Spherical Agglomeration of Octahedral LiNi0.5Co4xMn1.5–3xO4 Cathode Material Prepared by a Continuous Coprecipitation Method for 5 V Lithium-Ion Batteries

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• 作者：Yue Yang ; Shuang Li ; Qin Zhang ; Yun Zhang ; Shengming Xu
• 刊名：Industrial & Engineering Chemistry Research
• 出版年：2017
• 出版时间：January 11, 2017
• 年：2017
• 卷：56
• 期：1
• 页码：175-182
• 全文大小：569K
• ISSN：1520-5045

文摘

Octahedral LiNi_0.5Mn_1.5O₄ with excellent electrochemical properties prepared by the solvothermal or sol–gel method under harsh conditions is expensive. Therefore, preparing octahedral LiNi_0.5Mn_1.5O₄ with good granularity by a more cost-effective and large-scale method is significant for its industrial applications. In this study, spherical agglomerations of octahedral Co-doped LiNi_0.5Co_4xMn_1.5–3xO₄ with micrometer sizes were synthesized by a continuous coprecipitation process. Compared to conventional spherical LiNi_0.5Mn_1.5O₄, the spherical agglomeration of octahedral LiNi_0.5Co_0.08Mn_1.44O₄ with a larger specific surface area and pore volume was well crystallized without any impurities and exhibited a high discharge capacity of about 110 mAh·g^–1 at a rate of 2C and a high reversible capacity of 99.9% after the rate test (in which rates of 0.1C, 0.5C, 1C, and 2C were tested sequentially for 10 cycles). Remarkably, the discharge capacity of the prepared LiNi_0.5Co_0.08Mn_1.46O₄ exhibited a negligible decrement after 100 cycles at 1C, displaying great potential industrial application for 5 V lithium-ion batteries.