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Title: Robust Solid/Electrolyte Interphase (SEI) Formation on Si Anodes Using Glyme-Based Electrolytes

Journal Article · · ACS Energy Letters
ORCiD logo [1];  [2];  [3];  [1]; ORCiD logo [1]; ORCiD logo [2]; ORCiD logo [4]; ORCiD logo [2];  [2]; ORCiD logo [2];  [5]; ORCiD logo [1]; ORCiD logo [1]
  1. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
  2. National Renewable Energy Lab. (NREL), Golden, CO (United States)
  3. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States) ; Univ. of Tennessee, Knoxville, TN (United States)
  4. Pacific Northwest National Lab. (PNNL), Richland, WA (United States)
  5. Argonne National Lab. (ANL), Argonne, IL (United States)

Silicon (Si) is the most naturally abundant element possessing 10-fold greater theoretical capacity compared to that of graphite-based anodes. The practicality of implementing Si anodes is, however, limited by the unstable solid/electrolyte interphase (SEI) and anode fracturing during continuous lithiation/delithiation. We demonstrate that glyme-based electrolytes (GlyEls) ensure a conformal SEI on Si and keep the Si “fracture-free”. Benchmarking against the optimal, commonly used carbonate electrolyte with the fluoroethylene carbonate additive, the Si anode cycled in a GlyEl exhibits a reduced early parasitic current (by 62.5%) and interfacial resistance (by 72.8%), while cell capacity retention is promoted by >7% over the course of 110 cycles. A mechanistic investigation by X-ray photoelectron spectroscopy and energy-dispersive X-ray spectroscopy indicates GlyEl enriches Si SEI with elastic polyether but diminishes its carbonate species. Glyme-based electrolytes proved to be viable in stabilizing the SEI on Si for future high energy density lithium-ion batteries.

Research Organization:
National Renewable Energy Lab. (NREL), Golden, CO (United States); Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Sponsoring Organization:
USDOE Office of Energy Efficiency and Renewable Energy (EERE), Vehicle Technologies Office; USDOE Office of Energy Efficiency and Renewable Energy (EERE)
Grant/Contract Number:
AC36-08GO28308; AC05-00OR22725
OSTI ID:
1785091
Alternate ID(s):
OSTI ID: 1797645
Report Number(s):
NREL/JA-5K00-80105; MainId:42308; UUID:cb172aaa-621c-4240-9ef3-6db81d1e2d84; MainAdminID:24514
Journal Information:
ACS Energy Letters, Vol. 6, Issue 5; ISSN 2380-8195
Publisher:
American Chemical Society (ACS)Copyright Statement
Country of Publication:
United States
Language:
English

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