Micromechanical Testing of Pristine and Delithiated Single Carbon Fibres for Structural Battery Composite
Typ
Examensarbete för masterexamen
Program
Materials engineering (MPAEM), MSc
Publicerad
2021
Författare
Ravindranath, Sreehari Batni
Modellbyggare
Tidskriftstitel
ISSN
Volymtitel
Utgivare
Sammanfattning
Reduction of mass of the battery system in electric vehicles (EV) is one of the major
requirements of the use of EV in place of internal combustion (IC) engines. A novel
solution to reduce the mass of the system is by replacing the present battery material
with multifunctional material. These are the materials that can simultaneously
carry the load and act as an electrode for the battery system.
In this study, carbon fibre is used as a candidate multifunctional material. This
project aims to examine the tensile strength, modulus, and Weibull distribution of
pristine and delithiated single carbon fibre. The tensile properties of 25 mm and 15
mm gauge length fibres were examined using a microtester. The fractured surface
was investigated with SEM and EDX.
The delithiation doesn’t affect the tensile modulus of the fibre. A considerable
amount of difference was detected in the Weibull modulus. The Weibull value ’m’
is high for pristine fibre and a bit less for delithiated fibres. The SEM and EDX
results showed that there is a slight change in the surface morphology of fibre and
an increase in the content of oxygen in delithiated fibres. This can be due to the
remnants of lithium from lithiation and delithiation which were oxidized once they
were exposed to the atmosphere.
Beskrivning
Ämne/nyckelord
Structural battery composite , lithiation/delithiation , fractography , Weibull modulus , microtester