学位论文详细信息
Non-Aqueous Redox Flow Batteries: Active Species Stability and Cost Saving Design Concepts
Redox flow batteries;Nonaqueous;Metal coordination complex;Common ion exchange;Chemical Engineering;Engineering;Chemical Engineering
Fisher, SydneyKotov, Nicholas ;
University of Michigan
关键词: Redox flow batteries;    Nonaqueous;    Metal coordination complex;    Common ion exchange;    Chemical Engineering;    Engineering;    Chemical Engineering;   
Others  :  https://deepblue.lib.umich.edu/bitstream/handle/2027.42/140904/sydneyml_1.pdf?sequence=1&isAllowed=y
瑞士|英语
来源: The Illinois Digital Environment for Access to Learning and Scholarship
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【 摘 要 】

Non-aqueous redox flow batteries (NAqRFBs) have recently received considerable attention as promising high energy density grid-level energy storage devices. Despite many attractive features, NAqRFBs are still at an early stage of development and currently suffer from limited stability and high projected costs. Research described in this thesis aimed to progress NAqRFBs toward commercial viability through the development of structure-function relationships that facilitate the design of stable active species and the introduction of design strategies that significantly reduce the cost of these devices. The first section of this thesis focuses on the development of trends that relate active species structural features to solubility, electrochemistry (number of redox events, standard potentials, reversibility), and electrochemical stability. This work specifically focuses on tridentate metal coordination complexes as active species and ultimately identifies a promising nickel bipyridylimino isoindoline metal coordination complex with exceptional cycling stability (>200 cycles through 2e-). Taken as a whole, these results can be used to guide the future design of stable NAqRFBs. Combining the stability, solubility and electrochemical trends will allow for the rapid identification and characterization of promising active species. The second section of this thesis discusses design strategies for increasing the viability of NAqRFBs. A compatibility analysis is established to design NAqRFBs that employ active species with either single or unbalanced redox events. Further, the concept of common ion exchange NAqRFBs is introduced as a route for decreasing the use of expensive supporting salts. Using these concepts, a proof-of-concept NAqRFB employing iron (II) tris(2,2’-bypridine) tetrafluoroborate and ferrocenylmethyl dimethyl ethyl ammonium tetrafluoroborate as the anolyte and catholyte, respectively, is designed and cycled in the complete absence of supporting salt. A techno-economic analysis demonstrates that this NAqRFB configuration provides savings of >$100/kWh over traditional cells employing high concentrations of supporting salt. These concepts offer a viable route for significant cost savings and can easily be extended to other promising redox chemistries to facilitate the development of stable, soluble, multi-electron NAqRFBs.

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