Additive Medium for Electrochemical Cell Additive Replenishment

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Solution Overview

Problem

Electrochemical cells face efficiency and lifetime limitations due to the consumption of additives over time, leading to depleted concentrations that affect their performance.

Innovation Solution

An electrochemical cell system that includes an ionically conductive medium with active additives, where an additive medium is designed to corrode or dissolve, releasing the additives into the electrolyte to maintain optimal concentrations, using mechanisms like galvanic corrosion or soluble containers to control the release.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Productivity

If additives are added to enhance electrochemical reactions, then cell efficiency is improved, but additives are consumed over time leading to depleted concentrations and reduced lifetime

Engineering Contradiction:

Improvecell efficiencyVSAvoidcell lifetime

Core Design Contradiction:

ProductivityVSDuration of action of stationary object

Solution Approach 1:

The patent applies preliminary action by pre-loading the additive medium with additives before cell operation begins. The additive medium is prepared in advance with sufficient additive concentration to maintain optimal levels throughout cell operation, eliminating the need for external replenishment during cell lifetime.

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The additive medium serves itself by automatically releasing additives into the ionically conductive medium as they are depleted. The system self-regulates additive concentration through the corrodible/dissolvable casing mechanism, which releases additives in response to concentration depletion without external intervention, thereby extending cell lifetime while maintaining efficiency.

Inventive Principle:

Principle #25Self-service

2Duration of action of stationary object

If additive concentration is maintained to extend cell lifetime, then operational duration is improved, but requires an additional additive medium component

Engineering Contradiction:

Improvecell lifetimeVSAvoidsystem structure

Core Design Contradiction:

Duration of action of stationary objectVSDevice complexity

Solution Approach 1:

The patent merges the additive storage function with the additive delivery function into a single integrated additive medium component. The corrodible/dissolvable casing combines both containment and controlled release mechanisms, eliminating the need for separate storage and delivery systems and minimizing structural complexity.

Inventive Principle:

Principle #5Merging (Combining)

Solution Approach 2:

The corrodible/dissolvable casing acts as an intermediary between the additive reservoir and the ionically conductive medium. It mediates the controlled release of additives, translating the need for concentration maintenance into a simple structural design that automatically regulates additive transfer without complex control systems.

Inventive Principle:

Principle #24Intermediary (Mediator)

3Quantity of substance

If additive medium is designed to corrode or dissolve for additive release, then additive concentration is maintained, but the release rate must be precisely controlled

Engineering Contradiction:

Improveadditive concentrationVSAvoidrelease rate control

Core Design Contradiction:

Quantity of substanceVSManufacturing precision

Solution Approach 1:

The patent applies parameter changes by modifying the physical and chemical properties of the casing material to control additive release. By selecting materials with specific corrosion rates, solubility characteristics, and degradation kinetics, the system achieves precise release rate control through material parameter selection rather than complex mechanical or electronic control systems.

Inventive Principle:

Principle #35Parameter changes

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 effectively maintains active additive concentrations, enhancing electrochemical reaction rates and efficiency, and extending the cell's operational life by continuously replenishing the additives as needed.

Implementation Method 1

using mechanisms like galvanic corrosion or soluble containers to control the release

Methodology Applied

Scientific EffectGalvanic corrosion:

Implementation Method 2

an additive medium is designed to corrode or dissolve, releasing the additives into the electrolyte

Methodology Applied

Scientific EffectDissolution: Solvation

Data Source

PatentEP3783733A1Systems and methods for management of additives in electrochemical cells

Publication Date: 2021.02.24 NANTENERGY INC

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AI summary

The present disclosure relates to an electrochemical cell comprising a fuel electrode for oxidizing a fuel, an oxidant electrode for reducing an oxidant, and an ionically conductive medium for conducting ions between the fuel and oxidant electrodes to support electrochemical reactions at the fuel and oxidant electrodes. The ionically conductive medium comprises at least one active additive for enhancing (controlling the rate, overpotential and/or the reaction sites for) at least one electrochemical reaction within the cell. The cell further comprises an additive medium in contact with the ionically conductive medium and containing the at least one active additive capable of corroding or dissolving in the ionically conductive medium. The additive medium and/or casing is configured to release the active additive to the ionically conductive medium as a concentration of the active additive in the ionically conductive medium is depleted during operation of the cell.