Stora Enso has developed a new process to replace fossil-based carbon in today's lithium-ion batteries. They use lignin from wood to produce a renewable carbon. Lignin is a collection of aromatic compounds in wood that gives it strength and resistance to chemical attacks. Lignin is the part of the wood that you want to get rid of to get a pure cellulose for the pulp in paper production. It is thus a side product from the pulp industry. However, the lignin compounds have a high content of carbon in their chemical structure, which is why it is a good candidate for conversion to the type of carbon used in today's batteries. This process also brings technical advantages such as the possibility for faster charging and discharging of the battery, according to Stora Enso.
Read more about how Stora Enso does this here.