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Unraveling Shuttle Effect and Suppression Strategy in Lithium/Sulfur Cells by In Situ/Operando X-ray Absorption Spectroscopic Characterization

Journal Article · · Energy & Environmental Materials
DOI:https://doi.org/10.1002/eem2.12152· OSTI ID:1838431
 [1];  [2];  [1];  [3];  [4];  [5];  [5];  [5];  [2];  [6];  [7];  [5];  [4];  [5];  [5];  [4];  [5];  [5];  [4]
  1. Tsinghua Univ., Beijing (China); Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
  2. Chinese Academy of Sciences (CAS), Suzhou (China)
  3. Chinese Academy of Sciences (CAS), Shanghai (China)
  4. Tsinghua Univ., Beijing (China)
  5. Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
  6. State Key Laboratory of Low‐Dimensional Quantum Physics and Department of Physics Tsinghua University Beijing100084China
  7. Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States); Chinese Academy of Sciences (CAS), Shanghai (China)
The polysulfides shuttle effect represents a great challenge in achieving high capacity and long lifespan of lithium/sulfur (Li/S) cells. A comprehensive understanding of the shuttle-related sulfur speciation and diffusion process is vital for addressing this issue. Herein, we employed in situ/operando X-ray absorption spectroscopy (XAS) to trace the migration of polysulfides across the Li/S cells by precisely monitoring the sulfur chemical speciation at the cathodic electrolyte-separator and electrolyte-anode interfaces, respectively, in a real-time condition. After we adopted a shuttle-suppressing strategy by introducing an electrocatalytic layer of twinborn bismuth sulfide/bismuth oxide nanoclusters in a carbon matrix (BSOC), we found the Li/S cell showed greatly improved sulfur utilization and longer life span. The operando S K-edge XAS results revealed that the BSOC modification was bi-functional: trapping polysulfides and catalyzing conversion of sulfur species simultaneously. We elucidated that the polysulfide trapping-and-catalyzing effect of the BSOC electrocatalytic layer resulted in an effective lithium anode protection. Finally, our results could offer potential stratagem for designing more advanced Li/S cells.
Research Organization:
Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States)
Sponsoring Organization:
National Key R&D Program of China; National Natural Science Foundation of China (NSFC); USDOE Office of Science (SC), Basic Energy Sciences (BES)
Grant/Contract Number:
AC02-05CH11231
OSTI ID:
1838431
Journal Information:
Energy & Environmental Materials, Journal Name: Energy & Environmental Materials Journal Issue: 2 Vol. 4; ISSN 2575-0356
Publisher:
Wiley - Zhengzhou UniversityCopyright Statement
Country of Publication:
United States
Language:
English

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