Transactions of Nonferrous Metals Society of China The Chinese Journal of Nonferrous Metals

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中国有色金属学报

ZHONGGUO YOUSEJINSHU XUEBAO

第23卷    第6期    总第171期    2013年6月

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文章编号:1004-0609(2013)06-1626-07
液相Al3+掺杂LiAlxMn2-xO4的化学合成及其电化学性能
杨 婧,尹周澜,王志兴,郭华军,吴贤文,冉 盈

(中南大学 化学化工学院, 长沙 410083)

摘 要: 采用工业上常用的碳酸锰热解法制备锰氧化物前驱体,与Li2CO3混合后焙烧得到锂离子电池正极材料LiMn2O4,并在碳酸锰制备过程中掺入铝离子制备LiAlxMn2-xO4( x=0.01,0.02,0.03,0.05,0.1)。通过X射线衍射(XRD)和扫描电镜(SEM)对样品进行表征,并对合成材料在常温和高温(55 ℃)下的电化学性能进行研究。结果表明:合成的前驱体及锰酸锂材料均无杂相;随着Al3+掺杂量的增加,LiAlxMn2-xO4颗粒尺寸不断长大;材料的首次充放电比容量随Al3+掺杂量的升高而下降,但循环性能提高;Al3+的掺入极大地提高了材料的循环性能,尤其是在高温条件下,当掺杂量x=0.05时, 1C倍率下循环100次容量的保持率由未掺杂的72.2%升高到90.7%。

 

关键字: 正极材料;锰酸锂;掺杂;LiAlxMn2-xO4;循环性能

Chemosynthesis and electrochemical properties of LiAlxMn2-xO4 doped with liquid Al3+
YANG Jing, YIN Zhou-lan, WANG Zhi-xing, GUO Hua-jun, WU Xian-wen, RAN Ying

School of Chemistry and Chemical Engineering, Central South University, Changsha 410083, China

Abstract:The spinel LiMn2O4 was synthesized by manganese carbonate pyrolysis method and Al3+ was doped during the MnCO3 synthesis process to get LiAlxMn2-xO4 (x=0.01, 0.02, 0.03, 0.05, 0.1). The samples were analyzed by X-ray diffraction (XRD), scanning electron microscopy (SEM) and their electrochemical performance were tested at room temperature and elevated temperature (55 ℃). The results of MnCO3 and LiMn2O4 have no apparent. With the increase of the doping amounts of Al3+, the particle sizes of LiAlxMn2-xO4 become larger, and the first discharge capacity of LiMn2O4 decrease to some degree. But the LiAlxMn2-xO4 electrode exhibits superior cycling performance. Especially, at elevated temperature (55 ℃), the capacity retention increases from 72.2% for LiMn2O4 to 90.7% for LiAl0.05Mn1.95O4 after 100 cycles at 1C.

 

Key words: cathode materials; lithium manganate oxide; dope; LiAlxMn2-xO4; cycling performance

ISSN 1004-0609
CN 43-1238/TG
CODEN: ZYJXFK

ISSN 1003-6326
CN 43-1239/TG
CODEN: TNMCEW

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