Scientists associated with India's Bhabha Atomic Research Centre have developed a chemical extraction method intended to make lithium recovery from natural seawater more efficient.
The research addresses a significant scientific challenge: although seawater contains lithium, the element is present at very low concentrations alongside much larger quantities of other dissolved substances. Separating lithium selectively without consuming excessive chemicals or generating large amounts of waste has therefore been a major obstacle to practical recovery.
Editorial Insight
Key Highlights
Important points readers should notice.
Issue/Event: BARC-associated researchers develop a solvent-efficient method for lithium extraction from natural seawater.
Location: India; research associated with the Bhabha Atomic Research Centre.
Authority/Organisation: Bhabha Atomic Research Centre researchers; findings published in the scientific journal Talanta.
Action Taken: Researchers used alkaline preconditioning and a DBM–MIBK extraction system, reporting approximately 90% lithium recovery under optimised conditions and testing reuse across five cycles.
Impact: The research offers a possible route for improving lithium recovery from seawater and other secondary resources, subject to scale-up, economic and environmental evaluation.
The study, titled Development of a novel selective extraction system for lithium and application to its secondary resources, was published in the journal Talanta in 2026. A research news report published on October 17 brought renewed attention to the findings.
The team developed a system based on dibenzoylmethane and methyl isobutyl ketone, commonly abbreviated as DBM and MIBK. Under optimised experimental conditions, the method achieved approximately 90% lithium extraction from natural seawater that had undergone chemical preconditioning.
The result demonstrates a potential approach for recovering lithium from dilute sources. It does not establish that seawater can already be processed economically at an industrial scale.
Editorial Analysis
Why This Matters
Lithium is an important material for battery technologies, but recovering it from seawater is difficult because of its low concentration and the presence of competing dissolved ions. A process that can extract lithium with less solvent and fewer additional chemicals could provide useful scientific advances if it can be scaled successfully. The method's reported application to coal fly ash and spent lithium-ion batteries also raises possibilities for resource recovery beyond natural water sources. The key question is whether laboratory performance can translate into a process that is affordable, reliable and environmentally responsible at larger scales. The current results are promising, but they do not yet establish commercial viability.
Why Lithium Is Difficult to Recover From Seawater
Lithium is an important raw material for rechargeable batteries used in electric vehicles, consumer electronics and stationary energy-storage systems.
Conventional supply chains rely largely on mineral ores and lithium-rich brines. These resources require extraction and processing, and their availability and environmental impacts vary by location and production method.
Seawater represents a possible alternative resource because it contains dissolved lithium across enormous volumes of water. However, the concentration is extremely low, making separation difficult.
The main challenge is selectivity. Seawater contains substantial amounts of sodium, magnesium, calcium and other ions. A useful extraction process must capture lithium while limiting the transfer of competing elements into the recovered material.
A method that extracts lithium efficiently in a laboratory may still face major challenges when scaled up. These include the volume of seawater required, chemical consumption, energy use, equipment costs, solvent losses and the management of waste streams.
BARC's research focuses on improving the chemical separation stage so that lithium can be recovered with less solvent and fewer additional extraction agents.
How the New Extraction Method Works
The researchers used a sequence of chemical treatments to prepare seawater before the main extraction step.
First, the seawater underwent alkaline preconditioning using sodium hydroxide and sodium carbonate. The researchers reported removing more than 99% of interfering multivalent ions, including magnesium and calcium, during this preparation stage without losing the target lithium.
The prepared solution was then contacted with an organic mixture containing dibenzoylmethane dissolved in methyl isobutyl ketone.
Dibenzoylmethane acts as a chemical ligand that helps bind lithium under the selected conditions. MIBK serves as the extraction solvent and also helps stabilise the lithium-containing complex. This dual role allows the system to operate without the additional synergistic agents often used in comparable solvent-extraction methods.
Under optimised conditions, the researchers achieved approximately 90% lithium extraction using an organic-to-aqueous phase ratio of 0.1. In practical terms, this represents 100 millilitres of organic phase for every litre of aqueous solution used in that extraction step.
The study reported that this ratio reduced solvent requirements by roughly an order of magnitude compared with conventional beta-diketone systems using an organic-to-aqueous ratio of at least 1.
After extraction, dilute nitric acid was used to transfer the lithium out of the organic phase into a separate solution. The researchers also optimised conditions for reusing the solvent system.
These results point to a more solvent-efficient laboratory process. They do not, by themselves, determine the total cost or environmental footprint of a complete commercial operation.
Around 90% Recovery Maintained Across Five Cycles
One of the reported findings was the system's performance during repeated use.
The research team tested solvent reuse over five cycles and reported lithium recovery remaining around 90%. Repeated extraction and recovery can be important for determining whether a chemical process is suitable for further development, because fresh solvent consumption can significantly affect costs and waste generation.
The method also progressively enriched lithium in the stripping solution, which is the liquid used to recover lithium from the loaded organic phase.
However, the researchers identified operational constraints. Contact time must be controlled carefully because prolonged mixing under high ionic-strength conditions can destabilise the interface between the liquid phases and lead to persistent emulsions.
The organic phase also experienced physical losses of approximately 10% per cycle, according to the research summary, meaning additional solvent would be needed to maintain operating volumes.
These limitations matter when considering scale-up. High extraction efficiency is only one part of process performance; solvent recovery, repeated-cycle stability and waste management also affect the overall economics.
The Method Could Have Applications Beyond Seawater
The study did not limit its investigation to natural seawater.
The researchers also applied the extraction system to secondary lithium resources, including coal fly ash and spent lithium-ion battery samples. Such materials can contain recoverable lithium, although their compositions and processing requirements differ substantially from those of seawater.
Recovering lithium from secondary resources could eventually support recycling and resource recovery by reducing the amount of valuable material lost during disposal or industrial processing.
However, the inclusion of these materials in laboratory testing does not mean that the same process can be used unchanged for every source. Different feed materials may require separate preparation, purification and recovery steps.
The broader significance of the research is that the same underlying chemical approach may have uses in several difficult lithium-separation settings, subject to further testing and process development.
What the Findings Mean for India's Battery Materials Research
India's interest in lithium recovery is connected to the growing importance of battery materials in electric mobility, electronics and renewable-energy storage.
Research into alternative resources could expand the range of options available to scientists and industrial developers. Better extraction techniques may eventually help recover lithium from dilute or previously underused sources, provided the methods can be scaled economically and responsibly.
The BARC study contributes to this research by demonstrating a simplified solvent system with high extraction performance under optimised laboratory conditions.
It is too early, however, to conclude that the method will replace conventional lithium mining or significantly change India's lithium imports. Those outcomes would depend on further engineering, independent scale-up studies, detailed cost analysis and environmental assessment.
The immediate scientific achievement is the demonstration of a more solvent-efficient route for extracting lithium from natural seawater under controlled experimental conditions.
Important Questions Before Commercial Use
Moving from laboratory research to industrial processing requires more than repeating a successful extraction experiment.
Researchers and potential industrial partners would need to determine how the process performs with varying seawater compositions, across longer operating periods and at much larger volumes.
They would also need to account for the costs of alkaline preconditioning, acid stripping, solvent recovery, equipment, energy and the treatment of residual liquids. Environmental performance would depend on the full process, not simply the reduced solvent ratio.
The reported five-cycle reuse test is a useful starting point, but it is not equivalent to continuous industrial operation over months or years.
Further studies could clarify whether the technique can be integrated into existing mineral-processing or resource-recovery systems and whether the recovered lithium can meet the purity requirements of downstream applications.
For now, the findings offer a promising research direction rather than a ready-to-deploy source of commercial lithium.
