Xponential Battery Materials and SiCAM Technologies are teaming up to develop a silicon-sulfur battery platform for US battery OEMs. The design pairs SiCAM's silicon-carbon anode with XBM's lithium-sulfur cathode, aiming for higher energy density than conventional lithium-ion cells. Both companies emphasize US-based supply chains, using sulfur from petroleum refining and lignin from paper pulping as feedstocks. SiCAM uses a fluidized-bed CVD process with trichlorosilane to make its silicon-carbon anode, which it says helps manage silicon's 300% swelling during cycling. XBM's CarbonX cathode uses porous carbon made from lignin, infused with sulfur and catalysts. The initial target is lightweight eMobility applications like eVTOLs and drones, where energy density matters more than cost. The release does not include specific cycle life or energy density numbers, so the technology is still in an early stage. The main thing to watch is whether the anode and cathode can hold up together over many charge cycles outside of a lab.
