| Al掺杂Li-Ni-O系列电池正极材料的制备与性能研究 |
| Synthesis and Property of Al Doping Li-Ni-O Cathode Material for Li-ion Batteries |
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| 摘要: 以Ni(NO3)2、Al(NO3)3和LiOH为原料，研究了一种制备锂离子电池正极材料LiNi1-xAlxO2(x=0.025～0.30)新的共沉淀方法：在前驱体的制备过程中采用超声波振动，在焙烧前用无水乙醇保护前驱体，并在空气气氛下对前驱体进行焙烧。采用充放电测试、XRD和循环伏安研究了掺铝量、焙烧温度和时间、补锂量以及超声波振动对LiNi1-xAlxO2性能及结构的影响。结果表明，在空气气氛中，正极材料LiNi1-xAlxO2中Al的最佳含量为x=0.2，最佳焙烧温度为700 ℃，焙烧时间为16 h,补锂量为0.05(即：nLi∶nNi+Al=1.05∶1)效果较好；并发现掺铝有利于形成和稳定α-NaFeO2型层状有序结构。同时发现，超声波振动提高了电池材料的性能。 |
| 关键词: 锂离子电池 LiNi1-xAlxO2 超声波场 共沉淀法 |
| 基金项目: |
| Abstract: LiNi1-xAlxO2 (x=0.025～0.30) cathode materials were prepared by co-precipitation a mixture of Ni(NO3)2, Al(NO3)3 and LiOH. The ultrasonic vibration was used during the preparation of precursors, and the precursors were protected by the absolute ethyl alcohol before calcination in air. Effects of the quantity of doped-Al, the calcination time and temperature, additional lithium content and the ultrasonic vibration on the structure and property of LiNi1-xAlxO2 were studied by the charge-discharge tests, XRD and cyclic voltammorgram. The result indicates that the optimal content of Al, calcination temperature and time, and additional lithium content for LiNi1-xAlxO2 cathode material are 0.2 (i.e. x=0.2), 700 ℃, 16 h, and 0.05 (i.e. nLi∶nNi+Al=1.05∶1), respectively. Al doping is propitious to form and stabilize the α-NaFeO2 layered structure, and the ultrasonic vibration improves the electrochemical performance of materials. |
| Keywords: Li-ion batteries LiNi1-xAlxO2 ultrasonic field co-precipitation method |
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| 戴长松,羊俊,王殿龙,王福平.Al掺杂Li-Ni-O系列电池正极材料的制备与性能研究[J].无机化学学报,2006,22(11):2011-2017. |
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