Heat it, and the lithium comes out. Then the solvent resets.
En los laboratorios de la Universidad de Columbia, un equipo de investigadores ha encontrado una forma de extraer litio de salmueras subterráneas sin recurrir a los vastos estanques de evaporación que durante décadas han marcado el ritmo lento y sediento de la industria. La tecnología, llamada S3E, aprovecha un disolvente sensible a la temperatura para capturar y liberar el mineral en ciclos reutilizables, prometiendo semanas donde antes se necesitaban meses y menos agua en regiones donde el agua ya escasea. En un mundo que acelera su transición eléctrica, este hallazgo plantea una pregunta fundamental: ¿puede la ciencia de laboratorio sobrevivir al contacto con la escala industrial?
- La demanda global de litio crece sin pausa junto al auge del vehículo eléctrico, pero el método dominante —evaporación solar en desiertos como el Atacama— consume tierra, agua y tiempo en cantidades que el planeta difícilmente puede seguir cediendo.
- El S3E rompe ese ciclo al usar un disolvente que captura litio y agua a temperatura ambiente y los libera concentrados al calentarse, sin necesidad de materiales adsorbentes ni refinerías complejas.
- Las pruebas en laboratorio con salmueras sintáticas del Mar de Salton recuperaron el 40% del litio disponible en cuatro ciclos consecutivos con el mismo disolvente, demostrando que la operación continua es viable.
- La tecnología podría desbloquear yacimientos hoy considerados inviables económicamente y diversificar las cadenas de suministro globales, reduciendo la dependencia de enclaves geográficos y métodos extractivos de alto impacto.
- El proceso sigue en fase de prueba de concepto: el verdadero desafío será escalar los resultados del laboratorio a la rugosa realidad de la producción industrial.
En la Universidad de Columbia, un equipo de investigadores ha desarrollado una tecnología llamada S3E —Extracción Selectiva por Disolvente Conmutable— capaz de extraer litio directamente de salmueras subterráneas sin los enormes estanques de evaporación que hoy dominan la industria. El método usa un disolvente que, a temperatura ambiente, captura litio y agua de la salmuera; al calentarse, los libera en forma concentrada y vuelve a su estado original, listo para un nuevo ciclo. El calor necesario puede provenir de fuentes de baja calidad, como el calor residual industrial o la energía solar térmica, lo que reduce significativamente los costes energéticos.
Actualmente, cerca del 40% del litio mundial procede de salmueras en desiertos como el Atacama chileno o zonas de Nevada, donde el método estándar consiste en bombear el agua salada a grandes balsas poco profundas y esperar meses o años a que el sol evapore el líquido. Es un proceso barato y probado, pero devora extensiones de terreno, condiciones climáticas específicas y cantidades ingentes de agua en regiones donde este recurso ya es crítico.
Las pruebas de laboratorio se realizaron con salmueras sintéticas basadas en las condiciones del Mar de Salton, en California, uno de los mayores yacimientos de litio sin explotar de Estados Unidos. En cuatro ciclos consecutivos con el mismo lote de disolvente, el sistema recuperó aproximadamente el 40% del litio presente, confirmando la viabilidad de la operación continua.
Aunque la tecnología permanece en fase de prueba de concepto, sus implicaciones son considerables: si logra escalarse, podría competir con la evaporación solar y la minería de roca dura, abrir depósitos hoy inviables económicamente y aliviar parte del impacto ambiental asociado a la extracción tradicional. Para un mundo empeñado en electrificar el transporte y almacenar energías renovables, esa flexibilidad tiene un valor que va más allá del laboratorio.
At Columbia University, a team of researchers has engineered a way to pull lithium directly from underground brines using a solvent that changes its behavior with temperature—a shift that could reshape how the world sources one of the most critical materials for electric vehicles and energy storage. The technology, called Switchable Solvent Selective Extraction, or S3E, works without the sprawling evaporation ponds that have dominated lithium production for decades, and it does so while consuming far less water and taking weeks instead of months or years.
Right now, about 40 percent of the world's lithium comes from brines buried beneath desert floors, particularly in Chile's Atacama region and parts of Nevada. The standard method is brutally simple: pump the salty water into massive shallow ponds and wait. The sun does the work, evaporating water until the lithium concentration rises enough to extract. It's cheap and proven, but it demands enormous tracts of land, specific climate conditions, and enormous quantities of water—a particularly acute problem in places where water is already scarce. As demand for lithium surges alongside the electric vehicle boom, that bottleneck has become harder to ignore.
The Columbia team's approach works differently. Their solvent captures both lithium and water from the brine at room temperature. When heated, the same solvent releases both components in a more concentrated form and returns to its original state, ready to be used again. The beauty of this cycle is that it doesn't require the adsorbent materials or complex refining steps that other direct extraction methods demand. Better still, the heat source can be low-grade—industrial waste heat, solar thermal energy—which means the process doesn't demand expensive, high-quality energy inputs.
Laboratory tests used synthetic brines modeled on conditions in California's Salton Sea, a geothermal region in the state's south that holds some of the largest untapped lithium reserves in the United States. Over four consecutive extraction cycles using the same batch of solvent, the system recovered about 40 percent of the lithium present. The researchers see this as proof that continuous operation is feasible and that further refinement could push those numbers higher.
The technology remains in proof-of-concept stage, still confined to the lab. But the implications are substantial. If S3E can be scaled and optimized, it could compete directly with both solar evaporation and hard-rock mining—the two methods that currently dominate global lithium supply chains. More importantly, it could unlock deposits that are currently considered uneconomical to develop, diversifying where lithium comes from and reducing some of the environmental toll that mining has traditionally exacted. For a world racing to electrify transportation and store renewable energy, that flexibility matters. The question now is whether the lab results can survive contact with the messy realities of industrial production.
Citas Notables
The process can be powered by low-temperature heat sources such as industrial waste heat or solar thermal energy, potentially reducing energy demands— Columbia University research team
La Conversación del Hearth Otra perspectiva de la historia
Why does the temperature sensitivity matter so much? Couldn't you just use any solvent that captures lithium?
The temperature sensitivity is the whole mechanism. At room temperature, the solvent is "open"—it grabs both lithium and water. When you heat it, the molecular structure changes and it releases both. That means you don't need to add chemicals or use mechanical separation. You just turn up the heat and the lithium comes out.
But the lab tests only recovered 40 percent. That sounds low.
It is, for now. But remember—they used the same solvent four times in a row. The point wasn't to maximize recovery in one cycle; it was to show the solvent could be reused without degrading. That's the real win. If you can run it continuously and each cycle adds another 40 percent, you're looking at something viable.
What about the places where lithium is already being extracted? Will this replace evaporation ponds?
Not immediately. Solar evaporation is entrenched, cheap, and it works. But this opens doors to deposits that evaporation can't touch—places where there's not enough sun, or where water is too precious to spare on months-long ponds. It's not about replacing one method; it's about having options.
The Salton Sea is geothermal. Does that mean S3E only works in geothermal regions?
No. They tested it on synthetic brines modeled after the Salton Sea, but the solvent itself doesn't care where the heat comes from. Industrial waste heat, solar thermal, even natural gas—any low-grade heat source works. That's actually what makes it adaptable.
How long until this is actually mining lithium at scale?
That's the honest question. Proof of concept to commercial operation is a long road. You need to test it with real brines, not synthetic ones. You need to solve engineering problems that don't show up in the lab. But the fact that it works at all, that the solvent survives multiple cycles—that's the hard part. The scaling is engineering.