Molten salt synthesis of LiNi0.5Mn1.5O4 spinel for 5 V class cathode material of Li-ion secondary battery
Molten salt synthesis of LiNi0.5Mn1.5O4 spinel for 5 V class cathode material of Li-ion secondary battery
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DOI：
10.1016/j.electacta.2003.07.003
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发表时间：
2004-01
影响因子：
6.6
通讯作者：
Jung-Hyun Kim;Seung‐Taek Myung;Yang‐Kook Sun
中科院分区：
文献类型：
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作者：
Jung-Hyun Kim;Seung‐Taek Myung;Yang‐Kook Sun
用LiCl和LiOH盐的混合物，用熔盐法很容易地合成了有序的高晶态LiNi0.5Mn1.5O4尖晶石。研究了合成气氛、氯化锂用量、合成温度、合成时间等合成条件对LiNi0.5Mn1.5O4合成的影响。X射线衍射图和扫描电子显微镜照片表明，在90 0℃和95 0℃合成的LiNi0.5Mn1.5O4具有清晰的八面体尺寸的立方尖晶石结构(Fd3̄m)。LiNi0.5Mn1.5O4尖晶石相在1000℃左右开始分解，伴随着结构和形态的退化。在900℃下反应3h合成的LiNi0.5Mn1.5O4粉末首次放电容量为139mAhg，50次循环后的容量保持率大于99%。
Well-ordered high crystalline LiNi0.5Mn1.5O4spinel has been readily synthesized by a molten salt method using a mixture of LiCl and LiOH salts. Synthetic variables on the synthesis of LiNi0.5Mn1.5O4, such as synthetic atmosphere, LiCl salt amount, synthetic temperature, and synthetic time, were intensively investigated. X-ray diffraction (XRD) patterns and scanning electron microscopic (SEM) images showed that LiNi0.5Mn1.5O4synthesized at 900 and 950°C have cubic spinel structure (Fd 3 ̄ m ) with clear octahedral dimension. LiNi0.5Mn1.5O4spinel phase began to decompose at around 1000°C accompanied with structural and morphological degradation. LiNi0.5Mn1.5O4powders synthesized at 900°C for 3h delivered an initial discharge capacity of 139mAh/g with excellent capacity retention rate more than 99% after 50 cycles.