Hybrid Radical Energy Storage Device with Solid-State Electrolyte
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Solution Overview
Problem
Current organic radical batteries (ORBs) have a significantly lower charge storage capacity and specific energy compared to conventional Li-ion batteries, limiting their viability for widespread adoption in renewable energy storage and transportation applications.
Innovation Solution
A hybrid solid-state electrochemical device is developed, featuring a pre-lithiated nanostructured anode, a stable polymeric organic radical-based cathode, and a high-performance solid-state polymer electrolyte, which enhances energy storage capacity and stability, enabling flexible, safe, and efficient energy storage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If organic radical polymer materials are used as cathode active material, then safety and stability are improved (non-flammable, stable), but charge storage capacity and specific energy are significantly reduced (110-130 mAh/g vs 150-170 mAh/g)
Solution Approach 1:
The patent employs composite materials by combining organic radical polymer cathode materials with specific electrolyte compositions and nanostructured anodes. The solid polymer electrolyte contains lithium salt dispersed in the polymer matrix, creating a composite structure that enhances both safety and capacity. The nanostructured anode materials (such as silicon-nanowire arrays or lithium iron phosphate nanocrystals) further contribute to the composite architecture, enabling higher lithium insertion/extraction capacity while maintaining the inherent safety advantages of organic radical systems.
2Speed
If radical polymer electrodes with densely populated unpaired electrons are used, then electron-transfer processes are accelerated (fast kinetics), but capacity is limited by the density of radical groups
Solution Approach 1:
The patent applies local quality by creating regions of high radical density within the polymer structure while maintaining overall structural integrity. The nitroxide radical groups are strategically positioned in the polymer chains, creating localized zones of high electron-transfer activity. This localized concentration of reactive sites enhances kinetics without requiring uniform distribution throughout the entire electrode, thereby improving capacity while maintaining fast electron transfer rates.
3Quantity of substance
If conventional inorganic cathode materials are used, then charge storage capacity is high (150-170 mAh/g), but safety is compromised (flammable, less stable)
Solution Approach 1:
The patent changes the fundamental parameters of the battery system by transitioning from inorganic to organic materials. The organic radical polymer cathode operates at lower voltages compared to conventional inorganic cathodes, which inherently improves safety. The solid polymer electrolyte eliminates the use of flammable liquid electrolytes, removing a major safety hazard. These parameter changes—material composition, operating voltage, and electrolyte state—collectively achieve both high capacity and enhanced safety.
4Reliability
If solid-state polymer electrolyte is used, then safety and stability are improved (reduced flammability, minimal temperature effects), but ionic conductivity may be reduced compared to liquid electrolytes
Solution Approach 1:
The solid polymer electrolyte is formulated as a composite material containing lithium salt dispersed within the polymer matrix. This composite structure provides pathways for ionic conduction through the lithium salt regions while the polymer matrix maintains structural integrity and safety. The nanostructured anode interface further enhances ionic conductivity by providing large surface area contact points that facilitate efficient ion transfer, compensating for the inherently lower conductivity of solid polymers compared to liquids.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The device achieves a projected 560-800 Whr/kg and 600-700 Wh/liter energy density with minimal temperature effects and reduced flammability, maintaining 90% performance after 1000 cycles, making it suitable for plug-in hybrid-electric vehicles and baseload storage.
Implementation Method 1
an anode composed of a pre-lithiated nanostructured material
Implementation Method 2
a cathode composed of a stable polymeric organic radical-based material
Implementation Method 3
an electrolyte composed of a high performance solid-state polymer
Data Source
AI summary
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.