Enhanced electrochemical performances of Li_1.2Ni_0.2Mn_0.6O₂ cathode materials by coating LiAlO₂ for lithium-ion batteries

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• 作者：L.L. Zhang^a ; J.J. Chen^a ; ^b ; S. Cheng^a ; H.F. Xiang^a ; ^{hfxiang@hfut.edu.cn" class="auth_mail" title="E-mail the corresponding author}
• 关键词：Lithium-ion batteries ; Lithium-rich layered oxides ; Lithium aluminate ; Surface coating
• 刊名：Ceramics International
• 出版年：2016
• 出版时间：January 2016
• 年：2016
• 卷：42
• 期：1
• 页码：1870-1878
• 全文大小：2283 K

文摘

LiAlO₂-coated Li_1.2Ni_0.2Mn_0.6O₂ lithium-rich layered oxide was prepared and investigated as cathode material for lithium-ion batteries. X-ray diffraction (XRD) and high resolution transmission electron microscopy (HR-TEM) analyses revealed that a uniform LiAlO₂ layer was coated on the surface of Li_1.2Ni_0.2Mn_0.6O₂ particles. The LiAlO₂-coated Li_1.2Ni_0.2Mn_0.6O₂ exhibited a great improvement on electrochemical performance, especially for its excellent cycling stability both at room and elevated temperature, compared to the pristine Li_1.2Ni_0.2Mn_0.6O₂. In addition, the LiAlO₂-coated Li_1.2Ni_0.2Mn_0.6O₂ showed obviously enhanced rate capability (162.6 mA h g⁻¹ at 2 C and 112.3 mA h g⁻¹ at 5 C) and suppressed the voltage fading during long-term and high-rate cycling. Based on these results, LiAlO₂ coating would be a promising method to improve the electrochemical performance of lithium-rich layered oxides.