| 高温固相法合成LiNi1/3Mn1/3Co1/3O2及其性能研究 |
| Synthesis and Characterization of LiNi1/3Mn1/3Co1/3O2 by High Temperature Solid-state Method |
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| 摘要: 采用高温固相法合成出层状锂离子电池正极材料LiNi1/3Mn1/3Co1/3O2。通过XRD、ICP、SEM和电化学测试手段对产物的结构、组成、形貌及电化学性能进行了研究。XRD结果表明此方法合成的LiNi1/3Mn1/3Co1/3O2具有标准的α-NaFeO2型层状结构，SEM照片显示颗粒粒径大约在500 nm左右，粒径分布较窄。以20 mA·g-1电流密度放电，充放电电压在2.8～4.4 V之间，其首次放电比容量为170 mAh·g-1，40次循环容量保持率为85.3%。进一步加入石墨导电剂后，同样条件下首次放电比容量变为179 mAh·g-1，50次循环容量保持率为89.6%。容量衰减主要发生在前10次循环。XRD和SEM测试表明循环初期容量衰减的原因是由材料本体结构变化和界面反应共同作用的结果。 |
| 关键词: 锂离子电池 正极材料 LiNi1/3Mn1/3Co1/3O2 固相法 |
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| Abstract: The layered LiNi1/3Mn1/3Co1/3O2 cathode material for Li-ion batteries was synthesized by high temperature solid-state method. XRD， ICP， SEM and electrochemical measurements were used to characterize the structure， composition， appearance and electrochemical performances of the product. The XRD result showed that the as-prepared LiNi1/3Mn1/3Co1/3O2 could be indexed by a hexagonal α-NaFeO2 layered structure. The SEM images showed that the particle size was about 500 nm with narrow particle size distribution. The initial discharge capacity was 170 mAh·g-1 at a current density of 20 mA·g-1 between 2.8～4.4 V and the discharge capacity retention was 85.3% after 40 cycles. When graphite was further added into the conductive agent， the discharge capacity reached 179 mAh·g-1 and the capacity retention reached 89.6% after 50 cycles. The capacity degradation mainly occurred during the initial 10 cycles. XRD and SEM results showed that the capacity degradation was caused by the co-effect of structure change and interface reaction. |
| Keywords: Li-ion battery cathode material LiNi1/3Mn1/3Co1/3O2 solid-state method |
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| 郭 瑞,史鹏飞,程新群,李 娟.高温固相法合成LiNi1/3Mn1/3Co1/3O2及其性能研究[J].无机化学学报,2007,23(8):1387-1392. |
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