Title掺Cr对LiMnO2的影响
Other TitlesEffect 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
KeywordsLiMnO2 Cr掺杂 电化学行为 LiMnO2 Cr substitution the electrochemistry behavior
LiMnO2
Cr substitution
the electrochemistry behavior
Issue Date2004
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.
URIhttp://hdl.handle.net/20.500.11897/254694
ISSN1002-185X
DOI10.3321/j.issn:1002-185X.2004.08.002
IndexedSCI(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)
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