The structure, morphology, and electrochemical properties of Li_1+xNi_1/6Co_1/6Mn_4/6O_2.25+x/2 (0.1 鈮?#xa0;x 鈮?#xa0;0.7) cathode materials

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• 作者：Jun Wang ; Guoxia Yuan ; Minghao Zhang ; Bao Qiu ; Yonggao Xia ; ^{xiayg@nimte.ac.cn} ; Zhaoping Liu ; ^{liuzp@nimte.ac.cn}
• 关键词：Lithium ion battery ; Cathode material ; Layered Li-rich ; Co-precipitation
• 刊名：Electrochimica Acta
• 出版年：2012
• 期刊代码：30_00134686
• 类别：ch
• 出版时间：1 April, 2012
• 卷：66
• 期：Complete
• 页码：61-66
• 文件大小：1167 K

摘要

Li_1+xNi_1/6Co_1/6Mn_4/6O_2.25+x/2 (0.1 鈮?#xA0;x 鈮?#xA0;0.7) cathode materials have been synthesized by a simple carbonate co-precipitation method. The effects of the lithium content on the structure, physical property, and electrochemical performance of the samples have been investigated. As the increase of lithium content, the Li_1+xNi_1/6Co_1/6Mn_4/6O_2.25+x/2 evolves from a mixture of hexagonal R鈭?m, monoclinic C2/m, and spinel Fd鈭?m structure to a mixture of hexagonal and monoclinic structure, accompanied with less cation mixing between Li⁺ and Ni²⁺. The increase of x value also affects the size of the primary particles and the roughness of the secondary particles. The Li_1+xNi_1/6Co_1/6Mn_4/6O_2.25+x/2 with appropriate lithium content, e.g., x = 0.3, thereby small particle size, high pellet density, and low cation mixing, brings on the largest discharge capacity, which is more than 288 mAh g^鈭? in the voltage range of 2.0-4.8 V at 25 mA g^鈭?, and the lowest irreversible capacity loss of 47 mAh g^鈭? among these cathode materials.