The vibrational mode around 1000 cm -1 is a strong indicator of a benzene ring breathing vibration in all systems. Here, we observe that the intensity of this mode fluctuates nonmonotonically with the depth of discharge. As will be discussed later, the intensity of this band could be heavily affected by the presence of binder material and/or carbon black. Furthermore, we observe that the formation of lithium-sulfur structures could have a far-reaching effect. For example, as shown in Fig.