Lithium triflate salt has been shown to be a promising dopant
salt in its ability to effectively reduce the degree of crystallinity
in P(VdF-HFP)-based solid polymer electrolytes. XRD, HATR-FTIR
and DSC data of selected low, intermediate and high concentrations
of LiTf salt incorporated in P(VdF-HFP) substantiate each
other and are supported by ionic conductivity study and photoluminescence
studies (PL). Disappearance and shifting of bands, formation
of new peaks and changes in intensity in the HATR-FTIR
spectra suggest complexation has occurred between P(VdF-HFP)
and LiTf. This signifies that LiTf is well dissociated to complex with
P(VdF-HFP), which leads to the effective disruption of crystalline
domain and gives rise to new P(VdF-HFP)/LiTf amorphous phase.
Other additives such as plasticisers, fillers or ionic liquids may be
considered as other means of reducing the crystallinity of polymer
in future work.