Surface Structure Evolution of LiMn2O4 Cathode Material upon Charge/Discharge

CORC > 物理研究所 > 物理所公开发表论文 > 期刊论文

	Surface Structure Evolution of LiMn2O4 Cathode Material upon Charge/Discharge
	Tang, DC ; Sun, Y ; Yang, ZZ ; Ben, LB ; Gu, L ; Huang, XJ
刊名	CHEMISTRY OF MATERIALS
	2014
卷号	26 期号:11 页码:3535
ISSN号	0897-4756
通讯作者	Gu, L (reprint author), Chinese Acad Sci, Beijing Natl Lab Condensed Matter Phys, Inst Phys, Beijing 100190, Peoples R China.
中文摘要	Surface dissolution of manganese is a long-standing issue hindering the practical application of spine! LiMn2O4 cathode material, while few studies concerning the crystal structure evolution at the surface area have been reported. Combining X-ray photoelectron spectroscopy, electron energy loss spectroscopy, scanning transmission electron microscopy, and density functional theory calculations, we investigate the chemical and structural evolutions on the surface of a LiMn2O4 electrode upon cycling. We found that an unexpected Mn3O4 phase was present on the surface of LiMn2O4 via the application of an advanced electron microscopy. Since the Mn3O4 phase contains 1/3 soluble Mn2+ ions, formation of this phase contributes significantly to the Mn2+ dissolution in a LiMn2O4 electrode upon cycling. It is further found that the Mn3O4 appears upon charge and disappears upon discharge, coincident with the valence change of Mn. Our results shed light on the importance of stabilizing the surface structure of cathode material, especially at the charged state. The understanding of the manganese dissolution reaction that occurs in the LiMn2O4 can certainly be extended to other oxide cathodes.
资助信息	National Basic Research Program of China [2013CB934002]; Chinese Academy of Sciences [XDA01020304]
语种	英语
公开日期	2015-04-14
内容类型	期刊论文
源URL	[http://ir.iphy.ac.cn/handle/311004/58956]
专题	物理研究所_物理所公开发表论文_物理所公开发表论文_期刊论文
推荐引用方式 GB/T 7714	Tang, DC,Sun, Y,Yang, ZZ,et al. Surface Structure Evolution of LiMn2O4 Cathode Material upon Charge/Discharge[J]. CHEMISTRY OF MATERIALS,2014,26(11):3535.
APA	Tang, DC,Sun, Y,Yang, ZZ,Ben, LB,Gu, L,&Huang, XJ.(2014).Surface Structure Evolution of LiMn2O4 Cathode Material upon Charge/Discharge.CHEMISTRY OF MATERIALS,26(11),3535.
MLA	Tang, DC,et al."Surface Structure Evolution of LiMn2O4 Cathode Material upon Charge/Discharge".CHEMISTRY OF MATERIALS 26.11(2014):3535.