Synthesis of porous nano/micro structured LiFePO₄/C cathode materials for lithium-ion batteries by spray-drying method

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• 作者：Xiao-mei GUAN^a ; ^b ; Guo-jun LI^a ; ^b ; ^{ligj@djtu.edu.cn} ; Chun-yang LI^a ; Rui-ming REN^a
• 关键词：LiFePO4/C cathode ; nano/micro structure ; porous material ; spray drying ; electrochemical properties
• 刊名：Transactions of Nonferrous Metals Society of China
• 出版年：2017
• 出版时间：January 2017
• 年：2017
• 卷：27
• 期：1
• 页码：141-147
• 全文大小：2698 K
• 卷排序：27

文摘

In order to enhance electrochemical properties of LiFePO4 (LFP) cathode materials, spherical porous nano/micro structured LFP/C cathode materials were synthesized by spray drying, followed by calcination. The results show that the spherical precursors with the sizes of 0.5–5 μm can be completely converted to LFP/C when the calcination temperature is higher than 500 °C. The LFP/C microspheres obtained at calcination temperature of 700 °C are composed of numerous particles with sizes of ∼20 nm, and have well-developed interconnected pore structure and large specific surface area of 28.77 m2/g. The specific discharge capacities of the LFP/C obtained at 700 °C are 162.43, 154.35 and 144.03 mA·h/g at 0.5C, 1C and 2C, respectively. Meanwhile, the capacity retentions can reach up to 100% after 50 cycles. The improved electrochemical properties of the materials are ascribed to a small Li+ diffusion resistance and special structure of LFP/C microspheres.