Mechanical measurements on lithium phosphorous oxynitride coated silicon thin film electrodes for lithium-ion batteries during lithiation and delithiation

Journal Article · Mon Aug 15 04:00:00 EDT 2016 · Applied Physics Letters

DOI:https://doi.org/10.1063/1.4961234· OSTI ID:22590544

Al-Obeidi, Ahmed; Kramer, Dominik; Mönig, Reiner ^[1]

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1. Institute for Applied Materials, Karlsruhe Institute of Technology, Hermann-von-Helmholtz-Platz 1, 76344 Eggenstein-Leopoldshafen (Germany)

The development of large stresses during lithiation and delithiation drives mechanical and chemical degradation processes (cracking and electrolyte decomposition) in thin film silicon anodes that complicate the study of normal electrochemical and mechanical processes. To reduce these effects, lithium phosphorous oxynitride (LiPON) coatings were applied to silicon thin film electrodes. Applying a LiPON coating has two purposes. First, the coating acts as a stable artificial solid electrolyte interphase. Second, it limits mechanical degradation by retaining the electrode's planar morphology during cycling. The development of stress in LiPON-coated electrodes was monitored using substrate curvature measurements. LiPON-coated electrodes displayed highly reproducible cycle-to-cycle behavior, unlike uncoated electrodes which had poorer coulombic efficiency and exhibited a continual loss in stress magnitude with continued cycling due to film fracture. The improved mechanical stability of the coated silicon electrodes allowed for a better investigation of rate effects and variations of mechanical properties during electrochemical cycling.

• OSTI ID: 22590544
• Journal Information: Applied Physics Letters, Journal Name: Applied Physics Letters Journal Issue: 7 Vol. 109; ISSN APPLAB; ISSN 0003-6951
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
ANODES
COATINGS
EFFICIENCY
ELECTROCHEMISTRY
FRACTURES
LITHIUM
LITHIUM ION BATTERIES
LITHIUM IONS
MECHANICAL PROPERTIES
MORPHOLOGY
NITRIDES
OXYGEN COMPOUNDS
SILICON
SOLID ELECTROLYTES
STABILITY
STRESSES
SUBSTRATES
THIN FILMS