Embedded Electrode Assembly With Porous CCPN for Dendrite Control
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Solution Overview
Problem
Current energy storage devices, such as batteries and capacitors, face limitations in energy density, charge/discharge rates, and safety issues due to dendrite formation and poor ion conductivity, particularly in lithium-ion batteries, which hinder their practical application and longevity.
Innovation Solution
The embedded electrode assembly (EMELA) features a porous conductive substrate with a continuous conductive particle network and a non-electrically conductive separator layer, reducing ion diffusion distances and enhancing surface area, thereby minimizing dendrite formation and improving ionic conductivity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If lithium ion batteries use high surface area electrodes to improve energy density, then energy storage capacity increases, but dendrite formation occurs leading to safety hazards and reduced reliability
Solution Approach 1:
The patent segments the electrode structure into numerous small pores (nanoscale to microscale) distributed throughout the electrode material. This segmentation increases the effective surface area for ion attachment while maintaining small diffusion distances, preventing dendrite formation by distributing current density across many small sites rather than a few large ones.
Solution Approach 2:
The patent creates local quality variations by forming pores with specific size distributions and spatial arrangements within the electrode. The pore structure provides localized regions with optimized properties for ion transport and attachment, ensuring uniform current distribution and preventing localized dendrite growth while maintaining high overall energy density.
2Productivity
If lithium ion batteries increase charging rate to improve productivity, then charge speed increases, but dendrite formation accelerates causing safety issues and reduced cycle life
Solution Approach 1:
The segmented pore structure divides the charging current into numerous parallel pathways through the pore network. This segmentation allows high charging rates to be achieved without exceeding critical current density thresholds at any single location, preventing dendrite formation even during rapid charging operations.
Solution Approach 2:
The patent transitions from planar electrode geometry to a three-dimensional pore network structure. This dimensional change provides additional pathways for ion transport and distributes current across multiple spatial dimensions, enabling fast charging while maintaining uniform current distribution and preventing dendrite formation.
3Quantity of substance
If capacitor electrode distance is reduced to improve energy density, then charge capacity increases, but electric field magnitude decreases reducing stored charge
Solution Approach 1:
The patent moves from a planar parallel-plate capacitor geometry to a three-dimensional pore-filled electrode structure. This dimensional change allows the electrodes to be positioned very close together (filling the gap with porous material) while maintaining high electric field strength through the pore walls, thereby increasing charge capacity without sacrificing field magnitude.
Solution Approach 2:
The use of porous electrode material allows the electrodes to be separated only by the thickness of the porous layer rather than a large gap. The porous structure provides high surface area for charge storage while maintaining small electrode separation distance, and the pore walls sustain the electric field throughout the material volume.
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 EMELA achieves 10-50 times more energy storage density, 100-2000 times faster charging rates, and 10-100 times longer life cycles by reducing ion current density and enhancing ion conductivity, addressing the limitations of conventional energy storage devices.
Implementation Method 1
reducing ion diffusion distances and enhancing surface area, thereby minimizing dendrite formation and improving ionic conductivity
Implementation Method 2
a continuous conductive particle network (CCPN) comprising a plurality of conductive particles, wherein the conductive particles are dispersed within the pores of the porous conductive substrate
Data Source
AI summary
An embedded electrode assembly (EMELA), comprising a substrate capable of conducting or storing a charge, wherein said substrate comprises one of a plurality of pores, a network of interconnected empty volumes, or an array of a plurality of pores extending into the substrate and a continuous conductive particle network (CCPN) comprising a plurality of conductive particles, wherein the conductive particles are dispersed within the pores or the interconnected empty volumes of the substrate.