Lithium Ion Batteries a Growing Source of PFAS Pollution, Study Finds

'Nature recently published an open-access article (not paywalled) that studies the lifecycle of lithium-ion batteries once they are manufactured,' writes Slashdot reader NoWayNoShapeNoForm. 'The study is a 'cradle-to-grave' look at these batteries and certain chemicals that they contain. The University researchers that authored the study found that the electrolytes and polymers inside lithium-ion batteries contain a class of PFAS known as bis-FASI chemicals. PFAS chemicals are internationally recognized pollutants, yet they are found in consumer and industrial processes, such as non-stick coatings, surfactants, and film-forming foams. PFAS chemicals have been found in windmill coatings, semiconductors, solar collectors, and photovoltaic cells.' Phys.org reports: Texas Tech University's Jennifer Guelfo was part of a research team that found the use of a novel sub-class of per- and polyfluoroalkyl (PFAS) in lithium ion batteries is a growing source of pollution in air and water. Testing by the research team further found these PFAS, called bis-perfluoroalkyl sulfonimides (bis-FASIs), demonstrate environmental persistence and ecotoxicity comparable to older notorious compounds like perfluorooctanoic acid (PFOA). The researchers sampled air, water, snow, soil and sediment near manufacturing plants in Minnesota, Kentucky, Belgium and France. The bis-FASI concentrations in these samples were commonly at very high levels. Data also suggested air emissions of bis-FASIs may facilitate long-range transport, meaning areas far from manufacturing sites may be affected as well. Analysis of several municipal landfills in the southeastern U.S. indicated these compounds can also enter the environment through disposal of products, including lithium ion batteries.

Toxicity testing demonstrated concentrations of bis-FASIs similar to those found at the sampling sites can change behavior and fundamental energy metabolic processes of aquatic organisms. Bis-FASI toxicity has not yet been studied in humans, though other, more well-studied PFAS are linked to cancer, infertility and other serious health harms. Treatability testing showed bis-FASIs did not break down during oxidation, which has also been observed for other PFAS. However, data showed concentrations of bis-FASIs in water could be reduced using granular activated carbon and ion exchange, methods already used to remove PFAS from drinking water. 'Our results reveal a dilemma associated with manufacturing, disposal, and recycling of clean energy infrastructure,' said Guelfo, an associate professor of environmental engineering in the Edward E. Whitacre Jr. College of Engineering. 'Slashing carbon dioxide emissions with innovations like electric cars is critical, but it shouldn't come with the side effect of increasing PFAS pollution. We need to facilitate technologies, manufacturing controls and recycling solutions that can fight the climate crisis without releasing highly recalcitrant pollutants.'

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