【摘要】 采用共沉淀-高温固相法在氧气气氛下合成球形Li Ni0.8Co0.15Al0.05O2正极材料。通过XRD、SEM、恒电流充放电测试和交流阻抗测试等手段分析了氧化铝、氢氧化铝和异丙醇铝三种铝源对合成材料的结构、形貌以及电化学性能的影响。结果表明,以三种不同铝源所合成的正极材料均具有良好的层状结构。用异丙醇铝合成的正极材料具有最小的一次颗粒,球型度较好,具有优异的电化学性能,在0.2 C下首次放电比容量为189.22 m Ah/g,50次循环后容量保持率为84.2%。然后,通过EIS测试分析了不同铝源对合成材料性能影响的原因。更多还原

【Abstract】 The spherical Li Ni0. 8Co0. 15Al0. 05O2 cathode materials were synthesized by co-precipitation and high temperature solid phase calcination reaction in Oxygen atmosphere using different aluminium source including alumina,aluminum hydroxide and aluminum isopropoxide. The crystal structure and morphology of the as-prepared powders were characterized by X-ray diffraction( XRD) and scanning electron microscopy( SEM),respectively. All samples corresponded to the layered α-Na Fe O2 structure with R-3m space group. The Li Ni0. 8Co0. 15Al0. 05O2 prepared using aluminum isopropoxide as aluminium source had the smallest primary particles,the best sphericity and electrochemical performance with an initial discharge capacity of 189. 22 m Ah g-1and a capacity retention of 84. 2%after 50 cycles at 0. 2C. Furthermore,the mechanism was investigated by EIS test.更多还原