摘要
与未掺杂的尖晶石LiMn2O4进行比较,用固相混合合成法制得的结晶良好的尖晶石Li1.05Ni0.05Mn1.9O4正极材料在室温和55℃下的循环性能都能得到较大改善,首次放电容量在室温和55℃分别保持理论容量的92.6%和91.5%。在常温条件下,以0.5C充放电倍率循环50次,容量保持为首次放电容量的95.3%。采用非原位X射线衍射的方法对不同脱锂状态的Lix[Li0.05Ni0.05Mn1.9]O4(0.1<x<1)试样进行了结构分析。结果表明:Li、Ni的协同掺杂明显减小了晶格参数的变化,稳定了试样的结构及改善了电池循环性能。
Li1.05Ni0.05Mn1.9O4 cathode material with spinel structure was synthesized after solid-state mixing. Compared with spinel LiMn2 O4, the cyclic stability of Li1.05Ni0.05Mn1.9O4 was improved both at room temperature and 55℃. The first discharge capacities of Li1.05Ni0.05Mn1.9O4 are 92.6% and 91.5 % of the theoretical capacity at room temperature and 55℃. After 50 cycles with 0. 5 C charging-discharging rate at room temperature, the capacity is still 95.3% of the first discharging capacity. Ex-situ X-ray diffraction（XRD） was used to analyze the structures of different Li extraction states of Lix [Li1.05Ni0.05Mn1.9]O4 （0. 1〈x〈 1 ）. The results indicate that adding Li and Ni ions into LiMn2O4-based compound restrains the change of lattice parameter, stabilizes the structure of the sample and improves the cyclic performance.
出处
《中国有色金属学报》
EI
CAS
CSCD
北大核心
2005年第8期1300-1304,共5页
The Chinese Journal of Nonferrous Metals
基金
国家自然科学基金资助项目(50201014)
