title: Methylammonium Lead Bromide Perovskite Battery Anodes Reversibly Host High Li-Ion Concentrations.
abstract: Ions migrate through the hybrid halide perovskite lattice, allowing for a variety of electrochemical applications as perovskite-based electrodes for batteries. It is still unknown how extrinsic defects such as lithium ions interact with the hybrid perovskite structure during the charging process. It is shown here that Li+intake/release proceeds by topotactic insertion into the hybrid perovskite host, without drastic structural alterations or rearrangement. Even the perovskite electronic band structure remains basically unaltered upon cycling. The occurrence of conversion or alloying reactions producing metallic lead is discarded. Stable specific capacity ∼200 mA h g-1is delivered, which entails outstanding Li-ion molar concentration, x in LixCH3NH3PbBr3, approaching 3. Slight distortions of the perovskite lattice upon cycling explain the highly reversible Li+intercalation reaction that also exhibits an excellent rate capability.
authors.affiliation: Institute of Advanced Materials (INAM), Universitat Jaume I , 12006 Castelló, Spain.
authors.forename: Nuria
authors.initials: N
authors.lastname: Vicente
authors.affiliation: Institute of Advanced Materials (INAM), Universitat Jaume I , 12006 Castelló, Spain.
authors.forename: Germà
authors.identifier: http://orcid.org/0000-0002-0172-6175
authors.initials: G
authors.lastname: Garcia-Belmonte