Synthesis and electrochemical properties of high performance polyhedron sphere like lithium manganese oxide for lithium ion batteries
Synthesis and electrochemical properties of high performance polyhedron sphere like lithium manganese oxide for lithium ion batteries
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锂离子电池用高性能多面体球状锰酸锂的合成及电化学性能
DOI：
10.1016/j.jallcom.2015.01.182
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发表时间：
2015-05
影响因子：
6.2
通讯作者：
Haijiang Wang
中科院分区：
文献类型：
--
作者：
Enbo Shangguan;Kun Chang;Xiao-Zi Yuan;Haijiang Wang
以β-MnO2纳米棒为前驱体，在800℃下通过固相反应成功地合成了多面体结构的球形锰酸锂(LiMn2O4)材料。与之相比，β-MnO2纳米棒前驱体也分别在700℃和900℃下获得了具有纳米棒和八面体结构的LiMn2O4材料。恒流充放电结果表明，多面体球形LiMn2O4样品在高倍率和高温下表现出最好的电化学性能。在5℃下循环100次后，该电极在25℃和55℃下分别保持了94%和81%的容量，这归因于多面体球状尖晶石LiMn2O4对锰离子的溶解有抑制作用。通过Brunauer Emmett Teller(BET)、循环伏安(CV)和电化学阻抗谱(EIS)测试，发现多面体球形LiMn2O4样品具有最小的BET比表面积、最大的Li+扩散系数和最小的电荷转移电阻。本研究为LiMn2O4电极的容量衰减提供了一个新的视角，多面体结构的球形LiMn2O4有望成为锂离子电池的理想材料。
Polyhedron structured sphere-like lithium manganese oxide (LiMn2O4) is successfully synthesized from β-MnO2nanorod precursor via a solid state reaction at a temperature of 800 °C. For comparison, LiMn2O4materials with nanorod and octahedron structures are also obtained from β-MnO2nanorod precursor at temperatures of 700 °C and 900 °C, respectively. The galvanostatic charge–discharge result shows that the polyhedron sphere-like LiMn2O4sample exhibits the best electrochemical performance at high rate and high temperature. After 100 cycles at 5 C, this electrode is able to maintain 94% of its capacity at 25 °C and 81% at 55 °C. This is attributed to that the polyhedron sphere-like spinel LiMn2O4can suppress the dissolution of manganese ions. Based on Brunauer Emmett Teller (BET), cyclic voltammetry (CV) and electrochemical impedance spectroscopy (EIS), the polyhedron sphere-like LiMn2O4sample has the lowest BET surface area, largest diffusion coefficient of Li+and least charge transfer resistance. This study provides an insight into the capacity fading of LiMn2O4electrodes and the polyhedron structured sphere-like LiMn2O4can be a promising material for lithium ion batteries.
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