| 锂离子蓄电池正极材料LiMn2-x-y-zTlxAlyMzO4(M=Co、Cr、Ni)的合成及电化学性能研究 | |
| Synthesis and Electrochemical Performance Studies of LiMn2-x-y-zTlxAlyMzO4(M=Co， Cr and Ni) Cathode Materials for Lithium-Ion Secondary Batteries | |
| 摘要: 采用同时掺杂Tl、Al和M(M=Co、Cr和Ni)三种金属原子和改进固相反应的方法合成了复合尖晶石正极材料 LiMn2-x-y-zTlxAlyMzO4，并采用XRD、SEM、TEM、循环伏安和电化学测试考察了它的物理性质和电化学性能。结果表明，所合成的正极材料具有与母体LiMn2O4尖晶石同样完整的尖晶石结构，规则的形貌和均匀的粒径分布。当M为Co和Cr时，目标材料的平均粒径约800nm，且具有良好的电化学性能，其首次充电容量分别为123.70mAh·g-1和121.30mAh·g-1，首次放电容量分别为117.30mAh·g-1和115.70mAh·g-1。当M为Ni时，材料的电化学性能相对较差。循环伏安和充放电曲线表明该正极材料的充放电分别为两步脱锂和插锂机理。当Li掺杂量较小时，目标材料在充放电过程中均各有两个平台。随着Li掺杂量的增加，充放电平台有由两个逐渐转变为一个的趋势。当M为Co或Cr时，该正极材料不仅拥有较高的比容量和常温循环稳定性能，而且还具有较优良的高温循环稳定性能，这可能主要归因于三种金属的协同作用使目标材料的结构更加稳定，这也使该材料有可能成为电动车电池的较佳正极材料。 | |
| 关键词: 锂离子蓄电池 正极材料 复合尖晶石 Tl，Al，Co，Cr，Ni共掺杂 | |
| 基金项目: | |
| Abstract: The complex LiMn2-x-y-zTlxAlyMzO4(M=Co， Cr and Ni) cathode materials with spinel-type structure were synthesized by co-doping Tl， Al and M atoms at the same time and using improved solid state reaction， and their physical and electrochemical properties were investigated by XRD， SEM， TEM， CV and electrochemical testing. The electrochemical performances of as-synthesized cathode materials at 25℃ and 55℃ were studied and measured. The results demonstrated that the as-synthesized cathode materials have complete spinel structure the same as parent LiMn2O4 spinel， the samples have uniform morphology and normal grain-size distribution. When M is Co and Cr， the mean size of the resulted samples is 800nm， and the initial charge capacity of LiMn1.90Tl0.05Al0.02M0.03O4 cathode materials was 123.70mAh·g-1 and 121.30mAh·g-1， respectively， and the discharge capacity of LiMn1.90Tl0.05Al0.02M0.03O4 is 117.30mAh·g-1 and 115.70mAh·g-1， respectively. Whereas M is Ni， the result of the corresponding cathode material is poor， the initial charge and discharge capacity is only 109.20mAh·g-1 and 99.78mAh·g-1. The cathode material has two charge and discharge plateaus in the course of charge and discharge respectively when M is Co， Cr or/and Ni. The two plateaus have the tendency of gradually becoming into only one plateau with the increase of lithium dopant amount. When M is Co or/and Cr， the resulted cathode materials have excellent room temperature (25℃) and higher temperature (55℃) performances， which can be attributed to the synergistic interaction between these metals， the synergistic interaction increases the stability of the cathode ma-terials. These properties make the cathode materials become the promising cathode materials and widely applied in the future electric vehicles(EV) and hybrid electric vehicles(HEV) batteries. | |
| Keywords: lithium-ion secondary batteries cathode material complex spinel Tl,Al,Co,Cr,Ni co-dopants | |
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| 刘兴泉,钟辉,唐毅,李淑华,林晓静,何泽珍.锂离子蓄电池正极材料LiMn2-x-y-zTlxAlyMzO4(M=Co、Cr、Ni)的合成及电化学性能研究[J].无机化学学报,2003,19(5):467-472. | |
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