October 14, 2007 - More rapid growth will be seen for polymers and carbon/graphite materials, which are used in fast-growing lithium and Ni-MH battery chemistries as well as fuel cells. Active materials are the leading functional outlet, constituting more than half of materials demand in 2006, but will experience below-average increases in demand. BATTERY & FUEL CELL MATERIALS OVERVIEW General Demand by Type Demand by Function Demand by Application IV.