German researchers have developed a sodium-ion battery technology using lignin-based hard carbon as the negative electrode, showing no significant degradation after 100 cycles. Lignin, a by-product of the wood and pulp industry, was chosen for its conductivity and electron storage capabilities. The goal is to achieve 200 cycles for the 1-Ah full cell, targeting stationary or mobile storage applications. This project supports independence from critical raw materials and aims to transition to cheaper, more sustainable batteries.