Northwestern researchers have developed a novel technology for rechargeable lithium ion batteries. Abstract Their work enhances battery energy, power densities, cost, and cycling life for improved automobile and stationary power generation applications. They designed a novel class of composites of silicon (Si) nanoparticles that are highly dispersed between continuous graphene sheets and are supported by a 3D network of graphite. Because the graphite is reconstituted from graphene sheets, it provides high electrical conductivity throughout the electrode and exhibits superior mechanical integrity to anchor the more flexible graphene sheets that sandwich the Si nanoparticles. As a result, these features provide excellent lithium ion storage capacities and cycling stability. Using this technology, the researchers created an electrode with a storage capacity higher than 2200 mAh/g that decreased by 1% or less per cycle after 50 cycles were prepared.
|State||Published - May 12 2011|