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Title: Effects of cathode electrolyte interfacial (CEI) layer on long term cycling of all-solid-state thin-film batteries

All-solid-state lithium-ion batteries have the potential to not only push the current limits of energy density by utilizing Li metal, but also improve safety by avoiding flammable organic electrolyte. However, understanding the role of solid electrolyte – electrode interfaces will be critical to improve performance. In this paper, we conducted long term cycling on commercially available lithium cobalt oxide (LCO)/lithium phosphorus oxynitride (LiPON)/lithium (Li) cells at elevated temperature to investigate the interfacial phenomena that lead to capacity decay. STEM-EELS analysis of samples revealed a previously unreported disordered layer between the LCO cathode and LiPON electrolyte. This electrochemically inactive layer grew in thickness leading to loss of capacity and increase of interfacial resistance when cycled at 80 °C. Finally, the stabilization of this layer through interfacial engineering is crucial to improve the long term performance of thin-film batteries especially under thermal stress.
Authors:
 [1] ;  [1] ;  [2] ;  [2] ;  [3] ;  [3] ;  [3] ;  [3] ;  [1]
  1. Univ. of California, San Diego, CA (United States). Dept. of NanoEngineering
  2. Brookhaven National Lab. (BNL), Upton, NY (United States). Center for Functional Nanomaterials
  3. STMicroelectronics, Tours (France)
Publication Date:
OSTI Identifier:
1341677
Report Number(s):
BNL-113405-2017-JA
Journal ID: ISSN 0378-7753; R&D Project: 16060; 16060; KC0403020
Grant/Contract Number:
SC0012704; SC0002357
Type:
Accepted Manuscript
Journal Name:
Journal of Power Sources
Additional Journal Information:
Journal Volume: 324; Journal ID: ISSN 0378-7753
Publisher:
Elsevier
Research Org:
Brookhaven National Lab. (BNL), Upton, NY (United States); Univ. of California, San Diego, CA (United States); STMicroelectronics, Tours (France)
Sponsoring Org:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22); STMicroelectronics (France)
Country of Publication:
United States
Language:
English
Subject:
25 ENERGY STORAGE; Lithium-ion battery; Thin-film battery; Interfacial phenomena; Interface resistance; Solid electrolyte