These assignments can be further justified based on the fact that, for example, the peak at ∼450 cm -1 is found to become unnoticeable at 100% depth of discharge (blue curve), while the ones at ∼500 cm -1 , ∼560 cm -1 , and ∼650 cm -1 are found at all stages of discharge. A clear broad activity is observed in Fig. in 450-500 cm -1 range. Our calculations show that this broad activity arises mostly from the emerging lithium-sulfur structure and is found to occur in a comparable frequency range, namely 470-550 cm -1 .