Symmetric Reference Electrodes for Solid-State Battery Signal Stability
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Solution Overview
Problem
Existing all-solid-state batteries face challenges in accurately measuring and analyzing internal resistance due to instability and distortion of electrochemical signals, particularly caused by poor contact between solid electrolytes and reference electrodes, leading to unreliable detection of battery states.
Innovation Solution
The use of symmetrically arranged reference electrodes, electrically isolated from each other, which are inserted into the battery without a conductive paste, allowing for stable signal acquisition by ensuring even interface formation between the solid electrolyte and the reference electrodes, and enabling long-term operation even if one electrode becomes contaminated.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If reference electrodes are inserted into the all-solid-state battery, then electrochemical signal measurement is enabled, but contact between solid electrolyte and reference electrode is poor leading to signal instability and distortion
Solution Approach 1:
A conductive paste is introduced as an intermediary material between the solid electrolyte and the reference electrode. This conductive paste improves the contact interface, enabling stable electrochemical signal measurement by facilitating electrical connection while maintaining the solid-state battery structure.
Solution Approach 2:
The contact interface parameters between the reference electrode and solid electrolyte are modified by applying conductive paste and controlling insertion depth. This changes the electrical contact properties, transforming the poor contact interface into a reliable measurement interface that stabilizes the electrochemical signal.
2Reliability
If multiple reference electrodes are used for stable measurement, then signal reliability improves, but device complexity increases
Solution Approach 1:
Reference electrodes are positioned asymmetrically at specific locations within the battery structure, optimized for measurement reliability. This asymmetric arrangement places electrodes where they can best detect electrochemical signals without requiring symmetric complexity throughout the entire device.
Solution Approach 2:
The reference electrodes serve multiple functions: they provide electrochemical signal measurement, enable internal resistance measurement, and facilitate battery state determination. This multi-functionality reduces the need for separate measurement systems, thereby limiting the increase in device complexity.
3Ease of operation
If reference electrodes are inserted during manufacturing, then measurement capability is achieved, but manufacturing precision is compromised due to non-uniform pressure
Solution Approach 1:
The reference electrodes are inserted into predetermined positions within the battery structure before final assembly and pressing. This preliminary positioning ensures that electrodes are correctly located before the pressing operation, preventing displacement and ensuring manufacturing precision is maintained.
Solution Approach 2:
The conductive paste acts as a mediator that is applied to the reference electrode insertion sites before final pressing. This paste fills gaps and ensures uniform pressure distribution during the manufacturing process, preventing non-uniform pressure effects while maintaining electrode positioning accuracy.
Data Source
AI summary
Disclosed are an all-solid-state battery including symmetrically arranged reference electrodes, a device for manufacturing the same, and a method of manufacturing using same.