A number of electrochemical systems have been reported where chemical redox reactions take place between dissolved electroactive species (e.g., redox shuttles) and solid electroactive materials. These chemical redox processes can also be coupled to an electrochemical process. Examples of applications/systems include the use of dissolved redox shuttles for overcharge protection of lithium-ion batteries, redox mediated flow batteries where redox shuttles provide power in an electrochemical flow cell and then are chemically reacted with solid electroactive material to extend the duration of discharge of the system, and battery recycling processes where redox shuttles are used to extract cations from the solid phase electroactive material. While such systems and applications have show promise, much more remains to be understood about principles and best practices for designing these systems.<br/><br/>In this talk, in situ characterization of chemical redox between dissolved redox shuttles and solid electroactive lithium-ion battery material particles will be described. Electrochemical methods will be used to track the overall progression of the redox reactions under relevant operating conditions. In addition, initial results for in situ characterization of the same chemical redox reaction using neutron imaging will be discussed. While the electrochemical analysis enables real time tracking of the overall reaction progression, the use of neutron imaging enables probing the spatial distribution of the reaction progression. These tools can be used for active monitoring of the progression of the chemical redox process both space and time to provide insights into rate limiting processes.

In situ characterization of chemical redox of a lithium-ion battery material

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