Influence of lithium content on the electrochemical performance of Li_1+x(Mn_0.533Ni_0.233Co_0.233)_{1鈭?span style='font-style: italic'>x}O₂ cathode materials

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• 作者：Zhaohui Tang ; Zhixing Wang ; ^{tangzh106@163.com} ; Xinhai Li ; Wenjie Peng
• 关键词：Cathode ; Lithium-ion batteries ; Rate capability ; Cycle performance
• 刊名：Journal of Power Sources
• 出版年：2012
• 期刊代码：58_03787753
• 类别：ce
• 出版时间：15 June, 2012
• 卷：208
• 期：Complete
• 页码：237-241
• 文件大小：635 K

摘要

Li-rich Mn-based Li_1+x(Mn_0.533Ni_0.233Co_0.233)_1鈭?em>xO₂ (x = 0, 0.045, 0.09, 0.135, 0.18, 0.225) materials have been prepared by a conventional solid-state reaction. XRD, SEM and half-cell tests are investigated on the influence of Li content. Pure phase can be obtained when Li-excessive value x keeps between 0.045 and 0.18. The initial efficiency (Q_1d/Q_1c) almost keeps the same level of 70%for different Li-excessive samples. Li_1.045Mn_0.509Ni_0.223Co_0.223O₂ sample shows highest discharge capacity of 259.8 mA h g^鈭?. Li_1.09Mn_0.486Ni_0.212Co_0.212O₂ sample exhibits the best rate capability, and almost no reduction is observed after 24-time cycles in different discharge current density.