摘要
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114.2 mAh.g-1和117.5mAh.g-1。
Some rare earth doping spinel LiMn1.98RE0.02O4（RE=Nd,Ce） cathode materials for lithium ion batteries were synthesized with the solid-state reaction method. The structure and characteristics of these produced samples were investigated by XRD, particle size distribution analysis and constant current charge-discharge testing. According to the microstructure, charge-discharge and cycle performance, the effect of doping rare earth on stabilizing the properties of the spinel material was analyzed. The results show that the doped materials have perfect spinel structure and the cycle performances of the materials are greatly improved both at normal temperature and high temperature. The discharge capacity of the sample LiMn1.98Ce0.02O4 and LiMn1.98Nd0.02O4 remained 114.2 mAh ·g^-1 and 117.5mAh·g^-1 after 50 cycles at normal temperature.
出处
《材料工程》
EI
CAS
CSCD
北大核心
2005年第11期35-37,63,共4页
Journal of Materials Engineering
基金
国家自然科学基金资助项目(20273047)
关键词
稀土
正极材料
锂离子电池
循环性能
rare earth
cathode materials
lithium-ion batteries
cycle performance
