Si Oxidation and H2 Gassing During Aqueous Slurry Preparation for Li-Ion Battery Anodes

Hays, Kevin A.; Key, Baris; Li, Jianlin; Wood, David L.; Veith, Gabriel M.

doi:10.1021/acs.jpcc.8b01062

Title: Si Oxidation and H₂ Gassing During Aqueous Slurry Preparation for Li-Ion Battery Anodes

Journal Article · 24 April 2018 · Journal of Physical Chemistry. C

DOI: https://doi.org/10.1021/acs.jpcc.8b01062 · OSTI ID:1436953

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Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Energy and Transportation Science Division
Argonne National Lab. (ANL), Argonne, IL (United States). Chemical Sciences and Engineering Division
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Materials Science & Technology Division

Si has the possibility to greatly increase the energy density of Li-ion battery anodes, though it is not without its problems. One issue often overlooked is the decomposition of Si during large scale slurry formulation and battery fabrication. Here, we investigate the mechanism of H₂ production to understand the role of different slurry components and their impact on the Si oxidation and surface chemistry. Mass spectrometry and in situ pressure monitoring identifies that carbon black plays a major role in promoting the oxidation of Si and generation of H₂. Si oxidation also occurs through atmospheric O₂ consumption. Both pathways, along with solvent choice, impact the surface silanol chemistry, as analyzed by ¹H–²⁹Si cross-polarization magic angle spinning nuclear magnetic resonance (MAS NMR) and attenuated total reflectance Fourier transform infrared spectroscopy (ATR FTIR). An understanding of the oxidation of Si, during slurry processing, provides a pathway toward improving the manufacturing of Si based anodes by maximizing its capacity and minimizing safety hazards.

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Research Organization:: Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)

Sponsoring Organization:: USDOE Office of Energy Efficiency and Renewable Energy (EERE), Vehicle Technologies Office (EE-3V)

Grant/Contract Number:: AC05-00OR22725

OSTI ID:: 1436953

Journal Information:: Journal of Physical Chemistry. C, Vol. 122, Issue 18; ISSN 1932-7447

Publisher:: American Chemical SocietyCopyright Statement

Country of Publication:: United States

Language:: English

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