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Synthesis and Characterization of Sc doped Li1+xScyMn2-yO4Spinel Cathode Material for Li ion Batteries
Zhao Xuemei1, Zhou Fu1, Zhang Zude*1, Shen Tao2, Tang Chenming2, Wang Xinwei2
1.Department of Chemistry, University of Science and Technology of China, Hefei 230026;2.Highstar Chemical Power Source Co.Ltd., Qidong 226200
Abstract:
A series of Sc3+-doped spinel lithium manganese oxides Li1+xScyMn2-yO4(y=0.01, 0.02, 0.06, and 0.10)were synthesized by solid state reaction using LiOH·H2O, MnO2, and Sc2O3 as starting materials. The results of powder X-ray diffraction indicated that the doped Li1+xScyMn2-yO4 maintain the cubic structure of spinel phase Fd3m. The electrochemical properties were characterized by electrochemical methods. The initial discharge capacity reached 135 mAh/g and the capacity fading rate was less than 2% after 40 cycles. The spinel phase was well preserved after 40 cycles. The doping of Sc3+ effectively improved the cycleability of spinels, and was a promising way for the improvement of spinel LiMn2O4 cathode materials.
Key words:  Spinel LiMn2O4, Li ion batteries, Solid state reaction, Ion doping
FundProject:
附件
Sc3+掺杂的尖晶石型LiMn2O4正极材料制备及性质
赵雪梅1, 周复1, 张祖德*1, 沈涛2, 唐琛明2, 王兴威2
1.中国科学技术大学化学系,合肥,230026;2.海四达化学电源公司,启东,226200
摘要:
采用固相分段反应的方法,以LiOH·H2O、 MnO2和Sc2O3为原料,合成了一系列Sc3+掺杂的尖晶石型锂离子电池正极材料Li1+xScyMn2-yO4(y=0.01、 0.02、 0.06、 0.10).利用X射线衍射测试研究了材料的结构,掺杂后的Li1+xScyMn2-yO4保持了尖晶石相Fd3m结构.测试了材料的电化学性能,初次放电容量最高可达到135 mAh/g, 40次循环后容量衰减率小于2%, X射线衍射测试显示尖晶石相得到了很好的保持. Sc3+掺杂显著提高了尖晶石型LiMn2O4材料的性能.
关键词:  尖晶石型LiMn2O4  锂离子电池  固相反应  离子掺杂
DOI:10.1088/1674-0068/18/2/233-236
分类号: