Light-Weight FreeStanding Carbon Nanotube-Silicon Films for Anodes of Lithium Ion Batteries

ecause of their high energy and power density, lithium ion batteries that were mainly used for portable electronics are now extending to large ap-plications such as power tools and vehicle electrification. Extensive research has been carried out to find new electrode materials and new electrode structure designs to im-prove energy densities for both anode and cathode. Silicon as an anodematerial has at-tracted extensive research because it has the highest known capacity, more than 10 times the value of the current commercial graphite anode. However, the intrinsic vol-ume expansion and contraction of Si durin