高等学校化学学报 ›› 2005, Vol. 26 ›› Issue (1): 138.

• 研究论文 • 上一篇    下一篇

掺钛尖晶石锂锰氧化物的合成、结构及电化学性能研究

童庆松1,2, 刘汉三1, 林素英2, 杨勇1   

  1. 1. 厦门大学固体表面物理化学国家重点实验室,厦门 361005;
    2. 福建师范大学化学与材料学院,福州 350007
  • 收稿日期:2003-10-28 出版日期:2005-01-10 发布日期:2005-01-10
  • 通讯作者: 杨 勇(1963年出生),男,博士,教授,博士生导师,从事现代电化学研究.E-mail:yyang@xmu.edu.cn E-mail:yyang@xmu.edu.cn
  • 基金资助:

    教育部重点项目(批准号:03065);国家自然科学基金(批准号:29925310)资助

Synthesis, Structure and Electrochemical Performance of Titanium-doped Spinel Lithium Manganese Oxides

TONG Qing-Song1,2, LIU Han-Shan1, LIN Su-Ying2, YANG Yong1   

  1. 1. State Key Laboratory of Physical Chemistry of Solid Surface, Xiamen University, Xiamen 361005, China;
    2. College of Chemistry and Material, Fujian Normal University, Fuzhou 350007, China
  • Received:2003-10-28 Online:2005-01-10 Published:2005-01-10

摘要: 以掺钛电解二氧化锰为锰源合成了一系列掺钛尖晶石锂锰氧化物样品.实验结果表明,无论是在新制样品40次循环的充放电实验中,还是在经过40次循环充放电并在放电状态下贮藏3个月的再次充放电实验中,掺钛样品均具有极好的电化学性能.600℃掺钛样品在第一循环中的放电容量达到206mA·h/g.在放电态贮藏3个月后,再次充放电实验中,第一循环的放电容量达到144mA·h/g.XRD分析表明,掺钛样品仍然具有立方结构.还用红外和拉曼光谱技术研究了钛对尖晶石锂锰氧化物的电化学性能的改善作用.

关键词: 掺钛尖晶石锂锰氧化物, 掺杂改性, 贮存性能, 振动光谱

Abstract: A series of titanium|doped lithium manganese oxides spinel samples were synthesized by using titanium-doped electrolytic manganese dioxide sample as the manganese sources. It is shown that the titanium|doped samples possess an excellent electrochemical performance whether for 40-charge-discharge-cycle or for second 40-charge-discharge-cycle with samples which stored in the discharged state for 3 months after 40 charge-discharge cycles. The titanium|doped sample synthesized at 600 ℃ possesses a discharge capacities of 206 mA·h/g in the 1st cycle and that of 144 mA·h/g in the 1st cycle after being stored. X-ray diffraction analysis showed that titanium|doped lithium manganese oxides possesses a cubic structure. The vibrational spectroscopic techniques(i.e. IR, Raman) were employed to investigate why titanium can obviously improve the electrochemical performance of spinel lithium manganese oxides.

Key words: Titanium, doped spinel lithium manganese oxides, Improved performance with doping, Stored performance, Vibrational spectra

中图分类号: 

TrendMD: