Advanced Materials for Energy Conversion and Storage 2022: Energy Conversion and Storage MIX I
Sponsored by: TMS Functional Materials Division, TMS: Energy Conversion and Storage Committee
Program Organizers: Jung Choi, Pacific Northwest National Laboratory; Soumendra Basu, Boston University; Paul Ohodnicki, University of Pittsburgh; Partha Mukherjee, Purdue University; Surojit Gupta, University of North Dakota; Amit Pandey, Lockheed Martin Space; Kyle Brinkman, Clemson University
Monday 8:30 AM
February 28, 2022
Location: Anaheim Convention Center
Session Chair: Jung Pyung Choi, Pacific Northwest National Laboratory
8:30 AM Introductory Comments
8:35 AM Keynote
Designing Electrode Architectures across Length Scales: Some Lessons Learned from Li-ion and “Beyond Li” Chemistries: Sarbajit Banerjee1; 1Texas A&M University
The design and operation of rechargeable batteries is predicated on orchestrating flows of mass, charge, and energy across multiple interfaces. I will discuss our efforts to develop an Angstrom-level view of diffusion pathways using a combination of single-crystal X-ray diffraction and density functional theory calculations. I will emphasize mitigation of diffusion impediments through: (a) utilization of Riemannian manifolds as a geometric design principle for electrode architectures and (b) the atomistic design of polymorphs with well-defined diffusion pathways that provide frustrated coordination. The latter approach, involving navigating metastable phase space, holds opportunities for non-equilibrium structural motifs and ultimately for the realization of novel function. Using binary, ternary, and quaternary oxides of vanadium, as illustrative examples where topochemical synthetic strategies have unveiled novel polymorphs, I will highlight the tunability of electronic structure, the potential richness of energy landscapes, and the implications for discovering promising intercalation hosts for both multivalent and anion batteries.
9:10 AM Keynote
Development of Solid Oxide Cell and Stack Technologies at Nexceris: From Fuel Cells to Electrolyzers and Reversible Operation: Emir Dogdibegovic1; Gene Arkenberg1; David Kopechek1; Anila Wallace1; Scott Swartz1; 1Nexceris
Over the past several years Nexceris has advanced its solid oxide cell and stack technologies through innovations in materials, design, and operation. In this talk, development of cells, stack components and stacks will be discussed. Lightweight SOFC stacks operate at high current density (0.5 -0.7 A/cm2) and high fuel utilization (70 – 80 %) leveraging patented FlexCell planar cell design, internal reforming capability, and tolerance to sulfur impurities in military logistic fuels. SOEC cells with downselected electrode sets provide current density over -1.5 A/cm2 at 1.3 V and 800 °C with 75% steam/25% hydrogen fuel and air as oxidant. The promising electrodes were implemented into short stacks and operated continuously in SOEC mode at ~1.3 V for ≥ 500 hours with <0.5%/kh degradation and improving. RSOC tests were recently initiated with dynamic operation between the two operating regimes. Nexceris’ ChromLok coatings for bipolar plates were integrated to enhance stack durability.
Effect of Transition Metal Doping on the Electrochemical Properties of B-site Doped Neodymium Nickelate for Reversible Solid Oxide Cells: Ayesha Akter1; Srikanth Gopalan1; 1Boston University
Ruddlesden-Popper structures based on rare-earth nickelates are promising oxygen electrode materials due to their mixed ionic-electronic conductivity, high oxygen surface exchange and diffusion coefficients, good thermo-chemical stability and well-matched thermal expansion coefficients. However, B-site doping can further enhance oxygen surface exchange and transport in these materials through their influence on the defect chemistry of these materials, particularly the oxygen non-stoichiometry. In this work, transition metals (Co, Cu) have been doped into chosen rare-earth nickelate oxides, and effect of dopant concentration and its influence on electrode polarization has been studied using symmetrical cells. The best electrodes identified using symmetrical cells have been used as oxygen electrodes in complete reversible fuel cell/electrolyzer cells to examine their mode switching behavior. Distributed relaxation times (DRT) analysis of the impedance spectra has been conducted to obtain insights into reaction mechanisms and the rate limiting steps.
10:05 AM Keynote
NOW ON-DEMAND ONLY - High Energy Density Batteries for Vehicle Electrification: Gayatri Dadheech1; 1GM
Electric vehicles with high energy density Li ion batteries show great promise and are revolutionizing the automotive industry. The success of lithium ion batteries would largely depend on its component material properties in order to achieve high energy, power, cycle life, abuse tolerance and cost. In this talk, we would discuss the developments and challenges of high capacity electrode materials and the potential surface engineering approaches to overcome them.