Surface Modification of Li1.2Ni0.13Mn0.54Co0.13O2 by Hydrazine Vapor as Cathode Material for Lithium-Ion Batteries

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• 作者：Jie Zhang ; Zhihong Lei ; Jiulin Wang ; Yanna NuLi ; Jun Yang
• 刊名：ACS Applied Materials & Interfaces
• 出版年：2015
• 出版时间：July 29, 2015
• 年：2015
• 卷：7
• 期：29
• 页码：15821-15829
• 全文大小：621K
• ISSN：1944-8252

文摘

An artificial interface is successfully prepared on the surface of the layered lithium-rich cathode material Li_1.2Ni_0.13Mn_0.54Co_0.12O₂ via treating it with hydrazine vapor, followed by an annealing process. The inductively coupled plasma-atomic emission spectrometry (ICP) results indicate that lithium ions are leached out from the surface of Li_1.2Ni_0.13Mn_0.54Co_0.12O₂ by the hydrazine vapor. A lithium-deficiency-driven transformation from layered to spinel at the particle surface happens in the annealing process, which is proved by the results of X-ray diffraction (XRD) and high-resolution transmission electron microscope (HRTEM). It is also found that the content of the spinel phase increases at higher annealing temperature, and an internal structural evolution from Li_1鈥?i>xM₂O₄-type spinel to M₃O₄-type spinel takes place simultaneously. Compared to the pristine Li_1.2Ni_0.13Mn_0.54Co_0.12O₂, the surface-modified sample annealed at 300 掳C delivers a larger initial discharge capacity of 295.6 mA h g^鈥? with a Coulombic efficiency of 89.5% and a better rate performance (191.7 mA h g^鈥? at 400 mA g^鈥?).