ZnS coating of cathode facilitates lean‐electrolyte Li‐S batteries
Abstract Tremendous effort has been devoted to lithium‐sulfur batteries, where flooded electrolytes have been employed ubiquitously. The use of lean electrolytes albeit indispensable for practical applications often causes low capacity and fast capacity fading of the sulfur cathode; thus, the electr...
| Main Authors: | , , |
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| Format: | Article |
| Language: | English |
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Wiley
2019-12-01
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| Series: | Carbon Energy |
| Subjects: | |
| Online Access: | https://doi.org/10.1002/cey2.10 |
| _version_ | 1818835864381292544 |
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| author | Woochul Shin Jun Lu Xiulei Ji |
| author_facet | Woochul Shin Jun Lu Xiulei Ji |
| author_sort | Woochul Shin |
| collection | DOAJ |
| description | Abstract Tremendous effort has been devoted to lithium‐sulfur batteries, where flooded electrolytes have been employed ubiquitously. The use of lean electrolytes albeit indispensable for practical applications often causes low capacity and fast capacity fading of the sulfur cathode; thus, the electrolyte/sulfur active mass ratios below 5 µL/mg have been rarely reported. Herein, we demonstrate that ZnS coating transforms sulfur cathode materials electrolyte‐philic, which tremendously promotes the performance in lean electrolytes. The ZnS‐coated Li2S@graphene cathode delivers an initial discharge capacity of 944 mAh/g at an E/S ratio of 2 µL/mg at the active mass loading of 5.0 mg Li2S/cm2, corresponding to an impressive specific energy of 500 Wh/kg based on the mass of cathode, electrolyte, and the assumed minimal mass of lithium metal anode. Density functional theory calculations reveal strong binding between ZnS crystals and electrolyte solvent molecules, explaining the better wetting properties. We also demonstrate the reversible cycling of a hybrid cathode of ZnS‐coated Li2S@graphene mixed with VS2 as an additive at an E/AM (active mass) ratio of 1.1 µL/mg, equivalent to the specific energy of 432 Wh/kg on the basis of the mass of electrodes and electrolyte. |
| first_indexed | 2024-12-19T02:57:29Z |
| format | Article |
| id | doaj.art-12c6fd1c8b244e389e81eed66ba266c2 |
| institution | Directory Open Access Journal |
| issn | 2637-9368 |
| language | English |
| last_indexed | 2024-12-19T02:57:29Z |
| publishDate | 2019-12-01 |
| publisher | Wiley |
| record_format | Article |
| series | Carbon Energy |
| spelling | doaj.art-12c6fd1c8b244e389e81eed66ba266c22022-12-21T20:38:18ZengWileyCarbon Energy2637-93682019-12-011216517210.1002/cey2.10ZnS coating of cathode facilitates lean‐electrolyte Li‐S batteriesWoochul Shin0Jun Lu1Xiulei Ji2Department of Chemistry Oregon State University Corvallis OregonChemical Sciences and Engineering Division Argonne National Laboratory Lemont IllinoisDepartment of Chemistry Oregon State University Corvallis OregonAbstract Tremendous effort has been devoted to lithium‐sulfur batteries, where flooded electrolytes have been employed ubiquitously. The use of lean electrolytes albeit indispensable for practical applications often causes low capacity and fast capacity fading of the sulfur cathode; thus, the electrolyte/sulfur active mass ratios below 5 µL/mg have been rarely reported. Herein, we demonstrate that ZnS coating transforms sulfur cathode materials electrolyte‐philic, which tremendously promotes the performance in lean electrolytes. The ZnS‐coated Li2S@graphene cathode delivers an initial discharge capacity of 944 mAh/g at an E/S ratio of 2 µL/mg at the active mass loading of 5.0 mg Li2S/cm2, corresponding to an impressive specific energy of 500 Wh/kg based on the mass of cathode, electrolyte, and the assumed minimal mass of lithium metal anode. Density functional theory calculations reveal strong binding between ZnS crystals and electrolyte solvent molecules, explaining the better wetting properties. We also demonstrate the reversible cycling of a hybrid cathode of ZnS‐coated Li2S@graphene mixed with VS2 as an additive at an E/AM (active mass) ratio of 1.1 µL/mg, equivalent to the specific energy of 432 Wh/kg on the basis of the mass of electrodes and electrolyte.https://doi.org/10.1002/cey2.10electrolyte‐philiclean electrolyteLi2S cathodelithium‐sulfur batteryZnS coating |
| spellingShingle | Woochul Shin Jun Lu Xiulei Ji ZnS coating of cathode facilitates lean‐electrolyte Li‐S batteries Carbon Energy electrolyte‐philic lean electrolyte Li2S cathode lithium‐sulfur battery ZnS coating |
| title | ZnS coating of cathode facilitates lean‐electrolyte Li‐S batteries |
| title_full | ZnS coating of cathode facilitates lean‐electrolyte Li‐S batteries |
| title_fullStr | ZnS coating of cathode facilitates lean‐electrolyte Li‐S batteries |
| title_full_unstemmed | ZnS coating of cathode facilitates lean‐electrolyte Li‐S batteries |
| title_short | ZnS coating of cathode facilitates lean‐electrolyte Li‐S batteries |
| title_sort | zns coating of cathode facilitates lean electrolyte li s batteries |
| topic | electrolyte‐philic lean electrolyte Li2S cathode lithium‐sulfur battery ZnS coating |
| url | https://doi.org/10.1002/cey2.10 |
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