A Multifunctional Silly-Putty Nanocomposite Spontaneously Repairs Cathode Composite for Advanced Li-S Batteries

Although lithium sulfur batteries have been regarded as one of the most promising candidates for high efficient energy storage devices, however, their practical application are still hindered by the notorious "shuttle effect" and instability of cathode structure during cycling. In this work, conductive reduced graphene oxides nanosheets added-putty (rGO-putty) adaptive functional interlayer is designed to effectively suppress the diffusion of polysulfides while simultaneously promoted the dynamic protection of the whole cathode structure during cycling. Consequently, largely suppressed polysulfides diffusion combined with the greatly enhanced cathode stability is achieved while the all-around conductive protecting layer is formed benefited from the viscoelasticity property of rGO-putty. As a result, a capacity of 586 mAh g(-1) is demonstrated after long-cycling term of 1000 cycles and high cycling stability of only 0.03% capacity decay per cycle is exhibited. The largely enhanced electrochemical performance suggests the important role of the rGO-putty in suppressing the "shuttle effect" and maintaining the integrity of the cathode material.