Hydrogel Binder Free-Standing Electrode Without Metal Collectors
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Solution Overview
Problem
Conventional lithium-ion batteries (LIBs) and lithium-sulfur batteries (LSBs) face limitations due to heavy metal current collectors that reduce energy density and are prone to corrosion, while 3D carbon-based free-standing electrodes offer higher energy density but require costly and laborious preparation methods.
Innovation Solution
A hydrogel binder composed of an anionic polyacid and a cationic polyamine, derived from an acid-base reaction, is used to create a free-standing electrode with carbon nanotubes, eliminating the need for metallic current collectors and simplifying the production process.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If metal current collectors are used to provide mechanical support and electrical connection, then the electrode structure is stable and electrical contact is ensured, but the battery energy density decreases and corrosion resistance is poor
Solution Approach 1:
The patent removes the metal current collector component entirely from the electrode structure, replacing it with a self-supported carbon-based free-standing electrode. This extraction eliminates the harmful effects of metal collectors (weight, corrosion) while maintaining the essential functions of mechanical support and electrical conductivity through the carbon matrix and conductive additives.
Solution Approach 2:
The patent employs a composite material system consisting of carbon-based materials (graphene, carbon nanotubes, carbon cloth) combined with conductive additives and binder materials. This composite structure provides both mechanical integrity and electrical conductivity without requiring metal current collectors, thereby improving energy density while maintaining reliability.
2Reliability
If conventional preparation methods for carbon-based free-standing electrodes are used, then corrosion resistance and energy density are improved, but manufacturing complexity and cost increase significantly
Solution Approach 1:
The patent modifies the preparation approach by using simple slurry coating techniques with controlled drying parameters instead of complex processes like CVD or hydrothermal synthesis. By adjusting slurry composition, coating thickness, and drying conditions, the patent achieves high-quality carbon-based free-standing electrodes using equipment and methods suitable for large-scale production.
Solution Approach 2:
The patent replaces expensive, specialized equipment and labor-intensive processes with simpler, more economical preparation methods. The slurry coating technique uses basic coating equipment and can be performed with minimal specialized training, making the process suitable for cost-effective large-scale manufacturing while maintaining product quality.
3Ease of manufacture
If slurry coating method is used to prepare free-standing electrodes, then manufacturing simplicity is improved, but electrode versatility and performance are limited
Solution Approach 1:
The patent develops a universal slurry coating methodology that can accommodate various carbon-based materials (graphene, carbon nanotubes, carbon cloth) and different active materials. The slurry formulation and processing parameters can be adjusted to prepare electrodes for different battery chemistries and applications, making the method highly versatile despite its simplicity.
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 hydrogel binder effectively disperses active electrode materials and conductive additives, enhancing energy density and cycling stability, and allows for the production of free-standing electrodes without specialized equipment, thus overcoming the limitations of traditional methods.
Implementation Method 1
the anionic polyacid and the cationic polyamine are derived from an acid-base reaction between a polyacid and a polyamine
Data Source
AI summary
There is provided a hydrogel binder and a method of synthesizing the same. There is also provided a free-standing electrode comprising the hydrogel binder and a method of preparing the free-standing electrode comprising the hydrogel binder. There is further provided a battery comprising the free-standing electrode as defined herein.