Spinodal Bicontinuous Battery Electrodes for Power Density
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Solution Overview
Problem
Conventional battery electrodes face limitations in achieving high power and energy densities due to non-uniform pore structures and deposition methods that hinder efficient ion and electron transport, leading to restricted power delivery and energy storage capabilities.
Innovation Solution
A method for creating composite electrodes with a uniform pore structure and controlled active material thickness, using a bicontinuous interfacially jammed emulsion gel polymer template to form a metal shell with a defined internal surface area, allowing independent tuning of pore diameter and active material thickness for enhanced electrochemical performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If conventional foam architecture with large pore sizes (0.25 mm) is used, then electrode structure is simple to manufacture, but ion and electron transport pathways become long, limiting power density
Solution Approach 1:
The electrode structure is segmented into multiple functional layers with controlled pore sizes. The spinodal decomposition process creates a bicontinuous structure with characteristic length scales that segment the transport pathways into shorter segments, reducing overall transport distance while maintaining structural integrity and manufacturability
Solution Approach 2:
The pore size parameter is changed from conventional large sizes (0.25 mm) to controlled smaller sizes through spinodal decomposition. By adjusting processing parameters such as cooling rate and composition, the characteristic length scale of the bicontinuous structure can be tuned to optimize transport pathways while maintaining ease of manufacture
2Ease of manufacture
If slurry addition method is used to deposit active material on foam, then deposition process is simple, but percolating pathway for electrolyte is blocked, reducing power delivery
Solution Approach 1:
The pore structure is preliminarily designed through spinodal decomposition to ensure percolating pathways are maintained before active material deposition. The bicontinuous structure creates interconnected channels that preserve electrolyte access, allowing subsequent deposition processes to proceed without blocking transport pathways
Solution Approach 2:
The electrode utilizes a porous bicontinuous structure created by spinodal decomposition, where the interconnected pore network maintains percolating pathways for electrolyte transport. This porous architecture allows active material to be deposited while preserving channels for ion transport, enabling both simple deposition and high power delivery
3Ease of manufacture
If non-uniform pore distribution is used in conventional electrodes, then manufacturing is easier, but transport resistance increases, limiting energy and power density
Solution Approach 1:
The spinodal decomposition process inherently produces a homogeneous pore distribution with uniform characteristic length scales throughout the electrode. This self-organizing mechanism creates a uniform bicontinuous structure without requiring complex manufacturing steps, achieving both manufacturing ease and reduced transport resistance through homogeneous pore architecture
4Quantity of substance
If thicker electrodes are used to increase energy storage, then energy density improves, but transport pathways become longer, reducing power delivery
Solution Approach 1:
The bicontinuous structure introduces a three-dimensional interconnected pore network that provides multiple transport pathways through the electrode thickness. This dimensional approach allows thicker electrodes to maintain short effective transport distances by utilizing vertical and lateral channels, enabling increased energy storage without sacrificing power delivery
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
This approach enables efficient ion and electron transport, achieving high power and energy densities, bridging the gap between batteries and supercapacitors, with improved electrochemical performance and cost-effectiveness by allowing thicker electrodes and more efficient active material deposition.
Implementation Method 1
arrested phase separation of a binary liquid mixture undergoing spinodal decomposition
Data Source
AI summary
Electrodes and methods of creating co-continuous composite electrodes based on a highly porous current collector are provided. In one embodiment, a method for creating an electrode includes depositing a thin layer of material on the polymer template, removing polymer material of the polymer template and depositing a second material. The method may also include controlling internal surface area per unit volume and the active material thickness of at least the second material to tune the electrochemical performance of the electrode. In one embodiment, a composite electrode is provided including interpenetrating phases of a metal current collector, electrolytically active phase, and electrolyte.