Houston scientists develop 'recharge-to-recycle' reactor for lithium-ion batteries

Engineers at Rice University have developed a cleaner, highly efficient method to recover lithium from end-of-life lithium-ion batteries, potentially transforming the sustainability and economics of the EV battery supply chain. The research, published in Joule, introduces a “recharge-to-recycle” electrochemical reactor that uses the same fundamental chemistry behind charging a battery to extract lithium ions directly from used cathode materials. The process works by recharging the waste cathode, causing lithium ions to migrate into water. These ions are then processed into high-purity lithium hydroxide, the exact salt required for manufacturing new lithium-ion batteries—eliminating multiple intermediate steps found in conventional recycling methods. Importantly, the lithium hydroxide produced was over 99% pure, making it suitable for immediate reuse in battery production. Traditional lithium recycling is energy-intensive, uses harsh chemicals, and produces significant waste. This new approach simplifies the process dramatically, reduces environmental impact, and lowers costs. It addresses a growing concern as the electric vehicle sector generates increasing volumes of battery waste and as lithium prices remain volatile due to complex mining and refining challenges. The method also demonstrated promising scalability. The Rice team expanded the system to 20 square centimeters, completed a 1,000-hour durability test, and successfully processed 57 grams of industrial black mass from partner TotalEnergies. Across the trial, the reactor achieved an average lithium recovery rate near 90%, and it worked with a range of commercial battery chemistries, including LFP, LMO, and NMC. Going forward, the researchers plan to scale up and optimize the system to maintain efficiency at higher lithium hydroxide concentrations, identifying concentration bottlenecks as the next challenge to overcome. The team believes that resolving this will be key for large-scale industrial deployment and improved sustainability across the lithium battery lifecycle.