Abstract
Organic monolayers of epoxy-containing oligo(ethylene oxide)s were grafted to the surface of silicon nanoparticles via a hydrosilylation reaction. The surface functional groups suppressed the chemical and electrochemical reactivity of the as-grown and lithiated silicon nanoparticles with high material utilization. A robust Si/electrolyte interphase was formed with the participation of the grafted organic groups with facilitated Li+ transfer and was further enforced by electrode integrity via the epoxy/poly(acrylic acid) (PAA) binder reaction. The improved cycling stability and post-test analysis indicate that surface functionalization on the Si particle level is a feasible approach to enabling a Si anode in high-energy-density lithium-ion batteries.
Original language | English |
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Pages (from-to) | 6176-6183 |
Number of pages | 8 |
Journal | ACS Applied Energy Materials |
Volume | 2 |
Issue number | 9 |
DOIs | |
State | Published - Sep 23 2019 |
Externally published | Yes |
Funding
This research is supported by the U.S. Department of Energy (DOE), Office of Energy Efficiency and Renewable Energy, Vehicle Technologies Office. Argonne National Laboratory is operated for the DOE Office of Science by UChicago Argonne, LLC, under Contract No. DE-AC02-06CH11357. This work was authored in part by Alliance for Sustainable Energy, LLC, the manager and operator of the National Renewable Energy Laboratory for the U.S. Department of Energy (DOE) under Contract No. DE-AC36-08GO28308. Use of the Center for Nanoscale Materials was supported by the DOE Office of Science, Office of Basic Energy Sciences, under Contract No. DE-AC02-06CH11357.
Keywords
- Coulombic efficiency
- SEI formation
- Si nanoparticles
- chemical/electrochemical stability
- cycling stability
- epoxy-containing oligo(ethylene oxide)s
- surface functionalization