Electrochemical Performance of 3D Network CsPbBr₃ Perovskite Anodes for Li-Ion Batteries: Experimental Venture with Theoretical Expedition

Whenever the phrase metal halide perovskites is referred, we generally think of the optoelectronic applicability. Going beyond this, here, we report the usage perspective of CsPbBr 3 as an active anode material in Li-ion batteries. To investigate its electrochemical behavior as an anode, half and full Li-ion batteries are fabricated by using a gel polymer electrolyte. The fabricated half-cell exhibits specific discharge capacities of ∼376, 261, 202, and 142 mA h g –1 at current densities of 30, 60, 150, and 200 mA g –1, respectively. The cell retains 79% of its initial specific discharge capacity after 100 cycles at a current density of 60 mA g –1 . Any severe alteration or re-arrangement of the crystal structure in the Li + intake/release process during the electrochemical cycling also suggests the notable stability of the fabricated CsPbBr 3 perovskite. Experimental results are further corroborated via density functional theory. This work may endow a new avenue for the realization of other perovskite-based Li-ion batteries and motivates the researchers for possible integration of Li-ion batteries and solar cells and thereby envisages their potential as photobatteries.