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Title: Elucidating Polymer Binder Entanglement in Freestanding Sulfide Solid-State Electrolyte Membranes

Journal Article · · ACS Energy Letters
 [1]; ORCiD logo [2]; ORCiD logo [2];  [2];  [3]; ORCiD logo [4];  [4]; ORCiD logo [5];  [4]; ORCiD logo [2]
  1. Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States); Florida A & M University, Tallahassee, FL (United States); Florida State Univ., Tallahassee, FL (United States)
  2. Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)
  3. Freed-Hardeman Univ., Henderson, TN (United States)
  4. SLAC National Accelerator Laboratory (SLAC), Menlo Park, CA (United States)
  5. Florida A & M University, Tallahassee, FL (United States); Florida State Univ., Tallahassee, FL (United States)
+ Show Author Affiliations

This study advances the development of flexible, sheet-type sulfide solid-state electrolytes (SSEs) for use in all-solid-state batteries, emphasizing the important and previously insufficiently investigated role of polymer binder entanglement. Here, the molecular weight of polymer binders is pivotal in crafting robust, freestanding SSE films. Our research uncovers a dual impact: higher molecular weight binders bolster the structural integrity of SSE films but elevate grain boundary resistance and diminish critical current density, whereas lower molecular weight poly(isobutylene) films, despite their more uniform distribution, lack the essential strain hardening or strength for sustained active material contact. Crucially, full cells employing higher molecular weight binders demonstrate improved discharge capacity retention, contrasting sharply with the notable capacity degradation in lower molecular weight cells. Our findings not only deepen the comprehension of binder influences in solid-state batteries but also chart a course for refining all-solid-state battery technologies, a key stride for the future of energy storage solutions.

Research Organization:
Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)
Sponsoring Organization:
USDOE Office of Energy Efficiency and Renewable Energy (EERE), Office of Sustainable Transportation. Vehicle Technologies Office (VTO); USDOE Office of Energy Efficiency and Renewable Energy (EERE), Energy Efficiency Office. Advanced Materials & Manufacturing Technologies Office (AMMTO); USDOE Office of Science (SC), Basic Energy Sciences (BES). Scientific User Facilities (SUF)
Grant/Contract Number:
AC05-00OR22725
OSTI ID:
2376351
Journal Information:
ACS Energy Letters, Journal Name: ACS Energy Letters Journal Issue: 6 Vol. 9; ISSN 2380-8195
Publisher:
American Chemical Society (ACS)Copyright Statement
Country of Publication:
United States
Language:
English

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