Somewhere between graphite and graphene there is graphite foam. The more complicated name for this material is ultrathin and ultra-light graphite foam (UGF) and it includes lithium iron phosphate (LFP). The UGF-LFP combination makes for a superior cathode in lithium batteries. Researchers at the University of Texas in Austin, where UGF is being developed, noted that a UGF-LFP cathode has 23% more conductive capacity than an Aluminum/LFP cathode – which is the variety most commonly used for this application (Nickel foil can also be used). UGF is also said to possess better electrochemical stability qualities when compared to Al and Ni foils, the most common varieties of conductive sub-strata in Li-ion batteries. UGF can be produced cheaply and easily and it corresponds well with most electrochemical materials. Scientists developing UGF said that the material has higher energy density than Aluminum or Nickel..
http://www.graphiteblog.com/2012/05/...-a-denser-lighter-battery.html