【摘要】 以Ni(OH)2、Al(OH)3和LiOH·H2O为原料,采用高温固相反应法,在空气中合成了锂离子电池正极材料LiNi1-xAlxO2(x=0 025～0 30)。用XRD和充放电试验研究了合成材料的物相、结构和电化学性能;研究了合成温度、合成时间、补锂量对合成产物结构的影响以及掺铝量对合成产物结构和充放电容量的影响。实验结果表明:掺铝有利于形成和稳定α NaFeO2型层状有序结构。掺铝量对材料的结构和充放电容量均有重要影响,掺铝量为5%的样品,首次放电比容量最高,达到141 5mAh/g。在空气中合成LiNi1-xAlxO2(x=0 025～0 30)的最佳温度为750℃,合成时间以18～24h为宜,补锂量为10%效果较好。更多还原

【Abstract】 LiNi_{1- x} Al x O₂（ x =0.025～0.30）were synthesized in air by high temperature solid reaction using Ni（OH）₂, （Al（OH）₃） and LiOH·H₂O as starting materials.The crystal structure and electrochemical performance were characterized by XRD and charge-discharge test. The effects of synthesis temperature, time,lithium and aluminum contents on the crystal structure charge-discharge capacity were investigated.Results showed that the substitution of aluminum for nickel in LiNiO₂ was good for the formation and stabilization of layered α-NaFeO₂ structure. Aluminum content had important effects on the crystal structure and charge-discharge capacity. In all the samples, the one with 5% aluminum had the highest capacity, with the initial discharge capacity of 141.5?mAh/g. The optimized conditions for synthesis of LiNi_{1- x} Al x O₂（ x =0.025～0.30） in air were to calcine at 750?℃ for 18～24?h with 10% lithium excess.更多还原