Short answer

When designing recycling processes for lithium-ion batteries, consider using polycarboxylic acid-based deep eutectic solvents, specifically choline chloride with maleic acid, as they offer high efficiency and a more sustainable approach.

Field: Resource Management
Source: Trends in Sciences (2025)
Method: Experimental analysis and kinetic modelling
Evidence: Strong effect

Polycarboxylic acid-based deep eutectic solvents, particularly choline chloride with maleic acid, can efficiently recover critical metals like lithium, cobalt, nickel, and manganese from spent lithium-ion batteries. This resource management research insight is drawn from a 2025 study published in Trends in Sciences. Using Experimental analysis and kinetic modelling, researchers explored how this design variable affects real-world outcomes. The key design takeaway: When designing recycling processes for lithium-ion batteries, consider using polycarboxylic acid-based deep eutectic solvents, specifically choline chloride with maleic acid, as they offer high efficiency and a more sustainable approach.

Study

Resource ManagementNew This WeekStrong effect

Deep Eutectic Solvents Enhance Critical Metal Recovery from Lithium-Ion Batteries by 99%

Trends in Sciences · 2025

Key Findings

01Choline chloride: Maleic acid DES achieved high recovery rates: 99.18% Li, 65.36% Co, 94.97% Ni, and 67.88% Mn.
02Optimal conditions for recovery were a solid/liquid ratio of 20 g/L at 80 °C for 2 hours.
03Higher solid/liquid ratios reduced recovery due to mass transfer limitations and solution saturation.
04The Jander model best described the leaching mechanism, indicating a diffusion-controlled process.
05Activation energies for the leaching process were calculated for each metal using the optimal DES.

Application

Design takeaway

How to apply

In a design project focused on sustainable electronics recycling, explore the use of deep eutectic solvents for recovering valuable metals from discarded batteries. Experiment with different solvent compositions and process parameters to optimize recovery rates for specific target metals.

Project actions

01When researching battery recycling, look into green chemistry approaches like using deep eutectic solvents.
02Consider the kinetic aspects of your chosen recycling method to understand how quickly and efficiently it works.

Method & Evidence

AimTo evaluate the efficiency and kinetic mechanisms of polycarboxylic acid-based deep eutectic solvents for recovering critical metals from spent lithium-ion batteries.

MethodExperimental analysis and kinetic modelling

ProcedureThree different deep eutectic solvents (DES) were synthesized using choline chloride and polycarboxylic acids (succinic, malonic, and maleic acids). These DES were then used to leach critical metals (Li, Co, Ni, Mn) from spent lithium-ion batteries under varying conditions (solid/liquid ratio, temperature, time). The recovery rates were measured, and kinetic models were applied to understand the leaching process.

ContextRecycling of spent lithium-ion batteries

Variables

IV["Type of deep eutectic solvent (succinic acid, malonic acid, maleic acid with choline chloride)","Solid/liquid ratio","Temperature","Time"]

DV["Percentage recovery of Li, Co, Ni, Mn","Leaching mechanism (kinetic model)"]

CV["Stirring rate","Particle size of battery material","Initial concentration of metals in the battery material"]

Strengths & Limitations

Strengths

+Utilizes environmentally friendly DES components.
+Provides kinetic analysis to understand the underlying mechanism.
+Achieves very high recovery rates for key metals.

Limitations

The exact composition of the battery materials used in the study might differ from real-world waste, and scaling up this process from a lab setting to an industrial level would present significant engineering challenges.

Reliability & validity

The study's validity is supported by kinetic modelling and the use of multiple parameters. Reliability could be further enhanced by repeating experiments and ensuring consistent material preparation.

Think critically

While this study shows high recovery rates for some metals, consider the economic feasibility and environmental impact of producing and disposing of the deep eutectic solvents themselves on an industrial scale.

Design Principles

"Utilize deep eutectic solvents for efficient and selective recovery of valuable materials from waste streams."

As the demand for lithium-ion batteries grows, so does the challenge of managing end-of-life products. Developing effective and sustainable recycling methods is crucial for resource security and environmental protection. This research offers a promising chemical approach to recover valuable materials, reducing reliance on primary mining.

What This Means for Your Design

Scientists found a special liquid mixture (called a deep eutectic solvent) that can pull out valuable metals like lithium and nickel from old batteries really well, with one mixture getting over 99% of the lithium.

How to use in your project

1.Reference this study when discussing sustainable material recovery methods or exploring novel chemical processes for recycling in your design project.

Add to My Project

Quick Cite

Paragraph starter

This research demonstrates the potential of polycarboxylic acid-based deep eutectic solvents for the efficient recovery of critical metals from spent lithium-ion batteries. The study highlights that a choline chloride: maleic acid solvent achieved recovery rates exceeding 99% for lithium and 94% for nickel under optimized conditions, suggesting a promising avenue for sustainable battery recycling by minimizing resource depletion and waste.

Source

Trends in Sciences

Polycarboxylic Acid-Based Deep Eutectic Solvents for Critical Metal Recovery from Lithium-Ion Batteries: Kinetic and Efficiency Analysis

journal · 2025

View source

Questions About This Research

What does the research say about deep eutectic solvents enhance critical metal recovery from lithium-ion batteries by 99%?: When designing recycling processes for lithium-ion batteries, consider using polycarboxylic acid-based deep eutectic solvents, specifically choline chloride with maleic acid, as they offer high efficiency and a more sustainable approach. Evidence: Trends in Sciences (2025).
Why does "Deep Eutectic Solvents Enhance Critical Metal Recovery from Lithium-Ion Batteries by 99%" matter for design?: As the demand for lithium-ion batteries grows, so does the challenge of managing end-of-life products. Developing effective and sustainable recycling methods is crucial for resource security and environmental protection. This research offers a promising chemical approach to recover valuable materials, reducing reliance on primary mining.
How can designers apply this research?: When designing recycling processes for lithium-ion batteries, consider using polycarboxylic acid-based deep eutectic solvents, specifically choline chloride with maleic acid, as they offer high efficiency and a more sustainable approach.
What were the main findings?: Choline chloride: Maleic acid DES achieved high recovery rates: 99.18% Li, 65.36% Co, 94.97% Ni, and 67.88% Mn.. Optimal conditions for recovery were a solid/liquid ratio of 20 g/L at 80 °C for 2 hours.. Higher solid/liquid ratios reduced recovery due to mass transfer limitations and solution saturation.. The Jander model best described the leaching mechanism, indicating a diffusion-controlled process.
What research method was used?: Experimental analysis and kinetic modelling.
How strong is the evidence?: Evidence strength is rated Strong effect, based on a 2025 journal from Trends in Sciences.
What should I do differently in my next project?: In a design project focused on sustainable electronics recycling, explore the use of deep eutectic solvents for recovering valuable metals from discarded batteries. Experiment with different solvent compositions and process parameters to optimize recovery rates for specific target metals.
What are the limitations?: Further investigation is needed into the optimal DES composition and the influence of agitation on metal recovery. The study focused on specific metals and may not be directly applicable to all battery chemistries without modification.