Bulletin of the American Physical Society
APS March Meeting 2013
Volume 58, Number 1
Monday–Friday, March 18–22, 2013; Baltimore, Maryland
Session M11: Invited Session: Polymer Electrolytes for Energy Storage |
Hide Abstracts |
Sponsoring Units: DPOLY Chair: Enrique Gomez, Pennsylvania State University Room: 310 |
Wednesday, March 20, 2013 8:00AM - 8:36AM |
M11.00001: Effect of Ion Clusters on Transport in Hydrated Block Copolymers Invited Speaker: Nitash Balsara Transport through hydrated membranes is important for a wide variety of applications including desalination, artificial photosynthesis, and hydrogen fuel cells. Model membranes for these applications can be created by self-assembly of block copolymers containing an ion-containing hydrophilic block and a nonionic hydrophobic block that provides the membrane with structural integrity in the hydrated state. The formation of ordered microdomains such as lamellae and cylinders in block copolymers is well-established. The ion-containing microdomains also contain nanoscale ionic aggregates. The talk will focus on the effect of morphology on transport of protons and hydroxide ions. We pay particular attention to the effect of clusters on ion transport. [Preview Abstract] |
Wednesday, March 20, 2013 8:36AM - 9:12AM |
M11.00002: New Approaches to Conjugated Polymer Electrodes for Organic Energy Storage Invited Speaker: Jodie Lutkenhaus Conjugated polymers have been explored as electrodes in batteries and pseudocapacitors for over 30 years. Yet, their widespread implementation has been hindered for several reasons such as oxidative stability, low capacity, and rate limitations associated with ionic mobility relative to current state-of-the-art. On the other hand, conjugated polymers have much to offer because of their good electronic conductivity, high Coulombic efficiency, and theoretical capacities comparable to those of metal oxides. Our lab's current goal is to overcome the aforementioned challenges, so that conjugated polymeric electrodes can be suitable used in energy storage for applications such as mechanically flexible energy storage and structural power system. This talk will present several approaches towards synthesis and processing of polyaniline that achieve oxidatively stable, high capacity, ionically mobile electrodes. These approaches include template polymerization, synthesis of nanofibers, and layer-by-layer assembly. [Preview Abstract] |
Wednesday, March 20, 2013 9:12AM - 9:48AM |
M11.00003: Ionomer Design, Synthesis and Characterization for Ion-Conducting Energy Materials Invited Speaker: Ralph H. Colby For ionic actuators and battery separators, it is vital to utilize single-ion conductors that avoid the detrimental polarization of other ions; the commonly studied dual-ion conductors simply will not be used in the next generation of materials for these applications. \textit{Ab initio} quantum chemistry calculations at 0 K in vacuum characterize ion interactions and ion solvation by various functional groups, allowing identification of constituents with weak interactions to be incorporated in ionomers for facile ion transport. Simple ideas for estimating the ion interactions and solvation at practical temperatures and dielectric constants are presented that indicate the rank ordering observed at 0 K in vacuum should be preserved. Hence, such \textit{ab initio} calculations are useful for screening the plethora of combinations of polymer-ion, counterion and polar functional groups, to decide which are worthy of synthesis for new ionomers. Single-ion conducting ionomers are synthesized based on these calculations, with low glass transition temperatures (facile dynamics) to prepare ion-conducting membranes for ionic actuators and battery separators. Characterization by X-ray scattering, dielectric spectroscopy, NMR and linear viscoelasticity collectively develop a coherent picture of ionic aggregation and both counterion and polymer dynamics. Examples are shown of how \textit{ab initio} calculations can be used to understand experimental observations of dielectric constant, glass transition temperature and conductivity of polymerized ionic liquids with counterions being either lithium, sodium, fluoride, hydroxide (for batteries) or bulky ionic liquids (for ionic actuators). [Preview Abstract] |
Wednesday, March 20, 2013 9:48AM - 10:24AM |
M11.00004: Thermodynamics of salt-doped polymers Invited Speaker: Zhen-Gang Wang There is much current interest in salt-doped polymers as materials for energy applications. For example, a promising system for rechargeable battery applications consists of diblock copolymers of an ion-dissolving block, such as polyethylene oxide (PEO) and a nonconducting block such as polystyrene. Experimentally, it has been shown that the addition of lithium salts significantly alters the order-order and order-disorder transition (ODT) temperatures. In particular, the ODT temperature can increase substantially upon adding even a small amount of lithium salt, and the domain spacing in the ordered phases also increases significantly. Both changes are found to depend on the anion type. In this talk, I describe a simple theory for explaining these phenomena. A key effect is the solvation energy of the anions by the polymers, which we approximate using the Born solvation model. The difference in the Born energy between different polymers provides a driving force towards phase separation. By studying the shift in the mean-field spinodal of the disordered phase, we can identify an effective $\chi$ parameter, with a systematic dependence on the anion radius, in agreement with available experimental data. Furthermore, by studying the behavior of the domain spacing with salt concentration, we clarify the relationship between different definitions of the effective $\chi$ parameter. We propose that the effective $\chi$ parameter determined from the structure factor of the disordered phase is a more robust measure of the change in miscibility between the two blocks. Finally, we demonstrate that salt doping induces a strongly first-order transition from the disordered phase to the lamellar phase, with different salt concentrations in the two phases. [Preview Abstract] |
Wednesday, March 20, 2013 10:24AM - 11:00AM |
M11.00005: Polymer Electrolytes Invited Speaker: Michel Armand |
Follow Us |
Engage
Become an APS Member |
My APS
Renew Membership |
Information for |
About APSThe American Physical Society (APS) is a non-profit membership organization working to advance the knowledge of physics. |
© 2024 American Physical Society
| All rights reserved | Terms of Use
| Contact Us
Headquarters
1 Physics Ellipse, College Park, MD 20740-3844
(301) 209-3200
Editorial Office
100 Motor Pkwy, Suite 110, Hauppauge, NY 11788
(631) 591-4000
Office of Public Affairs
529 14th St NW, Suite 1050, Washington, D.C. 20045-2001
(202) 662-8700