3D Architected Pyrolyzed Electrodes for Battery Mechanical Strength
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Solution Overview
Problem
Conventional electrode structures for batteries face challenges such as scalability, mechanical resilience, tortuosity, effective active materials fraction, and range of controllable form-factors, particularly in achieving a balance between strength, density, and stiffness while maintaining thermal stability and electrical conductivity.
Innovation Solution
Development of porous and three-dimensional electrodes with nano- and micro-architected geometries comprising high percentages of active carbon allotrope materials, fabricated using additive manufacturing and pyrolysis processes, which offer tunable and controllable properties like high strength, deformability, and low density.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If conventional slurry electrode structure is used, then ease of manufacture is improved, but mechanical strength and structural resilience deteriorate
Solution Approach 1:
The patent employs porous three-dimensional architected structures made from carbonized polymer precursors. These porous materials provide both mechanical strength and electrolyte penetration pathways, resolving the contradiction between structural integrity and ease of manufacture by replacing conventional slurry coatings with architecturally controlled porous frameworks that can be manufactured through additive processes.
Solution Approach 2:
The electrode structure utilizes composite materials consisting of carbonized polymer frameworks combined with active electrode materials. This composite approach enables the structure to simultaneously achieve enhanced mechanical strength from the carbonized framework and electrochemical functionality from the active materials, while maintaining manufacturability through integrated fabrication processes.
2Quantity of substance
If electrode thickness is increased to improve volumetric energy density, then active materials fraction is improved, but tortuosity increases and power density deteriorates
Solution Approach 1:
The patent transitions from two-dimensional planar electrodes to three-dimensional architected structures. This dimensional change enables increased active materials volume fraction while maintaining low tortuosity through vertically oriented channels and pores that provide direct ion transport pathways from the electrolyte to active materials throughout the electrode thickness, thereby improving both energy density and power density simultaneously.
Solution Approach 2:
The three-dimensional architected electrodes incorporate controlled porosity with interconnected pores and channels that facilitate rapid ion diffusion. The porous structure allows ions to access active materials efficiently throughout the electrode volume, resolving the contradiction between increasing active materials fraction and maintaining fast ion transport speeds.
3Speed
If porous structure is created to improve ion diffusion, then effective active materials fraction is improved, but mechanical strength deteriorates
Solution Approach 1:
The electrode employs a composite structure where a carbonized polymer framework provides mechanical strength and structural integrity, while the porous architecture within this framework enables rapid ion diffusion. The composite nature allows simultaneous achievement of mechanical strength and fast ion transport by distributing structural support and transport functions across different structural elements.
Solution Approach 2:
The patent utilizes porous three-dimensional architected structures where the pore walls and framework elements provide mechanical strength while the interconnected pores facilitate ion diffusion. The porous material design ensures that structural integrity is maintained through the framework architecture while ion transport pathways are preserved through the pore network.
4Productivity
If conventional additive manufacturing is used for electrode fabrication, then scalability is improved, but mechanical strength and stiffness deteriorate due to ultra-lightweight design
Solution Approach 1:
The patent utilizes parameter changes through thermal processing (carbonization/pyrolysis) to transform the mechanical properties of the electrode structure. The thermal treatment converts the polymer framework into a carbonized structure with enhanced mechanical strength and stiffness, while maintaining the three-dimensional architected geometry fabricated through additive manufacturing, thus resolving the contradiction between scalability and mechanical strength.
Solution Approach 2:
The electrode fabrication employs phase transition through carbonization of polymer precursors during thermal processing. This phase transition transforms the material from a soft polymer state to a rigid carbonized state with superior mechanical properties, enabling the additive-manufactured structure to achieve both scalability and enhanced mechanical strength simultaneously.
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 electrodes exhibit enhanced mechanical resilience, high specific strength, and low density, improving the performance of electrochemical cells by overcoming the limitations of conventional electrodes in terms of scalability and form-factor control.
Implementation Method 1
The electrodes described herein may comprise one or more carbon allotrope materials
Data Source
AI summary
In an aspect, an electrode for an electrochemical cell comprises: a structure having a nano- or micro-architected three-dimensional geometry; said structure comprising one or more active carbon allotrope materials; wherein said structure is characterized by an average density less than or equal to 2.3 g cm−3 and an average specific strength (strength-to-density ratio) greater than or equal to 0.004 GPa g−1 cm3. Also disclosed herein are methods for making an electrode for an electrochemical cell, and methods for making an electrochemical cell.