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首页> 外文期刊>International journal of green energy >Novel mesoporous microspheres of Al and Ni doped LMO spinels and their performance as cathodes in secondary lithium ion batteries
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Novel mesoporous microspheres of Al and Ni doped LMO spinels and their performance as cathodes in secondary lithium ion batteries

机译：铝和镍掺杂的LMO尖晶石的新型介孔微球及其在二次锂离子电池中作为阴极的性能

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摘要

A facile, scalable, and solution-based technique is used to fabricate Al and Ni-doped (LiAl0.1Mn1.9O4 and LiAl0.1Ni0.1Mn1.8O4) microspheres of lithium manganese oxide (LMO) spinels for use as reversible cathode materials for lithium ion batteries (LIBs). The spheres of the two samples exhibit different porosities. Cells with these LMO-based cathodes are then cycled between 4.5V and 2V to study their stabilities while simultaneously being subjected to the undesirable Jahn-Teller distortion that occurs around the similar to 3V regime. The LiAl0.1Mn1.9O4 (LAMO) and the LiAl0.1Ni0.1Mn1.8O4 (LANMO) cells exhibit comparable open circuit voltages (OCV) of 2.94V and 2.97V, respectively. During cell cycling, the LAMO cell exhibits a maximum specific capacity of 122.51mAh g(-1) with a capacity fade of 65.35% after 75 cycles. The LiAl0.1Ni0.1Mn1.8O4 (LAMO) sample fares better and exhibits a maximum of 140.49mAh g(-1) and a capacity drop of 52.59%. Detailed structural studies indicate that Ni doping and the greater degree of porosity of the LANMO sample to be a stabilizing factor. This is further confirmed by cyclic voltammetry (CV) and AC impedance spectra analysis.
机译：一种简便，可扩展且基于解决方案的技术可用于制造锰酸锂锰（LMO）尖晶石的Al和Ni掺杂的（LiAl0.1Mn1.9O4和LiAl0.1Ni0.1Mn1.8O4）微球，用作可逆的阴极材料。锂离子电池（LIB）。两个样品的球体显示出不同的孔隙率。然后，将具有这些基于LMO的阴极的电池在4.5V至2V之间循环以研究其稳定性，同时使电池遭受类似于3V方案周围发生的不希望的Jahn-Teller畸变。 LiAl0.1Mn1.9O4（LAMO）和LiAl0.1Ni0.1Mn1.8O4（LANMO）电池分别具有可比较的2.94V和2.97V的开路电压（OCV）。在电池循环过程中，LAMO电池在75个循环后的最大比容量为122.51mAh g（-1），容量衰减为65.35％。 LiAl0.1Ni0.1Mn1.8O4（LAMO）样品的性能更好，并且最大表现为140.49mAh g（-1），容量下降了52.59％。详细的结构研究表明，Ni掺杂和LANMO样品的较大孔隙度是稳定因素。循环伏安法（CV）和交流阻抗谱分析进一步证实了这一点。

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