聚乙烯吡咯烷酮辅助合成NiCo_(2)O_(4)微球及其电化学性能研究

Polyvinyl Pyrrolidone-Assisted Synthesis of NiCo_(2)O_(4) Microspheres and Their Electrochemical Properties

为了制备比电容高、循环稳定性良好的电极材料,采用以聚乙烯吡咯烷酮(PVP)为表面活性剂辅助共沉淀法制备了尖晶石型NiCo_(2)O_(4)微球,并探究了表面活性剂PVP的添加量、碱源对NiCo_(2)O_(4)电极材料电化学性能的影响。研究结果表明,当PVP添加量为1.5 g、碱源为NaOH时,所制备的NiCo_(2)O_(4)电极材料具有最佳的电容性能;在电流密度为1 A/g时,比电容达到642.8 F/g。同时,经恒电流充放电循环1000次后,比容量保持率为73.6%,显示出较好的循环稳定性。

In order to prepare electrode materials with high specific capacitance and good cycling stability,spinel-type NiCo_(2)O_(4)microspheres were prepared by surfactant-assisted co-precipitation using polyvinylpyrrolidone(PVP)as a surfactant,and the effects of surfactant dosage and alkali source on the electrochemical performances of NiCo_(2)O_(4)materials were explored.The results show that the prepared NiCo_(2)O_(4)electrode material has the best capacitance performance when the dosage of polyvinylpyrrolidone is 1.5 g and the alkali source is NaOH,and the specific capacitance reaches 642.8 F/g at a current density of 1 A/g.Meanwhile,the capacity retention rate of 73.6%is achieved after 1000 cycles of constant-current charging/discharging,showing a good cycling stability.