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Hybrid Radical Energy Storage Device

National Renewable Energy Laboratory

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Technology Marketing Summary

In order to provide a cost effective, environmentally benign and efficient means for storing electric energy from renewable sources, breakthroughs are needed in rechargeable battery technology that will substantially increase energy and power densities. Practical deployment of the batteries for transportation also requires them to be of low cost and safe. Organic radical batteries (ORBs) are a relatively new class of rechargeable batteries that are based on the utilization of stable organic radical molecular/polymer compounds as the cathode electrode within a high performance battery. The radical polymer electrodes can contain densely populated unpaired electrons in the pendant radical groups that are chemically stabilized via steric and/or pre-designed resonance effects. These stabilized radical systems are characterized by very fast electron-transfer processes that are the basis for the efficient performance of these systems in secondary batteries. These radical polymers are utilized as alternatives to inorganic metal-oxide or sulfur based materials as the primary cathode in the battery.

ORBs have several advantages over conventional batteries. ORBs are safer than conventional inorganic batteries because they are non-flammable, adaptable to wet fabrication processes, easily disposable, flexible, and can be fabricated via “green” chemical processes. These high energy, safe, stable and greener systems also have extraordinary cycle life. The ORB is capable of several thousand deep (>80%) charging and discharging cycles at high rates/loads at full utilization of the capacity without performance loss (within 90% of initial performance). However, the major limitation for this technology is that the current charge storage capacity and specific energy of the present-day ORB is significantly lower than that of a conventional Li-ion battery.

The capacity of the most common ORB cathode active material is 110-130 mAh/g, which is less than the capacity of current cathode materials (150-170 mAh/g) in conventional Li-ion batteries. Therefore, there is a need for the design of and synthesis of new polymeric compounds with higher radical concentrations in order to significantly improve capacity and to make ORBs viable competitors for existing technologies.

Description

Scientists at the National Renewable Energy Laboratory (NREL) have developed a hybrid organic radical cathode coupled with a carbon nanotube radical anode, achieving a higher performance level than any other organic radical based battery versus a carbon based anode. This technology allows for a projected 2.8 – 3.5 volt cell that delivers 560 – 800 Whr/kg and 600 – 700 Wh/liter at C/3, without a lithium metal oxide component. 

 

Benefits
  • Increased safety (non-flammable)
  • Adaptability to wet fabrication processes
  • Easy disposability
  • Flexibility (plastic)
  • Fabrication via "green" chemical processes
  • Extraordinary cycle life
  • Charge discharge rates > 10 

 

Applications and Industries
  • Batteries
  • Energy storage
  • Electrodes
  • Electrolytes 

 

Patents and Patent Applications
ID Number
Title and Abstract
Primary Lab
Date
Patent 8,940,444
Patent
8,940,444
Hybrid radical energy storage device and method of making
Hybrid radical energy storage devices, such as batteries or electrochemical devices, and methods of use and making are disclosed. Also described herein are electrodes and electrolytes useful in energy storage devices, for example, radical polymer cathode materials and electrolytes for use in organic radical batteries.
National Renewable Energy Laboratory 01/27/2015
Issued
Patent 9,324,992
Patent
9,324,992
Hybrid radical energy storage device and method of making
Hybrid radical energy storage devices, such as batteries or electrochemical devices, and methods of use and making are disclosed. Also described herein are electrodes and electrolytes useful in energy storage devices, for example, radical polymer cathode materials and electrolytes for use in organic radical batteries.
National Renewable Energy Laboratory 04/26/2016
Issued
Technology Status
Technology IDDevelopment StageAvailabilityPublishedLast Updated
NREL ROI 10-66ProposedAvailable01/13/201601/13/2016

Contact NREL About This Technology

To: Erin Beaumont<erin.beaumont@nrel.gov>