Thermal Rod Heating of Electrode Rolls for Uniform Pyrolysis
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Solution Overview
Problem
Conventional battery technologies are costly, cumbersome, and inefficient, limiting battery lifetime and performance, particularly in lithium-ion batteries due to issues with silicon-based anodes that experience large volume changes during charge-discharge cycles, leading to capacity loss and electrical isolation.
Innovation Solution
The implementation of controlled thermal transfer during electrode pyrolysis processing using a thermal rod and electrode roll combination, which allows for uniform heating and cooling, enhancing the processing quality of silicon-dominant anodes by maintaining electrical contact and reducing solid electrolyte interphase formation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If conventional battery electrode processing methods are used, then manufacturing cost is reduced, but manufacturing precision and electrode quality deteriorate due to non-uniform thermal transfer during pyrolysis
Solution Approach 1:
The processing system is segmented into multiple independent thermal rods that can be individually controlled, allowing localized temperature management across different zones of the electrode roll. This segmentation enables precise thermal control without requiring a completely complex integrated system.
Solution Approach 2:
A thermal rod acts as an intermediary between the heat source and the electrode material, enabling controlled thermal transfer during pyrolysis. The thermal rod mediates the heating process to achieve uniform temperature distribution while maintaining system simplicity.
2Quantity of substance
If silicon-based anodes are used to increase energy density, then battery capacity is improved, but reliability deteriorates due to large volume changes causing electrical isolation and capacity loss
Solution Approach 1:
The pyrolysis temperature parameters are precisely controlled and optimized to transform the binder material into a flexible carbon matrix. This parameter control ensures the carbon structure can accommodate silicon's volume changes while maintaining electrical conductivity, thus preserving reliability.
Solution Approach 2:
The anode is constructed as a composite material system combining silicon particles with a pyrolyzed carbon-containing binder matrix. The carbon matrix provides structural stability and electrical conductivity that compensates for silicon's volume expansion and contraction, maintaining both capacity and reliability.
3Productivity
If rapid pyrolysis processing is applied to improve productivity, then processing speed is increased, but manufacturing precision deteriorates due to non-uniform heating and cooling
Solution Approach 1:
The thermal processing system is divided into multiple independently controllable thermal rods positioned at different locations. This allows simultaneous heating of multiple zones at optimized rates, maintaining thermal uniformity while achieving high processing speeds through parallel operation.
Solution Approach 2:
The pyrolysis process maintains continuous and uniform thermal action through coordinated operation of multiple thermal rods. The system ensures continuous heat supply at controlled rates throughout the processing cycle, preventing thermal gradients that would compromise precision while sustaining high productivity.
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
This approach improves the cycle life and energy density of lithium-ion batteries by maintaining electrical contact and reducing impedance, thereby enhancing the performance and reliability of silicon-based anodes.
Implementation Method 1
providing controlled thermal transfer into the electrode roll during processing of the electrode roll
Implementation Method 2
processing of the electrode roll, with the processing comprising pyrolysis processing of the electrode roll
Data Source
AI summary
Systems and methods are provided for control of thermal transfer during electrode pyrolysis based processing. An apparatus for processing battery electrodes may include a core configured for use in forming an electrode roll and a thermal rod. The core is configured to engage a sheet including electrode material applied on a current collector, specifically by rolling the sheet on the core to create concentric alternating layers of electrode material and current collector around an internal space formed by the core. The thermal rod is configured for engaging the electrode roll via the internal space of the core such that, once engaged, at least a portion of the thermal rod is disposed within the concentric alternating layers of electrode material and current collector. The thermal rod is configured to provide thermal transfer into the electrode roll via the core during processing of the electrode roll, with the processing including applying pyrolysis.