Decoupled Electrode Iron-Air Storage for Long-Duration High Current

Resolve Bottlenecks,
Find Innovative SolutionsGenerate Solutions

Solution Overview

Problem

Existing energy storage technologies face challenges in achieving long and ultra-long duration storage with high current density, as parasitic losses and mechanical cell architecture constraints limit scalability and efficiency, particularly in metal-air batteries like iron-air batteries.

Innovation Solution

A decoupled electrode electrochemical energy storage system is designed with a mobile metal electrode and separate electrolyte circulation, allowing independent optimization of electrodes and decoupling energy storage capacity from power capability, using direct reduced iron (DRI) pellets and forced convection for ion transport.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Duration of action of moving object

If current density is decreased to achieve long duration storage, then energy storage duration is improved, but parasitic losses increase as a percentage

Engineering Contradiction:

Improveenergy storage durationVSAvoidparasitic losses

Core Design Contradiction:

Duration of action of moving objectVSLoss of energy

Solution Approach 1:

The battery system is segmented into multiple independent cells, each capable of operating at optimal current density. By dividing the total energy storage capacity across multiple cells rather than using one large cell at low current density, the system maintains high current density operation while achieving long duration storage through parallel cell operation.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The system pre-charges multiple cells in parallel during off-peak hours when demand is low, allowing each cell to operate at high current density during charging. During discharge, multiple pre-charged cells operate simultaneously at optimal current density, avoiding the need to operate at low current density and reducing parasitic losses as a percentage of total energy.

Inventive Principle:

Principle #10Preliminary action

2Quantity of substance

If fixed iron anode is used for long duration storage, then energy storage capacity is improved, but mechanical cell architecture complexity increases

Engineering Contradiction:

Improveenergy storage capacityVSAvoidmechanical cell architecture

Core Design Contradiction:

Quantity of substanceVSDevice complexity

Solution Approach 1:

The fixed iron anode is divided into multiple smaller anodes distributed across several cells. Each cell contains a manageable amount of iron anode material, simplifying the mechanical architecture of individual cells while achieving total system capacity through the aggregation of multiple cells. This segmentation makes the system more scalable and easier to maintain.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The system transitions from a static fixed anode configuration to a dynamic modular architecture where cells can be independently activated, deactivated, or replaced. This dynamic configuration allows flexible scaling of energy storage capacity without proportionally increasing mechanical complexity, as cells can be added or removed from the parallel arrangement.

Inventive Principle:

Principle #15Dynamics

3Adaptability or versatility

If metal electrode is made mobile to decouple capacity from power, then system adaptability is improved, but device complexity increases

Engineering Contradiction:

Improvedecoupling capacity from powerVSAvoidelectrode movement mechanism

Core Design Contradiction:

Adaptability or versatilityVSDevice complexity

Solution Approach 1:

The mobile metal electrode system is segmented into multiple discrete electrode modules that can be independently positioned or activated. This segmentation allows the system to achieve decoupling of capacity from power by selectively engaging different numbers of modules, while keeping each individual module mechanically simple and manageable.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The system uses partial activation of mobile electrodes, where only the necessary number of electrode modules are deployed based on current power demands. This allows capacity to be decoupled from power by having more electrode material available than immediately needed, activating only the required portion during operation, thereby reducing the mechanical complexity of constantly moving all electrodes.

Inventive Principle:

Principle #16Partial or excessive 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

The system enables long-duration energy storage with high current density, reducing parasitic losses and assembly costs, and allowing independent optimization of electrodes for improved performance and scalability.

Implementation Method 1

a pump configured to move electrolyte between the metal electrode vessel and the at least one other electrode

Methodology Applied

Scientific EffectForced convection: Forced Convection

Implementation Method 2

Metal-air batteries are attractive options for electrochemical energy storage due to the low cost and abundance of air as a reagent for the energy storing reactions

Methodology Applied

Scientific EffectOxidation: Oxidation