Oscillating Electric Field for Polymer Electrolyte Ion Diffusion
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Solution Overview
Problem
Polymer electrolyte materials in lithium-ion batteries exhibit low ionic diffusivity due to strong lithium ion binding with polymer chains, limiting their conductivity and widespread adoption despite potential advantages over traditional liquid electrolytes.
Innovation Solution
Applying an oscillating electric field with specific frequency and amplitude within the polymer electrolyte to reduce the hopping barrier for lithium ions, enhancing their diffusion and conductivity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If polymer electrolyte materials are used in lithium-ion batteries, then safety and energy density are improved, but ionic conductivity deteriorates due to strong lithium ion binding with polymer chains
Solution Approach 1:
The patent applies periodic oscillating electric fields to the polymer electrolyte to enhance lithium ion diffusion. The oscillating field periodically modulates the polymer chain conformations and electrostatic interactions, creating transient diffusion pathways that overcome the strong binding between lithium ions and polymer chains, thereby improving ionic conductivity while maintaining the safety advantages of polymer electrolytes
2Strength
If polymer electrolyte materials are used in lithium-ion batteries, then mechanical properties and flexibility are improved, but ion mobility deteriorates due to strong lithium ion binding
Solution Approach 1:
The patent introduces dynamic oscillating electric fields that continuously modulate the polymer electrolyte structure. This dynamic approach allows the polymer chains to transition between different conformational states, creating temporary channels for lithium ion transport while maintaining the overall mechanical integrity and flexibility of the polymer electrolyte material
3Object-generated harmful factors
If traditional liquid electrolytes are used, then high ionic conductivity is achieved, but safety and lifespan deteriorate
Solution Approach 1:
The patent changes the physical state parameter of the electrolyte from liquid to polymer solid, while using oscillating electric fields to compensate for the reduced ionic conductivity. This parameter change eliminates the safety hazards associated with liquid electrolytes (leakage, flammability) while the applied oscillating fields maintain adequate ion transport by modulating the polymer structure to facilitate lithium ion diffusion
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 application of an oscillating electric field increases the diffusion constant of lithium ions by up to three orders of magnitude, improving ion mobility and conductivity in polymer electrolytes, thereby addressing the limitations of traditional liquid electrolytes.
Implementation Method 1
Applying an oscillating electric field with specific frequency and amplitude within the polymer electrolyte to reduce the hopping barrier for lithium ions, enhancing their diffusion and conductivity
Implementation Method 2
The application of an oscillating electric field increases the diffusion constant of lithium ions by up to three orders of magnitude, improving ion mobility and conductivity in polymer electrolytes
Data Source
AI summary
Battery systems and methods for accelerating ion diffusion in polymer electrolyte materials. The application of oscillating electric fields is used to improve the ionic transport properties of polymer electrolytes by reducing the apparent hopping barrier of the lithium ions within the electrolyte material. Polymer-electrolyte-based battery cells exhibiting enhanced ion mobility due to the application of such oscillating electric fields.