Title | 掺Cr对LiMnO2的影响 |
Other Titles | Effect of Cr Doping on LiMnO2 |
Authors | 谷亦杰 周恒辉 常文保 Gu Yijie Zhou Henghui Chang Wenbao |
Affiliation | 北京大学,北京,100871 Peking University,Beijing 100871,China |
Keywords | LiMnO2 Cr掺杂 电化学行为 LiMnO2 Cr substitution the electrochemistry behavior LiMnO2 Cr substitution the electrochemistry behavior |
Issue Date | 2004 |
Publisher | 稀有金属材料与工程 |
Citation | 稀有金属材料与工程.2004,33,(8),789-792. |
Abstract | 采用固相反应合成了LiMnO2和LiMn0.9Cr0.1O2,Cr的加入改变了LiMnO2的结构,与LiMnO2 正交结构(空间群 Pmnm)相比,LiMn0.9Cr0.1O2具有单斜结构(空间群 C2/m).充放电过程中,LiMnO2和LiMn0.9Cr0.1O2结构产生向尖晶石结构的不可逆转变.在首次放电过程中,LiMnO2只存在2.9 V的电压平台,随着循环次数的增加,在2.9 V和4 V电压平台容量都有所增加.与LiMnO2不同,LiMn0.9Cr0.1O2在首次放电过程中存在有2.9 V和4 V电压平台,随着循环次数的增加,4 V电压平台容量逐渐减小,在一定循环次数下,只有2.9 V的电压平台存在.因此,Cr的掺杂不仅改变了LiMnO2的结构,而且改变其电化学行为. LiMnO2 and LiMn0.9Cr0.1O2 were prepared by a high temperature solid-state route. In comparison with orthorhombic LiMnO2, monoclinic LiMnO2 was formed with Cr substitution. The research shows that the irreversible transformation to spinel-like structure during LiMnO2 cycling is a gradual phase transformation process. In comparison with the 2.9 V and 4 V plateaus of LiMnO2, LiMn0.9Cr0.1O2 shows only 2.9 V plateau for further cycling. So it is clear that the electrochemistry behavior change from LiMnO2 to LiMn0.9Cr0.1O2 phase is due to doping of Cr. |
URI | http://hdl.handle.net/20.500.11897/254694 |
ISSN | 1002-185X |
DOI | 10.3321/j.issn:1002-185X.2004.08.002 |
Indexed | SCI(E) EI 中文核心期刊要目总览(PKU) 中国科技核心期刊(ISTIC) 中国科学引文数据库(CSCD) |
Appears in Collections: | 待认领 |