428976 SnO2/Carbon Nanotube–Infiltrated Ni Nanofoams As 3D Anodes for Enhanced Performance of Lithium-Ion Batteries

Tuesday, November 10, 2015: 9:50 AM
251F (Salt Palace Convention Center)
Marissa Follette1, Daniel R. Huffman2, Jennifer Carpena2, Michael F. Durstock2, Benji Maruyama2 and Placidus B. Amama1, (1)Department of Chemical Engineering, Kansas State University, Manhattan, KS, (2)Materials and Manufacturing Directorate, Air Force Research Laboratory, Wright-Patterson Air Force Base, OH

Metallic nanofoams have been widely investigated as 3D current collectors in lithium-ion batteries (LIBs) due to their high stability and mechanical robustness, as well as the highly conductive 3D framework that can be coated with high-capacity anode materials. However, the extremely high porosities (> 99%) and low specific surface areas (< 10 m2/g) of metallic nanofoams, limits the amount of active electrode material that can be deposited, thus reducing the maximum achievable areal energy density. Although the weight penalty associated with metallic nanofoams is a disadvantage, their highly conductive interconnected fibers and high void fraction could be exploited for improved LIB performance by infiltrating the nanofoam with a highly conductive, low-density material such as carbon nanotubes (CNTs). Here, we report for the first time, an efficient and scalable gas-phase liquid injection CVD approach using a ferocene/xylene mixture for the infiltration of arrays of high-quality CNTs in pretreated Ni nanofoam. Importantly, the BET specific surface area of the pretreated Ni nanofoam after CNT infiltration increases by a factor of over 20. Further, upon deposition of SnO2 on the CNT-infiltrated Ni nanofoams by atomic layer deposition, the new nanocomposites showed improved energy capacity and excellent rate capability, as well as high capacity retention during electrochemical charge-discharge measurements.

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See more of this Session: Nanomaterials for Energy Storage I
See more of this Group/Topical: Topical Conference: Nanomaterials for Energy Applications