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Title: Encapsulating Various Sulfur Allotropes within Graphene Nanocages for Long‐Lasting Lithium Storage

Journal Article · · Advanced Functional Materials
 [1];  [2];  [3]; ORCiD logo [2];  [4];  [2];  [4];  [5];  [4];  [6]
  1. Chemical Sciences and Engineering Division Argonne National Laboratory Argonne IL 60439 USA, Department of Mechanical and Industrial Engineering University of Illinois at Chicago Chicago IL 60607 USA
  2. Chemical Sciences and Engineering Division Argonne National Laboratory Argonne IL 60439 USA
  3. Center for Nanoscale Materials Argonne National Laboratory Argonne IL 60439 USA
  4. X‐ray Science Division Argonne National Laboratory Argonne IL 60439 USA
  5. Department of Mechanical and Industrial Engineering University of Illinois at Chicago Chicago IL 60607 USA
  6. Chemical Sciences and Engineering Division Argonne National Laboratory Argonne IL 60439 USA, Institute for Research and Medical Consultations Imam Abdulrahman Bin Faisal University Dammam 34212 Saudi Arabia

Abstract The encapsulation of sulfur within carbon matrices is widely utilized in the cathode of a rechargeable lithium–sulfur battery, whose energy density largely depends on the design of the carbon structure. Here, an advanced graphene nanocage structure with the capability of hosting both cyclo‐S 8 and smaller sulfur molecules (S 2–4 ) is reported. The cage inner cavity is partially filled with S 8 to form a yolk–shell structure that enables free volumetric variation of S 8 during (de)lithiation. In the graphene shell of the cage, S 8 are downsized to S 2–4 to activate extra sulfur loading sites within graphene layers. Importantly, the graphene shell exhibits inward volumetric variation upon (de)lithiation of the loaded S 2–4 , and the overall electrode strain is thus minimized. This prototyped design promises an ultimate solution to maximize sulfur loading in carbon matrices as well as to circumvent the polysulfide dissolution problem and boost the commercialization of lithium‐sulfur batteries in the future.

Sponsoring Organization:
USDOE
Grant/Contract Number:
AC02-06CH11357
OSTI ID:
1424524
Journal Information:
Advanced Functional Materials, Journal Name: Advanced Functional Materials Journal Issue: 38 Vol. 28; ISSN 1616-301X
Publisher:
Wiley Blackwell (John Wiley & Sons)Copyright Statement
Country of Publication:
Germany
Language:
English

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