead acid battery design, and allows delivery of the full power potential of lead acid chemistry for energy storage. Firefly Energy believes this breakthrough delivers a formidable jump in specific power, energy, and cycle life. The resulting products according to Firefly Energy possess performance parameters comparable to advanced materials (Lithium and Nickel-based) batteries, but at costs far below these high performance batteries. Fireflys technology is based on material science that aims to remove almost all limitations of current lead-acid battery products. Per Firefly, the materials also hold the promise of major simplification for manufacturing of lead-acid batteries and will potentially deliver more flexible form factors or configurations. According to Firefly Energy, the company has developed advanced battery architectures. They use Microcell composite foam grids which are impregnated with a slurry of lead oxides which are then formed up to the sponge lead and lead dioxide in the normal fashion. Because of the foam structure, the resultant negative and positive plates have enormous surface-area advantages over conventional lead acid grid structures. This results in much-improved active material utilization levels (i.e. from the historical 20-50% up into the range of 70-90%) as well as enhanced fast-recharge capability and greater high-rate / low-temperature discharge times. According to the company, the signal advantage of Fireflys Microcell Technology is that it fundamentally changes the performance of active materials within the lead acid cell due to its unique architecture. Overall, the Firefly foam electrode structure results in a redistribution of most of the electrolyte (the biggest resistor in a lead acid battery) into the pores of the foam plate, in closer proximity to the lead chemistry. This is in contrast to a traditional lead acid battery, where most of the electrolyte is in the separator, more distant from the plates chemistry. Each foam wafer contains hundreds or thousands of spherical microcells (depending on the foam pore diameters). This leads to enhanced active-material utilization levels because each microcell has its full complement of sponge lead or lead dioxide and sulfuric acid electrolyte. Liquid diffusion distances are reduced from the traditional levels of millimeters over linear paths (the conventional 2D diffusion mechanism) to the level of microns in the three-dimensional space within the discrete microcells that collectively comprise a totally new type of electrode structure (what Firefly calls a 3D electrode). Such a structure results in much higher power and energy delivery and rapid recharge capabilities relative to conventional lead acid products. These foam electrodes can be used in either flooded or VRLA battery designs. The company filed for Chapter 7 Bankruptcy in March 2010.

Headquarters Location

6533 North Galena Road Arbor Hall, 2nd Floor

Peoria, Illinois, 61614,

United States


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Expert Collections containing Firefly Energy

Expert Collections are analyst-curated lists that highlight the companies you need to know in the most important technology spaces.

Firefly Energy is included in 2 Expert Collections, including Energy Storage.


Energy Storage

1,232 items

This collection includes large and small energy storage technology, from grid-scale molten salt containers to small, thin-film lithium-ion batteries.


Grid and Utility

1,554 items

This collection includes companies that are working on software and hardware to improve grids, utilizing new pricing models, and developing microgrids.

Firefly Energy Patents

Firefly Energy has filed 3 patents.

The 3 most popular patent topics include:

  • Energy storage
  • Gas technologies
  • Industrial gases
patents chart

Application Date

Grant Date


Related Topics




Natural gas storage, Industrial gases, Energy storage, Gas technologies, Natural gas


Application Date


Grant Date



Related Topics

Natural gas storage, Industrial gases, Energy storage, Gas technologies, Natural gas



Latest Firefly Energy News

Recurrent Energy to divest 150MWac solar project in Virginia

Jan 6, 2022

The acquisition of the Firefly Energy project is said to be Appalachian Power's largest to date. The post Recurrent Energy to divest 150MWac solar project in Virginia appeared first on Power Technology.

Firefly Energy Frequently Asked Questions (FAQ)

  • When was Firefly Energy founded?

    Firefly Energy was founded in 2003.

  • Where is Firefly Energy's headquarters?

    Firefly Energy's headquarters is located at 6533 North Galena Road, Peoria.

  • What is Firefly Energy's latest funding round?

    Firefly Energy's latest funding round is Dead.

  • How much did Firefly Energy raise?

    Firefly Energy raised a total of $31M.

  • Who are the investors of Firefly Energy?

    Investors of Firefly Energy include Bank One, KB Partners, Illinois Development Finance Authority, Caterpillar, Central Illinois Angels and 9 more.

  • Who are Firefly Energy's competitors?

    Competitors of Firefly Energy include BrightVolt, Kokam, Boston-Power, A123 Systems, FlexEl and 11 more.

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