Improved High-rate Capability of Li(Ni0.5CoyMn1.5-y)O4-zFz Spinel Materials for 5 V Lithium Secondary Batteries
Improved High-rate Capability of Li(Ni0.5CoyMn1.5-y)O4-zFz Spinel Materials for 5 V Lithium Secondary Batteries
复制标题
DOI：
--
复制
发表时间：
2007
期刊：
影响因子：
--
通讯作者：
S. Oh;S. Park;E. Jung;Y. Bae;Yangfang Sun
中科院分区：
文献类型：
--
作者：
S. Oh;S. Park;E. Jung;Y. Bae;Yangfang Sun
研究了以钴、氟取代锰、氧对Li（Ni0.5CoyMn1.5-y）O 4-zFz正极材料结构和电化学性能的影响。采用超声喷雾热解法在900 ℃下成功合成了纯相Li（Ni0.5CoyMn1.5-y）O 4-zFz（y = 0 - 1.0，z = 0 - 0.1）尖晶石材料。采用X射线衍射（XRD）、Rietveld精修、扫描电镜（SEM）、能谱（EDS）、BET比表面积（BET）和恒电流充放电测试等手段对Li（Ni 0.5CoyMn 1.5-y）O 4-zFz（y = 0 - 1.0，z = 0 - 0.1）粉体进行了表征。钴和氟的取代对于改善高电流放电能力是有效的，即使电极以1，350 mA g-1（10 C-速率）的放电电流密度循环。
The effects of substituting cobalt and fluorine for manganese and oxygen on the structural and electro- chemical properties of Li(Ni0.5CoyMn1.5-y)O4-zFz cathode materials were studied. The pure phase Li(Ni0.5Coy Mn1.5-y)O4-zFz (y = 0 - 1.0, z = 0 - 0.1) spinel materials were successfully synthesized at 900 o C by an ultrasonic spray pyrolysis method. The Li(Ni0.5CoyMn1.5-y)O4-zFz (y = 0 - 1.0, z = 0 - 0.1) powders were characterized by means of X-ray diffraction (XRD), Rietveld refinements, scanning electron microscopy (SEM), energy dis- persive spectra (EDS), Brunauer-Emmett-Teller (BET) analysis, and galvanostatic charge/discharge testing. The cobalt and fluorine substitutions were effective for improving the high current discharge capability, even though the electrode was cycled with a discharge current density of 1,350 mA g -1 (10 C-rate).