According to the researchers at Zhejiang University in China, this new device maximizes lithium yield from seawater while simultaneously desalinating water.
The world needs lithium at higher rates than ever before. But our current methods of getting it are breaking the planet. The answer to the lithium crisis might just be a high-tech, “solar-powered seesaw” extractor.
According to the researchers at Zhejiang University in China, this new device maximizes lithium yield from seawater while simultaneously desalinating water.“In this work, we report a solar-powered seesaw extractor to boost Li+ adsorption while minimizing scaling caused by competing ions during photothermal evaporation,” the researchers wrote in the study paper.Graphical depiction of the tech. Credit: Device journal. Problem with salty interferenceLithium is the crucial element of the modern world. It powers the smartphone to the electric vehicle in your driveway.But there is a hurdle: the world’s accessible lithium is vanishing. Land-based mining is a slow, thirsty, and environmentally destructive process that can’t keep pace with the skyrocketing demand for green energy.Interestingly, there is an alternative source in the oceans. Oceans are expected to hold vast reserves of 230 billion tons.However, harvesting this “white gold” is difficult because lithium is extremely diluted. Trying to pull lithium from seawater is like trying to find a single grain of sugar in a desert of salt.For years, scientists have struggled with sodium. Seawater contains 60,000 times more sodium than lithium. When engineers try to evaporate water to collect the lithium, the salt builds up so fast that it forms a scale that clogs equipment and halts production. This new solar-powered seesaw extractor aims to solve these existing challenges. Its design is basically a sandwich of high-tech materials. SPSE operates by placing a lithium-thirsty core between two sun-absorbing outer layers. Using solar energy, the device triggers evaporation to draw lithium inward, while its unique 30-degree tilt manages waste. As salt crusts form on the elevated end, the shifting weight causes the device to rock like a seesaw, submerging the buildup so the ocean can naturally wash it away. This self-cleaning cycle ensures the extractor stays clear of clogs, allowing for a continuous, solar-driven harvest.“The SPSE features a sandwich architecture, with a hydrophilic adsorbent layer placed between two hydrophobic photothermal layers,” the study noted. “The seesaw configuration enables Li+ to be elevated and concentrated through evaporation to overcome sluggish adsorption kinetics, while the associated salt scaling is removed by the seesawing motion,” it added.Design needs further refinementsIn testing, the seesaw model outperformed standard submerged methods by 69% in lithium uptake. As per the study, the prototype demonstrated “15.5-fold increase in local Li+ concentration to enhance adsorption kinetics.” Moreover, the seesaw motion ensures that salt does not clog the system. The extractor isolated lithium from competing sodium ions with a 370,000-fold efficiency.Perhaps most impressively, the process is also reported to double as a purifier with some optimization. It could yield drinking water as a sustainable byproduct of the extraction.Researchers described the system as “side-by-side seawater/brine desalination and lithium production.”The technology isn’t perfect yet. Reportedly, the current manganese-based filters degrade after about 30 uses, and the team is already considering switching to titanium-based materials for greater longevity.They also need to ensure the device can handle the natural pH levels of the open ocean without extra chemicals.The findings were reported in the journal Device on February 4.
Environment Inventions And Machines Lithium Lithium Mining Seawater Lithium Solar-Powered Seesaw Extractor Sustainability
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