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Publicação
Deposition of silicon on substrates of interest for lithium-ion battery anodes
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Orientador(es)
Resumo(s)
The development of lithium-ion batteries in recent years has focused on the anode, with progresses made
in order to increase its capacity by using environmentally friendly and available materials such as silicon.
This work aims at setting up a previously developed chemical vapour deposition system while using it
for the deposition of silicon on carbon-based substrates for lithium-ion battery anodes.
After deposition, the samples are analysed through different techniques: cyclic voltammetry to evaluate
the lithiation and delithiation, scanning electron microscopy and energy dispersive spectroscopy to
observe the morphology and chemical composition while X-ray diffraction was used to obtain insights
on the crystallinity of the deposited materials.
The results confirm that we were successful in depositing silicon on different substrates with silicon
mass loading up to 3% of the total sample weight, having a shell type structure on carbon coated metal
substrates and clusters of particles in rigid graphite substrates. Cyclic voltammetry exhibits lithiation
and delithiation behaviours achieving coulombic efficiencies in the range of 60 to 70% after 3 cycles.
Descrição
Tese de mestrado integrado, Engenharia da Energia e do Ambiente , 2022, Universidade de Lisboa, Faculdade de Ciências
Palavras-chave
baterias de ião lítio deposição química em fase de vapor silício grafite Teses de mestrado - 2023