Finnish pulp and paper company Stora Enso and Chinese anode maker Shanshan will build a demonstration line for lignin-based hard carbon anode materials at Shanshan's site in Ningbo, China.
Wait, what's hard carbon?
Hard carbon is disordered carbon that won't turn into graphite however hot you heat it, and it's the anode in sodium-ion batteries: sodium ions are too big to slot into graphite the way lithium does, so graphite won't work. Stora Enso's version, Lignode, comes from carbonizing kraft lignin, the polymer that holds wood fibers together and that pulp mills mostly burn for energy. Stora Enso put $11 million into a Lignode pilot at its Sunila mill in Finland in 2019, next to what was then the world's largest kraft lignin plant (50 KTA). Its partner for taking it into batteries was Northvolt, which we covered in 2022 and which filed for bankruptcy in March 2025.
Enter Shanshan:
Shanshan is the world's largest supplier of lithium-ion anode materials, with about 21% of the market, and is planning a 150 KTA anode plant in Inner Mongolia. That's the scale-up know-how Stora Enso doesn't have.
By the way:
Stora Enso closed lignin extraction at Sunila in 2023, and it still says its goal is hard carbon production in Europe, though the demo line is going to China. And Shanshan's parent has spent the past year and a half in a court-led restructuring that creditors approved in April, handing control to a state-owned Anhui group.