Morphological and chemical tuning of lead halide perovskite mesocrystals as long-life anode materials in lithium-ion batteries

摘要

Five methylammonium lead bromide (MAPbBr(3)) microcrystals with different sizes (similar to 2.9 mm, similar to 2.4 mm, similar to 1.9 mm, similar to 1.5 mm and similar to 1.2 mm), were successfully designed using a facile solvothermal method through tuning the concentration of Pb precursors. The morphology, micro/nanostructure, and chemical composition of these MAPbBr(3) crystals are characterized in detail by SEM, XPS, FTIR, PL, TG/DSC, and Hall measurements. The influences of the microstructures involving the defect and grain boundaries on the performance evolution for Li-ion batteries were studied. 3 samples with big, medium, and small sizes (2.9, 1.9 and 1.2 mm) were selected to investigate their electrochemical performance. Interestingly, the MAPbBr(3) anodes showed size-dependent electrochemical performance. More importantly, this is the first report stating that excellent cycling stability for 1000 cycles of MAPbBr(3) anodes composed of small sized samples should be attributed to the small size, low defect concentration structure and good interface charge transfer.