Researchers in Finland have discovered that electrodes in lithium batteries containing cobalt can be reused following a special process.
In comparison to traditional recycling, which typically extracts metals from crushed batteries by melting or dissolving them, the new process—which newly saturates the electrodes with lithium—saves valuable raw materials, and likely also energy.
The rechargeable batteries problem
The proliferation of electric cars, smartphones, and portable devices is leading to an estimated 25 percent increase globally in the manufacturing of rechargeable batteries each year.
Many raw materials used in the batteries, such as cobalt, may soon be in short supply. The European Commission is preparing a new battery decree, which would require the recycling of 95 percent of the cobalt in batteries. Yet existing battery recycling methods are far from perfect.
Almost like new
Rechargeable lithium-ion batteries have two electrodes between which electrically charged particles move. Lithium cobalt oxide is used in one electrode and, in most of the batteries, the other is made of carbon and copper.
In traditional battery recycling methods, some of batteries’ raw materials are lost and lithium cobalt oxide turns into other cobalt compounds, which require a lengthy chemical refinement process to turn them back into electrode material.
The new method from scientists at Aalto University sidesteps this painstaking process: by replenishing the spent lithium in the electrode through an electrolysis process—commonly used in industry—the cobalt compound can be directly reused.
The results, published in ChemSusChem journal, show that the performance of electrodes newly saturated with lithium is almost as good as that of those made of new material.
Aalto University Professor Tanja Kallio believes that with further development the method would also work on an industrial scale.
‘By reusing the structures of batteries we can avoid a lot of the labour that is common in recycling and potentially save energy at the same time. We believe that the method could help companies that are developing industrial recycling,’ Kallio says.