Morphological and chemical tuning of lead halide perovskite mesocrystals as long-life anode materials in lithium-ion batteries
Morphological and chemical tuning of lead halide perovskite mesocrystals as long-life anode materials in lithium-ion batteries
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卤化铅钙钛矿介晶作为锂离子电池长寿命负极材料的形态和化学调节
DOI：
10.1039/c8ce01779d
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发表时间：
2019-02-14
期刊：
影响因子：
3.1
通讯作者：
Qin, Wei
中科院分区：
文献类型：
--
作者：
Wang, Qun;Yang, Tao;Qin, Wei
通过调整铅前驱体的浓度，采用简单溶剂热法成功设计了5种不同尺寸（2.9 mm、2.4 mm、1.9 mm、1.5 mm和1.2 mm）的甲基溴化铅（MAPbBr(3)）微晶体。通过SEM、XPS、FTIR、PL、TG/DSC和Hall测量对MAPbBr(3)晶体的形貌、微纳米结构和化学组成进行了详细的表征。研究了含缺陷和晶界的微观组织对锂离子电池性能演变的影响。选取大、中、小3种尺寸（2.9、1.9、1.2 mm）的样品，考察其电化学性能。有趣的是，MAPbBr(3)阳极表现出与尺寸相关的电化学性能。更重要的是，这是首次报道小尺寸样品组成的MAPbBr(3)阳极具有1000次循环的优异循环稳定性，这应该归功于小尺寸、低缺陷浓度结构和良好的界面电荷转移。
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.