التفاصيل البيبلوغرافية
| العنوان: |
Sulfur-functionalized mesoporous carbons as sulfur hosts in Li-S batteries: increasing the affinity of polysulfide intermediates to enhance performance. |
| المؤلفون: |
See KA; Mitsubishi Chemical Center for Advanced Materials, ‡Department of Chemistry and Biochemistry, §Materials Research Laboratory, and #Materials Department, University of California , Santa Barbara, California 93106, United States., Jun YS, Gerbec JA, Sprafke JK, Wudl F, Stucky GD, Seshadri R |
| المصدر: |
ACS applied materials & interfaces [ACS Appl Mater Interfaces] 2014 Jul 23; Vol. 6 (14), pp. 10908-16. Date of Electronic Publication: 2014 Feb 13. |
| نوع المنشور: |
Journal Article; Research Support, U.S. Gov't, Non-P.H.S. |
| اللغة: |
English |
| بيانات الدورية: |
Publisher: American Chemical Society Country of Publication: United States NLM ID: 101504991 Publication Model: Print-Electronic Cited Medium: Internet ISSN: 1944-8252 (Electronic) Linking ISSN: 19448244 NLM ISO Abbreviation: ACS Appl Mater Interfaces Subsets: PubMed not MEDLINE |
| أسماء مطبوعة: |
Original Publication: Washington, D.C. : American Chemical Society |
| مستخلص: |
The Li-S system offers a tantalizing battery for electric vehicles and renewable energy storage due to its high theoretical capacity of 1675 mAh g(-1) and its employment of abundant and available materials. One major challenge in this system stems from the formation of soluble polysulfides during the reduction of S8, the active cathode material, during discharge. The ability to deploy this system hinges on the ability to control the behavior of these polysulfides by containing them in the cathode and allowing for further redox. Here, we exploit the high surface areas and good electrical conductivity of mesoporous carbons (MC) to achieve high sulfur utilization while functionalizing the MC with sulfur (S-MC) in order to modify the surface chemistry and attract polysulfides to the carbon material. S-MC materials show enhanced capacity and cyclability trending as a function of sulfur functionality, specifically a 50% enhancement in discharge capacity is observed at high cycles (60-100 cycles). Impedance spectroscopy suggests that the S-MC materials exhibit a lower charge-transfer resistance compared with MC materials which allows for more efficient electrochemistry with species in solution at the cathode. Isothermal titration calorimetry shows that the change in surface chemistry from unfunctionalized to S-functionalized carbons results in an increased affinity of the polysulfide intermediates for the S-MC materials, which is the likely cause for enhanced cyclability. |
| تواريخ الأحداث: |
Date Created: 20140215 Date Completed: 20150409 Latest Revision: 20140723 |
| رمز التحديث: |
20231215 |
| DOI: |
10.1021/am405025n |
| PMID: |
24524220 |
| قاعدة البيانات: |
MEDLINE |
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