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材料工程  2005 

尖晶石LiMn1.98RE0.02O4(RE=Ce,Nd)及其性能研究

Keywords: 稀土,正极材料,锂离子电池,循环性能

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Abstract:

采用传统的高温固相法合成了稀土掺杂改性的锂离子电池用正极材料LiMn1.98RE0.02O4(RE=Nd,Ce)。用XRD、激光粒径和恒电流充放电测试对材料的结构和性能进行了表征。从材料的晶体结构、充放电和循环性能等方面分析了掺杂元素在稳定材料性能中的作用。研究结果表明,掺杂后的材料仍为尖晶石结构,常温和高温下的循环性能都得到了明显改善。常温下50次循环后LiMn1.98Ce0.02O4和LiMn1.98Nd0.02O4的放电比容量分别维持在114.2mAh·g-1和117.5mAh·g-1。

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