Accession Number : ADA579429


Title :   Center for Alternative Energy Storage Research and Technology


Descriptive Note : Final rept. 25 Aug 2009 - 26 Dec 2011


Corporate Author : MICHIGAN STATE UNIV EAST LANSING


Personal Author(s) : Drzal, Lawrence T ; Sakamoto, Jeff


Full Text : https://apps.dtic.mil/dtic/tr/fulltext/u2/a579429.pdf


Report Date : 28 Mar 2013


Pagination or Media Count : 82


Abstract : Electrolytes, nano-structuring and graphene nanoplatelets for electrodes, and current collectors in batteries and supercapacitors were investigated. The following results were obtained: (1) Nano-structuring of graphene nanoplatelets with and without conductive polymers produced supercapacitors with very high specific capacitance (greater than 165 F/gm) and high frequency (greater than 150 Hz) response with low losses; (2) graphene nanoplatelet thin films can replace copper current collectors in energy storage devices and save weight approx. 80% and reduced cost; (3) a relationship between the RTIL type and structure, interfacial capacitance, electron-transfer kinetics and reaction mechanisms of outerand inner-sphere redox systems for sp2 and sp3 carbon electrodes was developed; (4) Reductions of internal resistance of supercapacitors and lithium ion batteries was achieved using silver nanorods 30-100nm in diameter, and approximately 200-300nm in length; (5) a new ceramic electrolyte membrane technology, based on LLZO has produced an unprecedented combination of high ionic conductivity (approx. 1mS/cm), and stability against Li and air; (6) infusion of graphene nanoplatelets into carbon aerogel improves both electrical conductivity and mechanical integrity; (7) New balancing and bypassing circuits can maintain the original rated voltage of battery packs even when individual cells fail; and (8) faulty battery performance can be detected using time-frequency representations such as wavelet transforms.


Descriptors :   *ENERGY STORAGE , CAPACITANCE , CAPACITORS , CIRCUITS , CONDUCTIVE POLYMERS , COSTS , ELECTRON TRANSFER , INTERFACES , KINETICS , LITHIUM BATTERIES , WAVELET TRANSFORMS


Subject Categories : Physical Chemistry
      Energy Storage


Distribution Statement : APPROVED FOR PUBLIC RELEASE