It needs to be noted that additional additives, including electrical conductive agents and binders, are usually required in fabricating the sulfur cathode for Li–S batteries. As a result, the proportion of sulfur in the final electrode is relatively low, which enormously reduces the energy density of the Li–S batteries. Consequently, it is important to increase the sulfur content in the electrode while still retaining its high utilization. Binder-free and film-like S–CNT electrodes prepared by chemical vapor deposition (CVD) were thus proposed recently.(28, 29) Nevertheless, the CVD method is not cost-effective and requires harsh experimental conditions. Most recently, a self-weaving paper-like S-CNT composite cathode was reported by Su et al. through a relatively simple solution-based process.(30) An average energy density of 852 W h kg–1 based on the total mass of the cathode could be achieved. Unfortunately, a large amount of CNTs were utilized to guarantee the good electrochemical performance of the composite, which resulted in a relatively low sulfur content of 40 wt %. The energy density is expected to be further increased if the content of CNTs can be reduced. It should be pointed out that the interaction between sulfur and the conducting agents also plays an important role in the electrochemical performance of the sulfur cathode. In a recent paper reporting a sulfur/graphene composite cathode material, the formation of covalent bonds between oxygenic groups in graphene oxide and sulfur by thermal treatment was presented and considered to be essential to raise the charge/discharge stability of the composite.(31) It is noted that in Su’s work the deposition of sulfur was conducted at room temperature, and pristine CNTs with no functional groups were employed. Such reaction conditions are not favorable for generating strong interactions between two components. If the formation of covalent bonds between sulfur and CNTs can be realized, the dissolution of sulfur is expected be further suppressed, which is beneficial for improving the cycling stability of the sulfur cathode.