Ruddlesden Popper 2D perovskites as Li-ion battery electrodes

Angus Mathieson,Shahab Ahmad,Jung Tae Lee,Youcheng Zhang,Michael De Volder,Mohammad Rahil,Wesley M Dose,Felix Deschler

doi:10.1039/d1ma00020a

Abstract

The electrochemical performance of 2-dimensional hybrid perovskite electrodes for Li-ion batteries are investigated using a high-molarity electrolyte. The effect of changing the halide content and layering structure is systematically explored.

Highlights

*d and Hybrid metal halide perovskites, typically known for their photovoltaic applications, have recently gained traction as a potential energy-storage material due to their promising gravimetric capacities as lithium-ion battery electrode materials
The hybrid perovskite materials are characterised using a combination of UV-vis absorption and X-ray diffraction (XRD) spectroscopy to confirm the characteristic shifts in the bandgap and crystallographic spacing associated with the layering order of the Ruddlesden Popper (RP) perovskite series
We demonstrate that out of the iodide and bromide based RP layered perovskite structures, an optimum composition for Li-ion batteries (LIBs) performance is reached with the n = 4 bromide species (BA)2(MA)3Pb4Br13

Summary

Introduction

*d and Hybrid metal halide perovskites, typically known for their photovoltaic applications, have recently gained traction as a potential energy-storage material due to their promising gravimetric capacities as lithium-ion battery electrode materials. Higher gravimetric discharge capacities have subsequently been reported by Tathavadekar et al.[15] for the one-dimensional (1D) benzidine lead iodide with needlelike morphology of 646 mA h gÀ1, 508 mA h gÀ1 for the twodimensional (2D) layered butylammonium (BA) lead iodide (BAPbI4), and 202 mA h gÀ1 for the traditional MAPbI3 bulk phase after 50 cycles. While these capacities are promising, compared to commercial graphite anodes (theoretical capacity of 372 mA h gÀ1 ),[16] relatively little attention and resource have been dedicated to the further development of this application due to the unstable behaviour of hybrid perovskites. Paper in the Li-ion battery environment.[17,18,19] the composition-function and structure–function relationships for hybrid perovskite electrodes remain poorly understood

Methods

Results

Conclusion