Simultaneous surface coating and chemical activation of the Li-rich solid solution lithium rechargeable cathode and its improved performance

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• 作者：Yingqiang Wu ; Jun Ming ; Linhai Zhuo ; Yancun Yu ; Fengyu Zhao
• 关键词：Lithium-rich cathode ; Coulombic efficiency ; Surface treatment ; Alumina coating
• 刊名：Electrochimica Acta
• 出版年：15 December, 2013
• 年：2013
• 卷：113
• 期：Complete
• 页码：54-62
• 全文大小：2710 K

文摘

In this study, highly dispersive spherical Li-rich solid solution (Li_1.2Mn_0.54Ni_0.13Co_0.13O₂) particles are successfully synthesized by a co-precipitation method. Then these particles are treated with aluminum nitrates ethanol solution at 80 掳C. The treatment can extract lithium (Li₂O) from the Li₂MnO₃ component in the composite of Li_1.2Mn_0.54Ni_0.13Co_0.13O₂. Simultaneously, a thin layer of Al₂O₃ can be precipitated on the surface of the electrode particles via direct thermal decomposition of aluminum nitrates. After treatment, the first-cycle coulombic efficiency of the electrode increases from 72.1% to 93.6%, meanwhile it shows a superior cycling stability at 100 mA g^鈭? with a discharge capacity of around 220 mAh g^鈭? and retention of 92.5% after 100 cycles, which is much higher than that of the pristine electrode (83.2%). Even at a high current density of 2 A g^鈭? (10 C), the discharge capacity could still achieve and well maintain as high as 140 mAh g^鈭?.