Gradient-Porosity Battery Electrode for Ion Access and Capacity
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Solution Overview
Problem
Existing electrochemical batteries face challenges in optimizing electrode porosity distribution, leading to inefficiencies in energy storage and performance.
Innovation Solution
The electrode design incorporates a porosity gradient that varies continuously across its surface, allowing for a structured distribution of porosity to enhance energy storage and performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If uniform porosity is used in the electrode, then manufacturing is simple, but energy storage capacity and performance are suboptimal
Solution Approach 1:
The electrode employs a porosity gradient structure where porosity varies continuously from a first value at the current collector interface to a second value at the electrolyte interface. This local variation optimizes different regions for different functions: higher porosity near the current collector enhances active material distribution and electron transport, while controlled porosity near the electrolyte interface facilitates ion access. This resolves the contradiction by achieving superior energy storage capacity through spatially differentiated porosity while maintaining a manufacturable gradient structure.
Solution Approach 2:
The patent implements continuous parameter change by varying porosity as a gradient across the electrode thickness rather than maintaining a uniform value. The porosity transitions smoothly from one interface to the other, creating optimized zones for different electrochemical processes. This parameter variation enables enhanced energy storage and performance while the gradient approach remains compatible with existing manufacturing techniques, thus resolving the contradiction between performance optimization and structural complexity.
2Productivity
If porosity is increased to improve electrolyte access, then ion transport is enhanced, but active material density decreases
Solution Approach 1:
The porosity gradient structure applies local quality optimization by assigning different porosity values to different regions of the electrode. Near the electrolyte interface, higher porosity facilitates enhanced ion transport and electrolyte penetration. Near the current collector interface, lower porosity maintains higher active material density for efficient electron transport and capacity. This spatial differentiation resolves the contradiction by allowing high ion transport efficiency in regions where it is most needed while preserving active material density in regions where capacity is prioritized.
3Reliability
If porosity gradient is implemented to optimize performance, then energy storage and efficiency improve, but manufacturing complexity increases
Solution Approach 1:
The patent achieves performance optimization through continuous parameter change, specifically a porosity gradient that transitions smoothly across the electrode thickness. This gradient structure improves reliability and performance stability by ensuring optimal conditions throughout the electrode volume rather than at discrete points. The gradient can be manufactured using modified slurry preparation and coating techniques that are extensions of existing processes, making the implementation feasible despite the increased manufacturing complexity.
Solution Approach 2:
The porosity gradient can be implemented through segmentation of the electrode into multiple layers or zones during manufacturing, each with controlled porosity characteristics. This segmentation approach allows for systematic control of the gradient while using established manufacturing techniques for each layer, thereby reducing the overall manufacturing complexity compared to attempting to create a continuous gradient in a single step.
Data Source
AI summary
A battery including a housing; an electrolyte disposed in the housing; and a first electrode, wherein a porosity of the first electrode varies across a surface of the first electrode. A method includes obtaining a first electrode having a first predetermined porosity, obtaining a second electrode having a second predetermined porosity, wherein the second predetermined porosity is different than the first predetermined porosity, and laminating the first electrode with the second electrode, thereby to provide for an interface free electrode structure with a porosity gradient.