Batteries Made From Wood Industry By-Products
Fraunhofer researchers are developing sodium-ion batteries using lignin, a by-product of the wood industry, aiming to reduce reliance on critical raw materials.
Fraunhofer Institute researchers are developing a new type of sodium-ion battery utilizing lignin, a by-product from the wood and pulp industry. The initiative aims to create cost-effective, safe, and resource-efficient energy storage solutions, reducing dependence on critical raw materials like lithium and cobalt.
Lignin, a biopolymer present in wood, is typically burned for energy. In the "ThüNaBsE" project (Thuringia Sodium-Ion Battery for Scalable Energy Storage), researchers are converting lignin into hard carbon through thermal processes. This carbon serves as the negative electrode material for the batteries. Partners include Fraunhofer IKTS and the Friedrich Schiller University Jena, alongside regional industrial companies.
The developed hard carbon from lignin demonstrates suitability for reversible sodium-ion storage, offering high electrochemical performance and good cycle stability. The positive electrode utilizes Prussian Blue analogs, non-toxic iron compounds known for their availability and environmental compatibility.
This research pursues a more sustainable battery technology by using locally sourced, renewable materials. Prototype cells are currently under construction and testing at Fraunhofer IKTS facilities.