CNT film supported MXene/Co3O4 composite interlayers for high performance Li-S batteries

Adding a functionalized interlayer is one of the effective means to solve the problem of capacity attenuation caused by the shuttle of polysulfides in lithium-sulfur (Li-S) batteries. Moreover, the interlayer has the potential to take on more roles, such as having good mechanical flexibility to ensure high safety and flame-retardant property to improve the high temperature performance of the battery. Thus, in this work, an MXene/Co3O4-CNT film interlayer that is capable of dual chemisorption to polysulfides with good mechanical strength and flame retardancy has been investigated. The resultant Li-S battery assembled with this interlayer exhibits a high discharge capacity of 1569.5 mA h g(-1), an excellent charge-discharge stability over 600 cycles, and a high temperature stability of the electrochemical performance. Published under an exclusive license by AIP Publishing.

Automated summary

Adding a functionalized interlayer is an effective means to solve the capacity attenuation problem in Li-S batteries caused by the shuttle of polysulfides. This study investigates an MXene/Co3O4-CNT film interlayer with dual chemisorption capability to polysulfides, providing good mechanical strength and flame retardancy. The resulting Li-S battery assembled with this interlayer demonstrates high discharge capacity, excellent charge-discharge stability over cycles, and high temperature stability of electrochemical performance.