Paste Electrodes With Porous Conductive Networks for Thick-Cell Power
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Solution Overview
Problem
Current batteries face limitations in power, energy density, and cycle life due to their electro-ionic mechanism, while supercapacitors offer higher power but lower energy density, and both types of devices have inefficiencies in electrode design leading to suboptimal performance and increased mass and volume.
Innovation Solution
The development of electrical energy storage devices with thick paste electrodes composed of conductive additives and carbon micro/nanoparticles, combined with nanosized redox active elements, which act as both an efficient electrical conductivity network and supercapacitor electroactive material, allowing for improved energy density, power, and cycle life by facilitating ion access and reducing material thickness requirements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If thick electrodes are used to increase energy density, then the amount of active material per volume increases, but power and cycle life deteriorate due to poor ion transport
Solution Approach 1:
The electrode is designed as a porous paste structure with interconnected pores that allow electrolyte penetration throughout the entire thickness. This porous architecture enables ions to access active material particles deep within thick electrodes, maintaining high power while achieving high energy density through increased active material loading.
Solution Approach 2:
The electrode is segmented into a three-phase composite structure consisting of active material particles, conductive additive network, and electrolyte-filled pores. This segmentation allows each component to perform its optimal function: active material for energy storage, conductive network for electron transport, and electrolyte for ion transport, resolving the contradiction between thickness and performance.
2Quantity of substance
If thick electrodes are used to increase energy density, then the amount of active material per volume increases, but cycle life deteriorates due to poor ion transport
Solution Approach 1:
The porous paste structure with electrolyte-filled pores ensures efficient ion transport pathways throughout the thick electrode, enabling rapid ion diffusion during charge-discharge cycles. This maintains low internal resistance and uniform current distribution over thousands of cycles, achieving both high energy density and long cycle life.
Solution Approach 2:
The electrode uses a composite paste formulation combining active material, conductive additives, and binder in optimized ratios. This composite structure provides mechanical integrity for thick electrodes while maintaining electrical conductivity and ionic accessibility, ensuring long-term cycling stability despite increased thickness.
3Power
If thin coatings are used to improve power and cycle life, then ion transport is efficient, but energy density decreases due to small active material volume
Solution Approach 1:
The porous paste structure allows the electrode to achieve both thin-film performance and thick-electrode capacity. The interconnected pore network ensures that even in thin electrodes, ions can rapidly access all active material, maintaining high power. Simultaneously, the structure allows increased loading density to achieve high energy density without sacrificing power.
Solution Approach 2:
The invention changes the structural parameters of the electrode from dense solid coating to porous paste structure. This parameter change increases the effective surface area and ion accessibility, allowing the electrode to achieve high energy density with increased active material volume while maintaining high power through efficient ion transport pathways.
4Manufacturing precision
If conventional solid electrodes are used, then fabrication is precise, but manufacturing complexity increases due to coating and drying processes
Solution Approach 1:
The electrode is fabricated as a castable paste slurry that is poured or pumped into the electrode holder and then dried. This hydraulic approach replaces complex coating equipment with simple pouring and drying processes, reducing manufacturing complexity while maintaining consistent thickness through controlled casting.
Solution Approach 2:
The paste formulation is designed to self-level and self-densify during the casting and drying process. The viscosity and rheology of the paste are optimized to automatically distribute evenly and form a uniform layer without requiring precision coating equipment, simplifying manufacturing while ensuring consistent quality.
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 use of thick paste electrodes with hybrid materials enhances energy density, power, and cycle life, achieving performance comparable to commercial batteries while minimizing material thickness and maximizing active material usage, and maintains high power and cycle life through efficient electron flow and redox processes.
Implementation Method 1
carbon micro/nanoparticles which acts as both: highly efficient electrical conductivity network
Implementation Method 2
ion diffusion though the electrolyte and the active material as in batteries
Implementation Method 3
Nanosized redox active elements added to the carbon particles to get a hybrid material with hybrid electrochemical performance
Implementation Method 4
the storing mechanism lies just on the electrode's surface through the formation of an electric double layer
Data Source
Figure 1
Figure 2
Figure 3A~3B
AI summary
The present invention relates to an electrical energy storage device including at least one electrical energy storage unit comprising two electrodes, one being an anode (6.3a) and the other being a cathode (6.3b), wherein the electrodes are based on an electroactive paste comprising carbon micro/nanoparticles (3.4) dispersed in an electrolyte, which, under pressure, provide a highly efficient electrical conductivity network though all the paste and, at the same time, act as a supercapacitor, and nanosized redox active elements (4.6) added to the carbon micro and nanoparticles (4.4) and an electrolyte (3.2 and 4.2); and a structure that applies a given degree of mechanical pressure to the electroactive paste.