High-yield synthesis of “floating” three-dimensional carbon nanofiber mats using controllable substrate-catalyst detachment

E. Shawat, I. Perelshtein, C.L. Pint, G.D. Nessim
Bar-Ilan university, IL

Keywords: caron nanofibers, CVD, catalyst, 3D

Summary:

We demonstrate a growth process to produce large-scale mats of densely packed carbon nanofiber (CNF) materials and demonstrate their utility as three-dimensional (3-D) anodes for lithium-ion batteries. Freestanding CNF mats are produced by the controlled delamination of Ni/Pd metal coatings that act as reservoirs to continuously supply metal catalyst to nucleate CNFs that support the 3-D mat structure. We also observe the choice of the support layer to play a role in the delamination process that enables morphological control on the CNF mats. Furthermore, we demonstrate the utility of this growth technique by utilizing these mats as anodes in lithium ion batteries. Unlike conventional carbon anodes, these electrodes can exhibit capacities on-par with conventional graphitic carbons in thick three-dimensional architectures due to the ability for metal ions to diffuse through the mat and intercalate into the CNFs. This effort demonstrates a technique where growth processes can directly be tuned to enable new materials for efficient electrochemical energy storage applications.