Moving towards a circular economy in battery recycling
Every year, millions of smartphones are upgraded and tossed aside — and with them, billions of old lithium batteries that typically end up in landfills or incinerators. But a team of researchers from Shenyang Agricultural University in China may have found a much better use for them.
Their new method takes discarded mobile phone batteries and combines them with lignin — a byproduct of the paper and biofuel industries — to create a high-performance electrode material for sodium-ion batteries. It’s a circular economy win on two fronts: tackling e-waste and giving industrial waste a meaningful second life simultaneously.
The process uses hydrothermal synthesis to extract nickel and cobalt from old batteries, then fuses these metals with carbon derived from lignin. The result is a composite material that punches well above its weight. During lab testing, the electrode achieved an initial discharge capacity exceeding 1,000 milliampere hours per gram — and crucially, it held up even under high power demands.
So why does this matter beyond the clever recycling angle? Sodium-ion batteries have long been seen as a promising alternative to lithium-ion technology. Sodium is far more abundant and cheaper than lithium, making it an attractive option for large-scale energy storage in electric vehicles and power grids. The main sticking point has always been finding efficient electrode materials — and this research takes a direct swing at that problem.
The study, published in the journal BiocharX, still has some distance to cover before it becomes commercially viable. Scaling the process from a lab setting to industrial production is never straightforward. But if it gets there, the implications are significant: cheaper batteries built from waste materials, less e-waste polluting the environment, and a more sustainable supply chain for the clean energy transition.
It’s a reminder that some of the most promising solutions to tomorrow’s energy problems might already be sitting in your junk drawer.
This topic was featured in Great News podcast episode 34.
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Source: Interesting Engineering
