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Microscopic Observation of Solid Electrolyte Interphase Bilayer Inversion on Silicon Oxide

Journal Article · · ACS Energy Letters
 [1];  [2];  [2];  [2];  [2];  [2];  [3];  [2];  [2]
  1. National Renewable Energy Lab. (NREL), Golden, CO (United States); Colorado School of Mines, Golden, CO (United States)
  2. National Renewable Energy Lab. (NREL), Golden, CO (United States)
  3. Colorado School of Mines, Golden, CO (United States)
+ Show Author Affiliations
Silicon has been investigated in recent years as an alloying anode material to enhance gravimetric energy density in lithium-ion batteries. Although recent developments have suggested that silicon oxides exhibit improved cycling stability over pure Si, the origin of the improved cycling performance is still poorly understood. The initial solid electrolyte interphase (SEI) formation mechanisms on Si wafers with both native oxide and chemically etched thermal oxide coatings are investigated structurally, chemically, and morphologically in the nanoscale. After one electrochemical cycle, microscopy reveals that SEI formed on native SiOx features the typical SEI bilayer structure with a carbon-rich outer SEI layer and an inorganic-rich inner SEI layer. In contrast, the SEI formed on chemically etched thermal oxide shows an inversion in the structure. This work observes distinct initial SEI formation mechanisms on the HF-etched SiO2 surface, which may be partially responsible for improved cycle life observed in SiOx-based anode materials.
Research Organization:
National Renewable Energy Laboratory (NREL), Golden, CO (United States)
Sponsoring Organization:
USDOE Office of Energy Efficiency and Renewable Energy (EERE), Transportation Office. Vehicle Technologies Office
Grant/Contract Number:
AC36-08GO28308
OSTI ID:
1721751
Report Number(s):
NREL/JA--5K00-77261; MainId:26207; UUID:1cfcfec0-4728-40e7-9bc2-bdcb4672f139; MainAdminID:18843
Journal Information:
ACS Energy Letters, Journal Name: ACS Energy Letters Journal Issue: 12 Vol. 5; ISSN 2380-8195
Publisher:
American Chemical Society (ACS)Copyright Statement
Country of Publication:
United States
Language:
English

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25 ENERGY STORAGE
lithium-ion battery
scanning transmission electron microscopy
silicon anode
solid electrolyte interphase