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Title: Systematic Investigation of the Alucone-Coating Enhancement on Silicon Anodes

Polyvinylidene fluoride (PVDF) is the most popular binder in commercial lithium-ion batteries but is incompatible with a silicon (Si) anode because it fails to maintain the mechanical integrity of the Si electrode upon cycling. Here in this paper, an alucone coating synthesized by molecular layer deposition has been applied on the laminated electrode fabricated with PVDF to systematically study the sole impact of the surface modification on the electrochemical and mechanical properties of the Si electrode, without the interference of other functional polymer binders. The enhanced mechanical properties of the coated electrodes, confirmed by mechanical characterization, can help accommodate the repeated volume fluctuations, preserve the electrode structure during electrochemical reactions, and thereby, leading to a remarkable improvement of the electrochemical performance. Owing to the alucone coating, the Si electrodes achieve highly reversible cycling performance with a specific capacity of 1490 mA h g -1 (0.90 mA h cm -2) as compared to 550 mA h g -1 (0.19 mA h cm -2) observed in the uncoated Si electrode. This research elucidates the important role of surface modification in stabilizing the cycling performance and enabling a high level of material utilization at high mass loading. It also provides insights for themore » future development of Si anodes.« less
Authors:
 [1] ;  [2] ;  [2] ; ORCiD logo [3] ;  [4] ;  [5] ; ORCiD logo [6] ;  [2] ; ORCiD logo [1]
  1. National Renewable Energy Lab. (NREL), Golden, CO (United States)
  2. Univ. of Kentucky, Lexington, KY (United States). Dept. of Chemical and Materials Engineering
  3. National Renewable Energy Lab. (NREL), Golden, CO (United States); Colorado School of Mines, Golden, CO (United States). Dept. of Chemistry
  4. ALD NanoSolution, Broomfield, CO (United States)
  5. Colorado School of Mines, Golden, CO (United States). Dept. of Materials Science
  6. Colorado School of Mines, Golden, CO (United States). Dept. of Chemistry
Publication Date:
Report Number(s):
NREL/JA-5900-68672
Journal ID: ISSN 1944-8244
Grant/Contract Number:
AC36-08GO28308
Type:
Accepted Manuscript
Journal Name:
ACS Applied Materials and Interfaces
Additional Journal Information:
Journal Volume: 9; Journal Issue: 46; Journal ID: ISSN 1944-8244
Publisher:
American Chemical Society (ACS)
Research Org:
National Renewable Energy Lab. (NREL), Golden, CO (United States)
Sponsoring Org:
USDOE Office of Energy Efficiency and Renewable Energy (EERE), Vehicle Technologies Office (EE-3V)
Country of Publication:
United States
Language:
English
Subject:
25 ENERGY STORAGE; energy storage; lithium-ion batteries; molecular layer deposition; polyvinylidene fluoride binder; silicon-based anodes
OSTI Identifier:
1409165