Nanomaterials for implantable batteries to power cardiac devices,  · Nanomaterials for implantable batteries to power cardiac devices T. Zhang a,Z.Lia, W. Hou b,Y.Yanga, * a Department of Applied Physics and Applied Mathematics, Columbia University, New York, NY, 10025, USA b National United Engineering Laboratory for Biomedical Material Modification, Dezhou, Shandong, 251100, ChinaNanoball batteries,  · Nanoball batteries are an experimental type of battery with either the cathode or anode made of nanosized balls that can be composed of various materials such as carbon and lithium iron phosphate. Batteries which use nanotechnology are more capable than regular batteries because of the vastly improved surface area which allows for greater electrical performance, such as fast charging and ...api.researchmap.jp, Our results indicate that a low bulk density of rGO facilitates defect annealing, yielding high-quality carbon with 99.3 wt% purity, oxidative resistance as high as graphite powder, and an electrical conductivity of 36,000 S m -1 in the compressed powder form.