Nonaqueous vanadium disproportionation flow batteries with porous separators cycle stably and tolerate high current density
Vanadium acetylacetonate, or V(acac)3, provides a model chemistry for investigating the performance of nonaqueous disproportionation flow batteries. A flow reactor was developed to implement studies of efficiency, energy capacity, and power capability with respect to electrolyte flow rate and curren...
| Main Authors: | , |
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| Format: | Journal article |
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Elsevier
2018
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| _version_ | 1797056050522750976 |
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| author | Saraidaridis, J Monroe, C |
| author_facet | Saraidaridis, J Monroe, C |
| author_sort | Saraidaridis, J |
| collection | OXFORD |
| description | Vanadium acetylacetonate, or V(acac)3, provides a model chemistry for investigating the performance of nonaqueous disproportionation flow batteries. A flow reactor was developed to implement studies of efficiency, energy capacity, and power capability with respect to electrolyte flow rate and current density. Reactors incorporating a porous separator allowed V(acac)3 to be cycled without appreciable capacity fade at current densities up to 100 mAcm−2. Experiments at the lowest flow rate, 12.5 mLmin–1, revealed limitations imposed by residence time within the reactor, which manifested as high charging overpotentials. These overpotentials vanish above 25 mLmin–1. A higher flow rate of 50 mLmin–1 yielded performance similar to cells at 25 mLmin–1, but could improve performance at current densities above 100 mAcm−2. Extrapolation of power density's dependence on current suggests a maximum power of 0.22 Wcm−2 for cells run at 206 mAcm−2. Energy efficiency passes through a maximum of 71% at 40 mAcm−2 and the corresponding energy density suggests that the chemistry can, in principle, deliver above 13 WhL−1 in acetonitrile solutions and above 24 WhL−1 in mixed-solvent solutions with higher V(acac)3 solubility. A V(acac)3 cell run at 40 mAcm−2 is shown to exhibit stable capacity and performance for more than 150 cycles. |
| first_indexed | 2024-03-06T19:17:52Z |
| format | Journal article |
| id | oxford-uuid:1909ee22-d6df-47f9-8228-0def7c6bc53f |
| institution | University of Oxford |
| last_indexed | 2024-03-06T19:17:52Z |
| publishDate | 2018 |
| publisher | Elsevier |
| record_format | dspace |
| spelling | oxford-uuid:1909ee22-d6df-47f9-8228-0def7c6bc53f2022-03-26T10:46:41ZNonaqueous vanadium disproportionation flow batteries with porous separators cycle stably and tolerate high current densityJournal articlehttp://purl.org/coar/resource_type/c_dcae04bcuuid:1909ee22-d6df-47f9-8228-0def7c6bc53fSymplectic Elements at OxfordElsevier2018Saraidaridis, JMonroe, CVanadium acetylacetonate, or V(acac)3, provides a model chemistry for investigating the performance of nonaqueous disproportionation flow batteries. A flow reactor was developed to implement studies of efficiency, energy capacity, and power capability with respect to electrolyte flow rate and current density. Reactors incorporating a porous separator allowed V(acac)3 to be cycled without appreciable capacity fade at current densities up to 100 mAcm−2. Experiments at the lowest flow rate, 12.5 mLmin–1, revealed limitations imposed by residence time within the reactor, which manifested as high charging overpotentials. These overpotentials vanish above 25 mLmin–1. A higher flow rate of 50 mLmin–1 yielded performance similar to cells at 25 mLmin–1, but could improve performance at current densities above 100 mAcm−2. Extrapolation of power density's dependence on current suggests a maximum power of 0.22 Wcm−2 for cells run at 206 mAcm−2. Energy efficiency passes through a maximum of 71% at 40 mAcm−2 and the corresponding energy density suggests that the chemistry can, in principle, deliver above 13 WhL−1 in acetonitrile solutions and above 24 WhL−1 in mixed-solvent solutions with higher V(acac)3 solubility. A V(acac)3 cell run at 40 mAcm−2 is shown to exhibit stable capacity and performance for more than 150 cycles. |
| spellingShingle | Saraidaridis, J Monroe, C Nonaqueous vanadium disproportionation flow batteries with porous separators cycle stably and tolerate high current density |
| title | Nonaqueous vanadium disproportionation flow batteries with porous separators cycle stably and tolerate high current density |
| title_full | Nonaqueous vanadium disproportionation flow batteries with porous separators cycle stably and tolerate high current density |
| title_fullStr | Nonaqueous vanadium disproportionation flow batteries with porous separators cycle stably and tolerate high current density |
| title_full_unstemmed | Nonaqueous vanadium disproportionation flow batteries with porous separators cycle stably and tolerate high current density |
| title_short | Nonaqueous vanadium disproportionation flow batteries with porous separators cycle stably and tolerate high current density |
| title_sort | nonaqueous vanadium disproportionation flow batteries with porous separators cycle stably and tolerate high current density |
| work_keys_str_mv | AT saraidaridisj nonaqueousvanadiumdisproportionationflowbatterieswithporousseparatorscyclestablyandtoleratehighcurrentdensity AT monroec nonaqueousvanadiumdisproportionationflowbatterieswithporousseparatorscyclestablyandtoleratehighcurrentdensity |