Monolithic Carbon Electrodes With Cavities for Higher Battery Capacity
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Solution Overview
Problem
Conventional lithium-ion battery electrodes face challenges in deformability, requiring metal foil current collectors for mechanical support, which limits their capacity, increases irreversible capacity, and complicates manufacturing, while also restricting the use of non-rollable electrode materials.
Innovation Solution
The development of self-supported, monolithic carbon electrodes with engineered cavities and a conductive carbon matrix that eliminates the need for metal foil current collectors, utilizing pyrolyzed carbonized polymers as both active material and current collector, and incorporating silicon for enhanced performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If metal foil current collectors are used to provide mechanical support to electrode materials, then the structural stability and deformability of the electrode are improved, but the battery capacity is reduced due to inactive material content and increased irreversible capacity
Solution Approach 1:
The invention extracts and eliminates the metal foil current collector from the electrode structure. The electrode is designed as a self-supported porous carbon structure where the carbon material itself provides both the active electrochemical function and the mechanical support, removing the inactive metal foil component that reduces capacity.
Solution Approach 2:
The porous carbon structure serves multiple functions simultaneously: it acts as the electrochemically active material, provides mechanical support and structural stability, enables electrolyte penetration, and facilitates ion transport. This multi-functionality eliminates the need for separate current collector components.
2Strength
If metal foil current collectors are used to support electrode materials, then the mechanical strength and handling capability are improved, but the manufacturing complexity and cost increase
Solution Approach 1:
The invention merges the structural support function and the electrochemical active material into a single integrated porous carbon structure. This eliminates the need for separate metal foil current collectors and reduces the number of manufacturing steps required to assemble the electrode components.
Solution Approach 2:
The electrode utilizes a porous carbon structure that inherently provides mechanical strength while maintaining high porosity for electrolyte access. The porous nature allows the material to be both structurally sound and electrochemically active without requiring additional support layers.
3Stability of the object's composition
If conventional electrode materials are used that require metal foil support, then the electrode can maintain structural integrity, but the surface area per unit volume is limited
Solution Approach 1:
The electrode employs a three-dimensional porous carbon structure with controlled pore sizes and high surface area-to-volume ratio. This porous architecture provides extensive surface area for electrochemical reactions while the interconnected framework maintains structural integrity without requiring metal foil support.
Solution Approach 2:
The invention transitions from conventional two-dimensional planar electrodes to a three-dimensional porous structure. This dimensional change dramatically increases the available surface area within the same volume while the porous framework provides the necessary mechanical strength.
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
These electrodes offer higher capacity, improved overcharge/discharge protection, reduced irreversible capacity, potential cost savings, and increased surface area per unit volume, enabling the use of non-rollable materials and simplifying manufacturing.
Implementation Method 1
utilizing pyrolyzed carbonized polymers as both active material and current collector
Data Source
AI summary
In certain embodiments, an electrode includes a body of material formed in substantial part of carbon, the body having an exterior surface and an interior located within the exterior surface, and a plurality cavities located in the interior of the body. Each of the cavities is in communication with the exterior of the body and has an interior surface. The cavities can each be sized to accommodate a battery separator located therein and substantially covering the interior surface of the cavity.