Modulating luminescence through anion variation in lead-free CsNaInX (X = Cl, Br, and I) perovskites: a first-principles study.

The ABB'X-type lead-free halide perovskite CsNaInCl has demonstrated limited luminescence performance attributed to parity-forbidden transitions in its intrinsic form. While extensive exploration has been dedicated to partial cation substitution in CsNaInCl, there is a noticeable gap in understanding the impact of anion composition on this material. In this study, we investigated the influence of anion composition on the luminescence performance of CsNaInX using first-principles calculations.

Boosting the Cycle Performance of Iron Trifluoride Based Solid State Batteries at Elevated Temperatures by Engineering the Cathode Solid Electrolyte Interface.

Iron trifluoride (FeF) is attracting tremendous interest due to its lower cost and the possibility to enable higher energy density in lithium-ion batteries. However, its cycle performance deteriorates rapidly in less than 50 cycles at elevated temperatures due to cracking of the unstable cathode solid electrolyte interface (CEI) followed by active materials dissolution in liquid electrolyte. Herein, by engineering the salt composition, the FeO-type CEI with the doping of boron (B) atoms in a polymer electrolyte at 60 °C is successfully stabilized.