We published two new papers on our battery research in December! The first paper, published in Chem. Commun. introduces a new process to form an inorganic-organic hybrid solid electrolyte by Molecular Layer Deposition (MLD), which is an organic analog to ALD. The films are well-behaved as solid electrolytes, with an ionic conductivity of ~5×10-8 S/cm, and a transference number of ~1. The second paper, published in Adv. Energy Mater. demonstrates a scalable pathway to overcome energy/power density tradeoffs in Li-ion batteries by blending graphite and hard carbon active materials in the anode. This eliminates Li plating, and improves the homogeneity of the reaction through the anode volume, enabling efficient fast-charging at 6C rates.
Our paper “Area-Selective Atomic Layer Deposition Patterned by Electrohydrodynamic-Jet Printing for Additive Manufacturing of Functional Materials and Devices” is published in ACS Nano. We demonstrate that E-jet printing of polymers with sub-micrometer linewidths (down to 312nm) can be used to block ALD deposition with sub-nm precision in the z-direction, representing a new additive nanomanufacturing platform. This is a collaborative paper with the Barton and Peterson research groups at UM. [link]
Clare Lanaghan and Daniel Liao join the group as Ph.D. students. Welcome!
Our paper “Rational Design of Transparent Nanowire Architectures with Tunable Geometries for Preventing Marine Fouling” is published in Advanced Materials Interfaces. By tuning nanowire length, spacing, and branching, we systematically study the impact of surface architectures on wettability, algae fouling, and optical transparency. Superhydrophobic nanowire arrays completely block marine biofouling for 22 days. [link]
Our paper “Efficient Fast-Charging of Lithium-ion Batteries Enabled by Laser-Patterned Three-Dimensional Graphite Anode Architectures” is published in Journal of Power Sources as a part of the Special Issue celebrating the 2019 Nobel Prize in Chemistry for Li-ion Batteries. We demonstrate 4-6C fast charging in >2Ah pouch cells, with ~90% capacity retention after >500 cycles, which is enabled by 3-D graphite architectures. These metrics meet both the DOE and USABC targets for fast charging of EV batteries. [link]
Our paper “High-Performance Zinc Tin Oxide TFTs with Active Layers Deposited by Atomic Layer Deposition” is published in Advanced Electronic Materials. We demonstrate the highest reported mobility to date in ALD ZTO films, which is enabled by a combination of plasma and thermal. ALD. [link]
Neil was promoted to the rank of Associate Professor of Mechanical Engineering, with Tenure by the Regents of the University of Michigan [news story]
Neil has been selected by the University of Michigan College of Engineering for designation as a Miller Faculty Scholar. Faculty Scholar is an honorary title awarded to a small group of the most accomplished assistant and associate professors in the College of Engineering. [news article]
Our paper “Electro-Chemo-Mechanical Evolution of Sulfide Solid Electrolyte/Li Metal Interfaces: Operando Analysis and ALD Interlayer Effects” is published in Journal of Materials Chemistry A. We utilize a multi-modal suite of operando methods to study effects of artifical SEI layers deposited by ALD on LGPS solid electrolytes. The study highlights the critical role of mechanical properties on the dynamic evolution of the interphase(s) present. [link]
Our new paper “Li Penetration in Ceramic Solid Electrolytes: Operando Microscopy Analysis of Morphology, Propagation, and Reversibility” is published in Matter. We demonstrate 1) Multiple morphologies of Li penetration are observed; 2) The Li within these structures can be reversibly cycled; 3) The most common Li filaments propagate by a mechanical crack-opening mechanism; 4) The dynamic evolution of filament morphology can be correlated to voltage signatures. [link]