Silicon Monoxide Electrode Wrinkle Prevention via Pressure-Assisted Formation
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Solution Overview
Problem
Existing methods for producing silicon monoxide electrodes in battery cells result in wrinkled electrodes, leading to poor electrical performance due to increased distance between electrodes, which prolongs the battery cell production time and reduces energy density.
Innovation Solution
A combined preformation and formation process where a solid electrolyte interface is formed simultaneously with the initial charging cycles of the battery cell, while applying pressure to ensure flat electrodes, significantly reducing production time and improving electrode proximity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If separate preformation and formation steps are used to produce silicon monoxide electrodes, then the solid electrolyte interface can be properly formed, but the production time is prolonged and electrode wrinkling occurs
Solution Approach 1:
The patent combines the preformation step (solid electrolyte interface formation) and the formation step (initial charging cycles) into a single integrated process. By applying pressure during the formation step, the electrode remains flat while the solid electrolyte interface forms simultaneously with lithium insertion. This eliminates the need for separate preformation and formation steps, reducing production time while maintaining electrode flatness and preventing wrinkling.
2Length of moving object
If pressure is applied during formation to ensure flat electrodes, then electrode proximity is improved, but the process complexity increases
Solution Approach 1:
The patent applies pressure to the battery cell during the formation step before the electrodes fully expand and before wrinkling can occur. This preliminary application of pressure maintains electrode flatness and ensures good electrode proximity from the beginning of the formation process. The pressure is applied continuously or intermittently during the initial charging cycles, preventing electrode deformation rather than attempting to correct it afterward.
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 process results in faster production of high-quality battery cells with improved electrical properties, such as higher current output and better discharge capacity retention, by ensuring flat electrodes with good proximity, thus enhancing energy density.
Implementation Method 1
forming a solid electrolyte interface on a silicon monoxide electrode in a battery cell and, while the solid electrolyte interface is being formed on the silicon monoxide electrode, charging the battery cell for one or more initial cycles
Data Source
AI summary
A solid electrolyte interface is formed on a silicon monoxide electrode in a battery cell. While the solid electrolyte interface is being formed on the silicon monoxide electrode, the battery cell is charged for one or more initial cycles.