Reference Electrode Assembly Testing via Two-Electrode Voltammetry

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Solution Overview

Problem

Existing methods for evaluating reference electrode assemblies in electrochemical cells are inefficient and require the assembly of full electrochemical cells, which is costly and material-intensive.

Innovation Solution

A system and method using a two-electrode configuration to assess characteristics of reference electrode assemblies, including a test cell assembly with a current collector layer and a controller to generate cyclic voltammograms, allowing evaluation without assembling full electrochemical cells.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If full electrochemical cells are assembled for evaluation, then comprehensive testing of reference electrode assemblies is achieved, but cost and material consumption increase significantly

Engineering Contradiction:

Improveevaluation accuracyVSAvoidmaterial consumption

Core Design Contradiction:

ReliabilityVSQuantity of substance

Solution Approach 1:

The patent extracts the reference electrode assembly from the complete three-electrode electrochemical cell configuration and tests it independently in a simplified two-electrode setup. The reference electrode assembly is evaluated by itself against a lithium metal counter electrode, eliminating the need for working and counter electrodes required in full cell assembly. This extraction principle reduces material consumption while maintaining evaluation reliability.

Inventive Principle:

Principle #2Taking out (Extraction)

Solution Approach 2:

The evaluation process is segmented into separate independent tests for different components (current collector layer, separator layer, reference electrode layer) rather than requiring complete cell assembly. Each layer can be assessed individually through cyclic voltammetry measurements in the simplified configuration, reducing overall material requirements while maintaining comprehensive evaluation capability.

Inventive Principle:

Principle #1Segmentation

2Reliability

If full electrochemical cells are assembled for evaluation, then complete performance assessment is achieved, but time and resource efficiency decrease

Engineering Contradiction:

Improveevaluation completenessVSAvoidevaluation efficiency

Core Design Contradiction:

ReliabilityVSProductivity

Solution Approach 1:

The reference electrode assembly is extracted from the complex three-electrode cell configuration and tested in isolation using a simplified two-electrode setup. This extraction eliminates unnecessary components and streamlines the evaluation process, significantly improving productivity while maintaining the ability to assess all critical performance aspects including ionic permeability, compatibility, and electrochemical stability.

Inventive Principle:

Principle #2Taking out (Extraction)

Solution Approach 2:

The patent performs preliminary evaluation of the reference electrode assembly in a simplified configuration before committing to full cell assembly. This preliminary action allows rapid assessment of key parameters using minimal materials, enabling early identification of problematic assemblies and avoiding waste of time and resources on incomplete evaluations.

Inventive Principle:

Principle #10Preliminary action

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

Enables efficient and cost-effective assessment of reference electrode assemblies and their components, providing insights into ionic permeability, compatibility, and electrochemical stability without the need for a three-electrode configuration.

Implementation Method 1

The controller is configured to generate a test cell cyclic voltammogram by applying an electric potential between the electroactive layer and the lithium metal layer, cycling the applied electric potential between an initial potential and a set potential, and measuring the electric current at the electroactive layer as the applied electric potential is cycled

Methodology Applied

Scientific EffectCyclic voltammetry:

Implementation Method 2

The current collector layer is electrically isolated from the lithium metal layer by the separator layer... providing insights into ionic permeability

Methodology Applied

Scientific EffectIonic permeability: Permeation

Data Source

PatentUS12467900B2Systems and methods for assessing reference electrode assemblies for electrochemical cells

Publication Date: 2025.11.11 GM GLOBAL TECHNOLOGY OPERATIONS LLC

AI summary

A system for assessing a characteristic of a reference electrode assembly for an electrochemical cell that cycle lithium ions includes a controller and a test cell assembly. The test cell assembly includes a metal case electrically coupled to the controller and a test cell disposed within the metal case. The test cell includes a lithium metal layer and a separator assembly. The separator assembly includes a separator layer, a current collector layer deposited on the separator layer, and optionally an electroactive layer deposited on the separator layer such that the electroactive layer at least partially overlaps the current collector layer. The current collector layer is in direct physical contact with an electroactive layer and is electrically isolated from the lithium metal layer by the separator layer.