Anion engineering in lithium cobalt oxide for application in high-performance supercapacitors

Figure 2 illustrates the FTIR spectra of LiCoO₂ and LiCoO_1.6(F_0.8Cl_0.2)_0.4. In the spectrum of LiCoO₂, the peaks at 555 and 600 cm⁻¹ are attributed to the symmetric and asymmetric vibrations of O–Co–O in the octahedral sites³⁵. The…