All-inorganic halide perovskite CsPbBr3@CNTs composite enabling superior lithium storage performance with pseudocapacitive contribution

All-inorganic halide perovskites have recently made remarkable achievements in the field of photo-electrochemistry, but rarely been applied in energy storage devices, especially, in lithium-ion batteries (LIBs). In this article, the specific composite composed of carbon nanotubes (CNTs) tightly wrapped perovskite-CsPbBr 3 (CsPbBr 3 @CNTs) was synthesized by a simplified co-precipitation method. Attributed to the specific morphology, the CsPbBr 3 @CNTs composite supplied short pathways for the transport of both electrons and lithium ions, along with the interface for pseudocapacitive behavior. The synergistic effects of CsPbBr 3 and CNTs enhanced the pseudocapacitive effect, thus, CsPbBr 3 @CNTs exhibited high cycling stability and rate capability. The prominent lithium storage capabilities were exhibited then, with first reversible capacity of 644.6 mA h g −1 /100 mA g −1 and maintained at 470.2 mA h g −1 after 200 cycles. Moreover, under the large current density of 600 mA g −1 , it kept a stable capacity of 203.8 mA h g −1 . This study, for the very first time, proved the great application potential of all-inorganic perovskite composite materials with surface dominating pseudocapacitive contribution in LIBs.