All-Solid-State Battery Electrode Stacking With Zigzag Electrolyte Sheet
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Solution Overview
Problem
The manufacturing of all-solid-state batteries is complicated due to difficulties in aligning and stacking electrodes, especially when using lithium metal as the negative electrode, which requires careful pressure application to avoid reaction and ensure safety, while also facing challenges with interfacial resistance and limited size due to pressurization methods.
Innovation Solution
A method involving compartmentalizing an all-solid-state electrolyte layer sheet to accommodate electrodes in a zigzag pattern, allowing for non-contact stacking and easy alignment, with the option of cutting the sheet to facilitate folding and pressurization, enabling simpler and more efficient electrode stacking.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If lithium metal is pressurized at high pressure to reduce interfacial resistance, then the performance of the unit cell is improved, but the lithium metal and solid electrolyte may react causing cell short
Solution Approach 1:
The patent divides the pressurization process into multiple stages: first pressurizing the solid electrolyte and positive electrode together, then separately pressurizing the negative electrode (lithium metal) in a second step. This segmentation prevents direct high-pressure contact between lithium metal and solid electrolyte, avoiding harmful reactions while still achieving low interfacial resistance for improved unit cell performance.
2Ease of manufacture
If the negative electrode, positive electrode, and solid electrolyte are pressurized at once, then the manufacturing process is simplified, but it is difficult to align the electrodes to be stacked
Solution Approach 1:
The patent segments the pressurization operation into distinct steps: Step 1 pressurizes the solid electrolyte and positive electrode assembly, while Step 2 separately pressurizes the negative electrode. This segmented approach allows each electrode to be positioned and aligned independently before final assembly, solving the alignment problem while maintaining manufacturing efficiency.
Solution Approach 2:
The patent performs preliminary positioning and alignment of electrodes before the pressurization steps. The solid electrolyte and positive electrode are first arranged and aligned, then the negative electrode is positioned separately. This preliminary action ensures proper alignment is achieved before pressure is applied, preventing misalignment issues.
3Reliability
If conventional pressurization methods are used, then the interfacial resistance is reduced, but the manufacturing process is complicated and time-consuming
Solution Approach 1:
The patent merges the pressurization of the solid electrolyte and positive electrode into a single operation in Step 1, and separately merges the negative electrode pressurization in Step 2. This combining approach reduces the total number of pressurization cycles compared to conventional methods, improving manufacturing efficiency while still achieving low interfacial resistance through the optimized two-step process.
Data Source
AI summary
The present disclosure relates to a method for manufacturing an all-solid-state battery, which has a simple manufacturing process, allows more electrodes to be stacked in a desired size, and facilitates alignment between electrodes.