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| Content Provider | World Health Organization (WHO)-Global Index Medicus |
|---|---|
| Author | Pande, Vikram Mccloskey, Bryan D. Burke, Colin M. Viswanathan, Venkatasubramanian Khetan, Abhishek |
| Description | Author Affiliation: Burke CM ( Department of Chemical and Biomolecular Engineering, University of California, Berkeley, CA 94720); Pande V ( Department of Mechanical Engineering, Carnegie Mellon University, Pittsburgh, PA 15213); Khetan A ( Institute for Combustion Technology, Rheinisch-Westfälische Technische Hochschule Aachen, 52056 Aachen, Germany.); Viswanathan V ( Department of Mechanical Engineering, Carnegie Mellon University, Pittsburgh, PA 15213); McCloskey BD ( Department of Chemical and Biomolecular Engineering, University of California, Berkeley, CA 94720); |
| Abstract | Among the “beyond Li-ion” battery chemistries, nonaqueous $Li–O_{2}$ batteries have the highest theoretical specific energy and, as a result, have attracted significant research attention over the past decade. A critical scientific challenge facing nonaqueous $Li–O_{2}$ batteries is the electronically insulating nature of the primary discharge product, lithium peroxide, which passivates the battery cathode as it is formed, leading to low ultimate cell capacities. Recently, strategies to enhance solubility to circumvent this issue have been reported, but rely upon electrolyte formulations that further decrease the overall electrochemical stability of the system, thereby deleteriously affecting battery rechargeability. In this study, we report that a significant enhancement (greater than fourfold) in $Li–O_{2}$ cell capacity is possible by appropriately selecting the salt anion in the electrolyte solution. Using $^{7}Li$ NMR and modeling, we confirm that this improvement is a result of enhanced $Li^{+}$ stability in solution, which, in turn, induces solubility of the intermediate to $Li_{2}O_{2}$ formation. Using this strategy, the challenging task of identifying an electrolyte solvent that possesses the anticorrelated properties of high intermediate solubility and solvent stability is alleviated, potentially providing a pathway to develop an electrolyte that affords both high capacity and rechargeability. We believe the model and strategy presented here will be generally useful to enhance Coulombic efficiency in many electrochemical systems (e.g., Li–S batteries) where improving intermediate stability in solution could induce desired mechanisms of product formation. |
| ISSN | 00278424 |
| e-ISSN | 10916490 |
| Journal | Proceedings of the National Academy of Sciences of the United States of America |
| Issue Number | 30 |
| Volume Number | 112 |
| Language | English |
| Publisher | National Academy of Sciences |
| Publisher Date | 2015-07-01 |
| Publisher Place | United States |
| Access Restriction | Open |
| Subject Keyword | Multidisciplinary |
| Content Type | Text |
| Resource Type | Article |
| Subject | Multidisciplinary |
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