Perforated Silicon-Anode Electrodes for Longer Battery Cycle Life
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Solution Overview
Problem
Conventional battery electrodes are costly, cumbersome, and inefficient, limiting battery lifetime and energy density, particularly in silicon-dominant anode cells where large volume changes during lithiation and delithiation lead to electrical isolation and capacity loss.
Innovation Solution
The use of perforated anodes and cathodes in silicon-dominant anode cells, where the current collectors and active materials are perforated to allow lithium flow and reduce mechanical stress, thereby enhancing energy density and cycle life.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional solid electrodes are used in silicon-dominant anode cells, then manufacturing is simpler, but electrical isolation and capacity loss occur due to large volume changes during lithiation and delithiation
Solution Approach 1:
The patent applies porous materials by using perforated electrodes with through-holes that allow electrolyte penetration. The porous structure enables lithium ions to access the active material from multiple directions, accommodating volume changes during lithiation/delithiation cycles while maintaining electrical contact and preventing isolation, thus improving battery lifetime without excessive complexity
Solution Approach 2:
The patent applies segmentation by dividing the solid electrode into perforated segments with through-holes. This segmentation creates multiple access paths for lithium ions and allows different regions of the electrode to expand and contract independently during cycling, preventing mechanical stress concentration and electrical isolation while maintaining structural integrity
2Quantity of substance
If silicon-dominant anode material is used, then energy density increases, but volume changes during lithiation and delithiation cause electrical isolation and capacity loss
Solution Approach 1:
The perforated electrode structure provides porous pathways that accommodate the large volume changes of silicon during lithiation/delithiation. The through-holes allow electrolyte flow and lithium ion transport throughout the electrode, maintaining electrical contact with silicon particles even during expansion/contraction cycles, thus preserving both high energy density and long cycle life
Solution Approach 2:
The patent introduces another dimension by creating three-dimensional perforated pathways through the electrode. Instead of relying on planar lithium ion transport, the through-holes enable vertical and radial access to active material, accommodating silicon's volumetric expansion in multiple directions while maintaining electrical connectivity and preventing isolation
3Productivity
If conventional electrodes are used, then manufacturing is easier, but battery capacity and cycle life are limited
Solution Approach 1:
The perforated electrode design uses porous structures with controlled through-holes that can be integrated into existing manufacturing processes. The porous architecture increases effective surface area and electrolyte contact, boosting cell capacity while the fabrication methods described maintain compatibility with standard electrode manufacturing techniques
Solution Approach 2:
The perforated electrode structure serves multiple functions simultaneously: it provides mechanical support, enables lithium ion transport, facilitates electrolyte distribution, and accommodates volume changes. This multi-functionality increases cell capacity and cycle life while avoiding the need for separate components, maintaining ease of manufacture
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 implementation of perforated electrodes significantly increases cell capacity and retains more than 80% capacity out to 250 cycles, improving the energy density and cycle life of lithium-ion batteries.
Implementation Method 1
allow lithium flow through the perforated structure
Implementation Method 2
reduce mechanical stress during lithiation and delithiation
Data Source
AI summary
Systems and methods for use of perforated anodes in silicon-dominant anode cells may include a cathode, an electrolyte, and an anode, where the cathode and anode each comprise an active material on a current collector. One or both of the current collector and active material may be perforated. For example, the current collector may be perforated and/or both the current collector and active material may be perforated. The battery may comprise a stack of anodes and cathodes. Each cathode of the stack may be perforated and/or each anode of the stack may be perforated. Each cathode of the stack may comprise two layers of active material on each side of the cathode where a first of the two layers of active material may be for prelithiation of anodes of the battery. A second of the two layers may be for lithium cycling of the battery.