SEI-component formation on sub 5 nm sized silicon nanoparticles in Li-ion batteries: the role of electrode preparation, FEC addition and binders

Physical Chemistry Chemical Physics : PCCP
Tony JaumannLars Giebeler

Abstract

Silicon is a promising negative electrode for secondary lithium-based batteries, but the electrochemical reversibility of particularly nanostructured silicon electrodes drastically depends on their interfacial characteristics, commonly known as the solid electrolyte interface (SEI). The beneficial origin of certain electrolyte additives or different binders is still discussed controversially owing to the challenging peculiarities of interfacial post-mortem investigations of electrodes. In this work, we address the common difficulties of SEI investigations of porous silicon/carbon nanostructures and study the addition of a fluoroethylene carbonate (FEC) as a stabilizing additive as well as the use of two different binders, carboxymethyl cellulose/styrene-butadiene rubber (CMC/SBR) and polyacrylic acid (PAA), for the SEI formation. The electrode is composed of silicon nanocrystallites below 5 nm diameter allowing a detailed investigation of interfacial characteristics of silicon owing to the high surface area. We first performed galvanostatic long-term cycling (400 times) and carried out comprehensive ex situ characterization of the cycled nanocrystalline silicon electrodes with XRD, EDXS, TEM and XPS. We modified the preparation...Continue Reading

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Citations

Jan 9, 2018·Chemical Society Reviews·Alok M TripathiBing Joe Hwang
Aug 28, 2019·ChemSusChem·Rongnan GuoWeiqiang Han
Oct 17, 2019·Scientific Reports·Hanne Flåten AndersenJan Petter Mæhlen
Jul 6, 2019·ACS Applied Materials & Interfaces·Chul-Ho JungSeong-Hyeon Hong
Nov 13, 2019·ACS Applied Materials & Interfaces·Krysten MinniciElsa Reichmanis

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