Electrode Ion Conduction Channels via High Aspect Ratio Components
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Solution Overview
Problem
Composite electrodes in electrochemical cells, such as lithium-ion batteries, face challenges with high tortuosity due to calendering, which hinders rapid mass transport of lithium ions, leading to poor power performance during charging and discharging.
Innovation Solution
Incorporating high aspect ratio (HAR) material components into the electrode layers, oriented either vertically or non-aligned with respect to the current collector, to create conduction channels that facilitate ion transport and access to active material particles, thereby enhancing ion conductivity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If calendering is applied to composite electrodes to increase density, then energy density is improved, but tortuosity increases which hinders ion transport
Solution Approach 1:
The patent introduces high aspect ratio porous components (such as hollow fibers, microporous rods, or tubular structures) into the electrode composite. These porous components create dedicated ion conduction channels that maintain low tortuosity even after calendering, allowing ions to transport efficiently through the dense electrode structure without being hindered by the increased tortuosity from calendering compression.
Solution Approach 2:
The patent creates a composite electrode structure combining traditional active material particles with high aspect ratio porous components. This composite approach allows the electrode to simultaneously achieve high density from calendering while maintaining ion transport pathways through the porous components, resolving the contradiction between energy density and ion transport rate.
2Quantity of substance
If electrode layers are made thicker to increase capacity, then energy capacity is improved, but ion access to active material particles is reduced
Solution Approach 1:
The patent incorporates three-dimensional high aspect ratio porous components (such as vertical hollow fibers or elongated tubular structures) that extend through the electrode thickness. These components create vertical ion conduction channels that provide direct pathways from the electrolyte to active material particles deep within thick electrode layers, enabling rapid ion access without requiring thin electrodes.
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 use of HAR components in the electrodes improves ion conductivity and access, leading to faster ion transport and increased utilization of active material particles, thus enhancing the power performance of electrochemical cells.
Implementation Method 1
the high aspect ratio components are ionically conductive and are configured to provide ion conduction channels through the second electrode layer
Implementation Method 2
applying a magnetic field to the second electrode layer, thereby aligning the plurality of first high aspect ratio components
Data Source
AI summary
An electrode including conduction channels includes at least one electrode layer layered onto a current collector, the electrode layer including a plurality of active material particles and a plurality of high aspect ratio components. The high aspect ratio components are configured to provide ion conduction channels through the electrode layer. In some examples, the electrode may include two or more electrode layers, at least one of which includes high aspect ratio components. In some examples, the high aspect ratio components may be oriented transverse to the current collector to provide ion transport through a first electrode layer to a second electrode layer.