Introduction

An electrochemical system such as a rechargeable battery or a fuel cell relies on a chain of kinetic and transport processes, which occur and interact across many scales of size and distance. Our research program centers on electrochemical engineering, with an emphasis on the technological problems associated with energy storage and production. We aim to connect the microscopic perspective of the physical chemist with the macroscopic view of the device engineer.

Typical lithium-ion batteries convert chemical energy to electrical energy through reactions that insert or remove lithium from the crystal lattices of porous solids to induce electron exchange. The overall charge/discharge behavior of a battery cell depends on the crystal structure of the solid insertion compounds involved (angstrom scale), on lithium diffusion and intercalation through aggregated solid domains (nanometer scale), and on ionic conduction within electrode pores and the separator membrane (micrometer scale). These interdependent processes may also be accompanied by undesired side reactions, mechanical forces, and heat generation, all of which may degrade performance of the battery as a whole. Thus one of our current research thrusts is to build models that rationalize electrode instability, internal heat transfer, and material degradation in rechargeable lithium-ion or lithium-anode batteries.

Polymer-electrolyte or solid-oxide fuel cells involve similarly coupled processes, in which the flows of heat, electrical current, and mass occur simultaneously, and can impact each other on multiple scales and in various ways. The development of more sophisticated models for electrochemical systems mandates a parallel development of new theoretical methods, both to provide adequate predictive capability and to supply means by which material properties can be assessed without prohibitively large numbers of experiments. Another research thrust of our group is to extend techniques in the statistical mechanics of transport processes, which may allow macroscopic transport or thermodynamic properties to be deduced from molecular simulations.

Recent News

January, 2016

Howie Chu joined the group as a Visiting Researcher.

January, 2016

Gulin Vardar graduated with a Ph.D degree from the group.

January, 2016

Tianhong Hou and Priyamvada Goyal completed their Transfer of Status.

January, 2016

Prof. Monroe gave a talk, "Experimentally informed modelling of lithium/oxygen cells," at the Université de Picardie Jules Verne in Amiens, France.

November, 2015

Prof. Monroe gave a talk, "Electrothermal Modeling of Large-Format Prismatic LFP Cells," at the UK Energy Storage Conference in Birmingham, UK.

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Recent Publications

  • G. Vardar, E.G. Nelson, J.G. Smith, J. Naruse, H. Hiramatsu, B.M. Bartlett, A.E.S. Sleightholme, D.J. Siegel, C.W. Monroe, "Identifying the Discharge Product and Reaction Pathway for a Secondary Mg/O2 Battery," Chem. Mater. 27 (2015), 7564-7568.

  • M.D. Radin, C.W. Monroe, D.J. Siegel, "Impact of Space-Charge Layers on Sudden Death in Li/O2 Batteries," J. Phys. Chem. Lett 6 (2015), 3017-3022.

  • J. Liu, C.W. Monroe, "On the characterization of battery electrolytes with polarization cells," Electrochimica Acta 167 (2015), 357-363.

  • L.D. Griffith, A.E.S. Sleightholme, J.F. Mansfield, D.J. Siegel, C.W. Monroe, "Correlating Li/O2 Cell Capacity and Product Morphology with Discharge Current," ACS Appl. Mater. Interfaces 7 (2015), 7670-7678.

  • C.W. Monroe, D.R. Wheeler, J. Newman, "Nonequilibrium Linear Response Theory: Application to Onsager-Stefan-Maxwell Diffusion," Ind. Eng. Chem Res. 54 (2015), 4460-4467.

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