| Mn含量对正极材料LiMn_xCo_(0.2)Ni_(0.8-x)O_2的结构与电化学性能的影响 |
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| 引用本文： | 姜斌,张永恒.Mn含量对正极材料LiMn_xCo_(0.2)Ni_(0.8-x)O_2的结构与电化学性能的影响[J].青岛科技大学学报,2010,31(1):26-31. |
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| 作者姓名： | 姜斌 张永恒 |
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| 作者单位： | 青岛科技大学材料科学与工程学院,山东青岛266042 |
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| 摘 要： | 通过共沉淀法合成了具有层状结构的锂离子电池正极材料LiMnxCo0.2-Ni0.8-xO2。采用XRD、XPS和恒流充放电等测试手段研究了Mn含量变化对正极材料LiMnxCo0.2Ni0.8-xO2的物理性质与电化学性能的影响。结果表明:Mn含量的增加会引起元素O和Ni的氧化态降低,使得Ni由+3价逐渐转变为+2价,而Mn的氧化态却始终保持+4价不变;尽管Mn含量的增加会使材料的充放电比容量有所降低,但是材料的结构稳定性和热稳定性会得到改善。XRD测试结果表明样品LiMnxCo0.2Ni0.8-xO2(0≤x≤0.5)都具有标准的-αNaFeO2层状结构。此外,从Mn含量的变化引起的样品晶胞参数的变化表明,当0≤x≤0.25时LiMnxCo0.2Ni0.8-xO2可能形成的是假固溶体,当Mn含量由0.3增加到0.5时形成的是真固溶体。
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| 关 键 词： | 锂离子电池 正极材料 LiMnxCo0.2Ni0.8-xO2 电化学性能 |
Effects of Manganese Content on the Structure and Electrochemical Performance of LiMn_xCo_(0.2)Ni_(0.8-x)O_2 Cathode Materials |
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| JIANGBin,ZHANGYong-heng.Effects of Manganese Content on the Structure and Electrochemical Performance of LiMn_xCo_(0.2)Ni_(0.8-x)O_2 Cathode Materials[J].Journal of Qingdao University of Science and Technology:Natutral Science Edition,2010,31(1):26-31. |
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| Authors: | JIANGBin ZHANGYong-heng |
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| Affiliation: | JIANG+Bin,ZHANG+Yong-heng(College+of+Materials+Science+,+Engineering,Qingdao+University+of+Science+,+Technology,Qingdao+266042,China) |
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| Abstract: | The layered materials LiMnxCo0.2Ni0.8-xO2 for lithium ion batteries had been prepared by co-precipitation and their properties had been characterized.By using XRD,XPS and constant current charge-discharge tests,the effects of Mn content in LiMnxCo0.2Ni0.8-xO2 on structure and electrochemical properties were investigated.With the increase of Mn content in LiMnxCo0.2Ni0.8-xO2,the oxidation state of O and Ni of the samples were decreased,in which the valence of Ni was reduced from +3 to +2,while Mn was +4.More... |
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| Keywords: | LiMnxCo0 2Ni0 8-xO2 |
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