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首页> 外文期刊>International Journal of Electrochemical Science >Molten Salt Synthesis of Disordered Spinel LiNi0.5Mn1.5O4 with Improved Electrochemical Performance for Li-ion Batteries
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Molten Salt Synthesis of Disordered Spinel LiNi0.5Mn1.5O4 with Improved Electrochemical Performance for Li-ion Batteries

机译：锂离子电池电化学性能改善的无序尖晶石型LiNi 0.5 Mn 1.5 O 4 的熔融盐合成

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Disordered spinel LiNi0.5Mn1.5O4 (LNMO) was successfully synthesised via a molten-salt methodusing a mixture of LiOH?H2O and LiNO3 salts. The precursor was annealed at 750, 850 or 950 °C for12 h, and the effects of calcination temperature on the structure, morphology and electrochemicalperformance of the resultant LNMO were investigated. At 850 ?C, LNMO exhibited a polyhedralshape approximately 0.75 μm in size with a specific surface area of 1.8135 m2 g?1. Electrochemicalresults indicated that, among the samples tested, the LNMO sample annealed at 850 °C exhibited thehighest discharge capacity of 122 mAh g?1 at the 1st cycle; these samples also retained 97% of itscapacity after 80 rounds of cycling at a rate of 0.2 C. The same sample showed excellent ratecapability, indicating exceptional performance even at a high current density. The improvedperformance of the resulting electrode could be attributed to the homogeneity and small size of theLNMO particles; these characteristics help facilitate Li-ion transport by reducing the Li-ion pathwaywithin the electrode material.
机译：通过使用LiOH2H2O和LiNO3盐的混合物的熔融盐法成功合成了无序尖晶石LiNi0.5Mn1.5O4（LNMO）。将前驱体在750、850或950℃退火12小时，并研究了煅烧温度对所得LNMO的结构，形态和电化学性能的影响。在850°C时，LNMO呈现多面体形状，尺寸约为0.75μm，比表面积为1.8135 m2 g？1。电化学结果表明，在所测试的样品中，在850°C退火的LNMO样品在第一个循环中表现出最高的放电容量122 mAh g？1。这些样品在以0.2 C的速率循环80次后，还保留了97％的容量。同一样品显示出极好的速率能力，即使在高电流密度下也表现出出色的性能。所得电极性能的提高可归因于LNMO颗粒的均质性和小尺寸。这些特性通过减少电极材料内的锂离子通道，有助于促进锂离子的运输。

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