为提高LiFePO4(LFP)正极材料的电化学性能，采用喷雾干燥结合煅烧工艺合成具有纳微结构和多孔结构的球形LFP/C材料。结果表明，当煅烧温度高于500°C时，粒径尺寸为0.5~5μm的球形前驱体可以完全转化为LFP/C材料。当煅烧温度为700°C时，所得的LFP/C微米球形颗粒是由大量粒径约为20 nm的颗粒及发育良好且相互连通的孔道组成，其比表面积为28.77 m2/g。在0.5C、1C和2C的电流倍率下恒流充放电时，700°C时所得LFP/C材料的放电比容量分别为162.43、154.35和144.03 mA·h/g，且50次循环后的容量保持率达到100%。该材料所具有良好的电化学性能得益于其较小的Li+扩散阻抗和特殊的微观结构。
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 precursorswith the sizesof 0.5?5 μm can be completely converted to LFP/C when the calcination temperature ishigher than 500 °C. The LFP/C microspheres obtained at calcination temperature of700 °C are composed of numerous particleswith sizes of~20 nm, and have well-developed interconnected pore structure and large specific surface area of28.77 m2/g. The specific discharge capacities of the LFP/C obtained at700°Care 162.43,154.35 and 144.03mA·h/g at 0.5C, 1Cand 2C, respectively. Meanwhile, the capacity retentions can reach up to 100% after 50 cycles. The improved electrochemicalpropertiesof the materialsare ascribed toa small Li+diffusion resistance andspecial structure of LFP/C microspheres.
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