Battery Cathode Waste Catalysts for Trace Organic Water Remediation

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Solution Overview

Problem

Existing electrochemical water remediation technologies face challenges due to high costs of advanced materials like BDD and carbon nanotubes, and the instability of electrode materials affects their practicality and operational costs, particularly for removing trace organic pollutants.

Innovation Solution

Utilizing transition metal oxides (TMO) from waste lithium battery cathodes as catalysts in an electrochemical cell for degrading trace organic contaminants, where the TMOs are solubilized and reduced to metallic form at the cathode, allowing for recovery and offsetting remediation costs.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Productivity

If advanced electrode materials like BDD, precious metals, or carbon nanotubes are used in electrochemical water remediation, then contaminant removal efficiency is improved, but material cost increases significantly

Engineering Contradiction:

Improvecontaminant removal efficiencyVSAvoidmaterial cost

Core Design Contradiction:

ProductivityVSEase of manufacture

Solution Approach 1:

The patent uses inexpensive, readily available materials such as stainless steel electrodes and common electrolyte salts instead of expensive advanced materials like BDD or carbon nanotubes. The system accepts that electrodes will degrade over time and requires periodic replacement, trading material cost for operational simplicity and initial affordability.

Inventive Principle:

Principle #27Cheap short-living objects (Disposable)

Solution Approach 2:

The patent optimizes operational parameters such as applying multiple voltage cycles (e.g., 30 minutes at 13V, 30 minutes at 7V) to enhance contaminant removal efficiency using low-cost materials. By adjusting voltage, time, and electrolyte composition, the system achieves effective remediation without requiring expensive electrode materials.

Inventive Principle:

Principle #35Parameter changes

2Productivity

If electrode materials are used to generate reactive oxygen species for contaminant degradation, then oxidation efficiency is improved, but electrode stability deteriorates due to accelerated dissolution

Engineering Contradiction:

Improveoxidation efficiencyVSAvoidelectrode stability

Core Design Contradiction:

ProductivityVSReliability

Solution Approach 1:

The patent employs a two-electrode system where the sacrificial anode (less noble metal) automatically dissolves to provide metal ions that form active complexes for oxidation, while the cathode remains stable and can be reused. The system self-regulates by using the anode consumption to drive the remediation process without requiring external intervention to maintain stability.

Inventive Principle:

Principle #25Self-service

Solution Approach 2:

The patent converts the harmful effect of electrode dissolution into a beneficial process by using the dissolving anode to supply metal ions that form active oxidation complexes. The degradation of the sacrificial anode, which would normally be considered a failure mode, becomes the mechanism for generating the active species needed for contaminant removal.

Inventive Principle:

Principle #22Blessing in disguise (Convert harm into benefit)

3Speed

If high voltage is applied to accelerate contaminant degradation, then treatment speed is improved, but energy consumption and electrode dissolution increase

Engineering Contradiction:

Improvetreatment speedVSAvoidenergy consumption

Core Design Contradiction:

SpeedVSLoss of energy

Solution Approach 1:

The patent uses cyclic voltage application with multiple stages (e.g., 30 minutes at 13V followed by 30 minutes at 7V) to balance treatment speed and energy efficiency. High voltage is applied intermittently to achieve rapid contaminant removal when needed, followed by lower voltage periods to reduce energy consumption and electrode dissolution, maintaining an average effective treatment rate.

Inventive Principle:

Principle #19Periodic 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 method achieves efficient degradation of organic contaminants like BPA and PFAS, with potential for high recovery of valuable metals, providing a cost-effective and sustainable solution for water remediation.

Implementation Method 1

electrochemical advanced oxidation processes (EAOP), which involve the generation of highly reactive oxidizing species, such as hydroxyl radicals (OH) and others, directly at the surface of electrodes

Methodology Applied

Scientific EffectElectrochemical oxidation: Oxidation

Implementation Method 2

electrochemical approaches offer several advantages, including high efficiency, and selectivity towards specific contaminants

Methodology Applied

Scientific EffectElectrolysis: Electrolysis

Implementation Method 3

the TMOs are solubilized and reduced to metallic form at the cathode

Methodology Applied

Scientific EffectElectrochemical reduction: Reduction

Data Source

PatentUS20260062321A1Electrochemical water remediation to remove trace organics using lithium battery cathode waste

Publication Date: 2026.03.05 UCHICAGO ARGONNE LLC

AI summary

A method for electrochemical remediation of trace organic contaminants from water comprises pumping water containing a trace organic contaminant through an electrochemical cell comprising an anode and a cathode in circuit with a DC power source to apply an electric potential across the electrodes; wherein the anode contacts a catalyst for electrochemically degrading the trace organic contaminant; and the catalyst comprises a transition metal oxide (TMO) from waste lithium battery cathodes. An apparatus suitable for performing the method also is described.