Publications

Showing 9 results for Author: Andrew M. Ullman

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Aug, 2026

Journal

A structural and electrochemical study of perfluoropolyether-poly(ethylene oxide) solid polymer electrolytes

Solid polymer electrolytes offer attractive safety, processability, and interfacial adhesion for enabling high–energy solid-state lithium batteries, but they are often limited by narrow oxidative stability windows and low lithium-ion transference numbers. In an attempt to broaden the electrochemical stability window and increase lithium-ion transference number of poly(ethy…
Aug, 2026

Journal

Comparison of Li3InxY(1−x)Cl6 Solid Electrolytes Synthesized by Mechanochemical and Water-Based Methods for All-Solid-State Batteries

Halide solid electrolytes (HSE) have shown remarkable stability against high-voltage cathodes. Some HSE, such as Li3InCl6 (LIC), can be readily synthesized via aqueous routes. Here, we expand the aqueous synthesis of LIC to include Y substitution, which has different hydration coordination strengths, to form Li3InxY1-xCl6 (LIYC, 0≤x≤1). This composition is intended to comb…
Mar, 2026

Journal

Understanding the Influence of Chain Architecture on the Transport Quantities of Polymer Electrolytes with Covalently Bonded Anions

We use a combination of experiments and coarse-grained molecular dynamics simulations to elucidate the structure–property relationships in polymer electrolytes obtained by the copolymerization of poly(vinyl ethylene carbonate─lithium styrene bis(trifluoromethanesulfonyl)imide) or p(VEC-LiSTFSI). Experiments show that the conductivity reduces with increasing anion (i.e., ST…
Dec, 2025

Journal

Decoupling the capacity fade contributions in polymer electrolyte-based high-voltage solid-state batteries

Polymer electrolyte (PE)-based solid-state batteries (PE-SSBs) made with high-voltage cathodes are known to suffer from severe capacity fade, stemming primarily from the poor oxidative stability of most PEs under high-voltage cycling conditions. PEs also suffer from greater ion-transport limitations compared to liquid or solid electrolytes. However, often, these limitation…
Aug, 2025

Journal

Direct Prelithiation of Silicon-Based Composite Electrodes via Island-like Thermal Evaporation

Irreversible losses of Li during solid electrolyte interface (SEI) conditioning in batteries are a key contributor to the lower specific capacities observed in silicon-containing Li-ion batteries. Herein, thermal evaporation of between 1 and 20 μm of Li onto Si-based composite anodes has been investigated as a prelithiation method to compensate for such losses. Additionall…
Apr, 2025

Journal

Factors modulating the hydrolysis of Nylon-6,6 by a nylon hydrolase enzyme

The enzymatic hydrolysis of polyamides offers a promising approach to reduce the environmental impact of chemical recycling by enabling lower reaction temperatures, eliminating toxic organic solvents, and enhancing product selectivity. Achieving this goal will require increasing the low overall yield of enzymatic hydrolysis. In this work, we studied the mechanism of hydrol…
Dec, 2024

Journal

Pathway to High Rate Capability in Interconnected Composite Electrolytes: A Case Study with a Single-Ion-Conducting Polymer

In a three-dimensional interconnected polymer/ceramic composite electrolyte (3D composite), both the polymer and ceramic electrolyte phases are individually connected with a polymer-rich surface layer to provide conformal contact with the electrodes. This work investigates how the transference number of the polymer phase affects the electrochemical properties of the 3D com…
Sep, 2024

Journal

Densification Pressure Optimization of MOF-808-Based Membranes for Lithium Metal Batteries

The use of metal–organic frameworks (MOFs) in hybrid electrolytes for lithium (Li) metal batteries has grown in prominence in recent years, primarily due to the chemical tunability of the MOF’s pore structures, which can directly influence Li–ion transport properties. The most attractive form factor for a MOF electrolyte is a thin, flexible membrane, which requires the app…
Apr, 2024

Journal

Phase change electrolytes for combined electrochemical and thermal energy storage

Inorganic salt-based phase change materials (PCMs) form the basis of next-generation thermal energy storage technologies that store and release energy at temperatures relevant for regulating energy usage in residential environments. Here, we detail a rational approach for designing a multifunctional electrolyte that stores latent heat using polymer-stabilized sodium sulfat…

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Publications

A structural and electrochemical study of perfluoropolyether-poly(ethylene oxide) solid polymer electrolytes

Comparison of Li3InxY(1−x)Cl6 Solid Electrolytes Synthesized by Mechanochemical and Water-Based Methods for All-Solid-State Batteries

Understanding the Influence of Chain Architecture on the Transport Quantities of Polymer Electrolytes with Covalently Bonded Anions

Decoupling the capacity fade contributions in polymer electrolyte-based high-voltage solid-state batteries

Direct Prelithiation of Silicon-Based Composite Electrodes via Island-like Thermal Evaporation

Factors modulating the hydrolysis of Nylon-6,6 by a nylon hydrolase enzyme

Pathway to High Rate Capability in Interconnected Composite Electrolytes: A Case Study with a Single-Ion-Conducting Polymer

Densification Pressure Optimization of MOF-808-Based Membranes for Lithium Metal Batteries

Phase change electrolytes for combined electrochemical and thermal energy storage