Synthesis of nanosized Fe-Mn based Li-rich cathode materials for lithium-ion battery via a simple method

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• 作者：Yujuan Zhao ; ^{zhaoyujuan@bjut.edu.cn} ; Guoping Sun ; Rui Wu
• 关键词：Lithium ion batteries ; Fe-Mn based Li-rich materials ; Modified Pechini method
• 刊名：Electrochimica Acta
• 出版年：2013
• 出版时间：30 April, 2013
• 年：2013
• 卷：96
• 期：Complete
• 页码：291-297
• 全文大小：1160 K

文摘

The Fe-Mn based Li-rich materials, Li_1+x(Fe_yMn_1?y)_1?xO₂, are highly expected to be potential cathode materials for lithium ion batteries due to high capacity, good safety, environmental friendliness, and low cost. A simple synthesis route, the modified Pechini method, was employed to synthesize the nanosized Fe-Mn based Li-rich materials with excellent electrochemical performance. The structure, particles morphology, and dispersibility of the obtained materials are examined by X-ray diffraction (XRD), scanning electron microscope (SEM)and transmission electron microscope (TEM). The crystallinity and surface area of materials strongly depend on the calcination temperature. The samples calcined at low temperature with small particle size show high discharge capacity, but fast capacity fading due to the poor crystallinity. In order to solve this contradiction, the sample Li_1.26Fe_0.22Mn_0.52O₂ was calcined at low temperature (500 ¡ãC), then heated at high temperature for a short time. It possesses both small particle size and good crystallinity, exhibiting high discharge capacity of about 200 mAh g^?1 and improved cycleability. The rate performance is excellent that the discharge capacity is about 140 mAh g^?1 (1 C) and 110 mAh g^?1 (2 C), respectively.