3)O_2正极材料的制备及其表征被引量：9

Preparation and characterization of LiNi_(1/3)Co_(1/3)Mn_(1/3)O_2 cathode material

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摘要利用机械球磨对前驱体进行活化处理,在940℃于空气气氛中烧结12h制备层状结构LiNi1/3Co1/3Mn1/3O2正极材料。通过XRD,SEM和电化学性能测试对所制备材料的结构、形貌及电化学性能进行表征。结果表明,所合成的材料为单相的六方层状结构;产物一次粒子粒径均匀,为1～2μm,二次团聚颗粒平均粒径为10μm左右;在2.75～4.3V电压区间,所制备的LiNi1/3Co1/3Mn1/3O2以0.2C(C为充放电倍率)进行恒电流充放电,首次放电容量达146.3mA·h·g-1;在倍率为0.4C,0.8C,1.6C和2.0C时的放电容量分别为135.2,130.1,125.8和114.7mA·h·g-1,倍率放电性能优良;在倍率为0.2C时经过30次循环,材料放电容量和容量保持率分别为143.3mA·h·g-1和98%,循环稳定性好。 Layered structure of LiNi1/3Co1/3Mn1/3O2 cathode material was prepared by a solid state method with the precursor activated by ball milling. XRD, SEM and electrochemical tests were used to characterize the structure, micro-morphology and electrochemical properties of the as-preparod materials. The results show that pure phase LiNi1/3Co1/3Mn1/3O2 with hexagonal structure is obtained at 940 ℃ for 12 h in air. The average secondary particle size is about 10 grn with uniform primary particles of 1-2 μm in diameter. The as-prepared LiNi1/3Co1/3Mn1/3O2 delivers initial discharge capacity of 146.3 mA·h·g^-l at 0.2C rate in the voltage of 2.75-4.3 V, and the discharge capacities at 0.4C, 0.8C, 1.6C and 2.0C are 135.2, 130.1,125.8 and 114.7 mA·h·g^-l, respectively, indicating good rate capability. After 30 cycles at 0.2C, the discharge capacity and capacity retention ratio are 143.3 mA·h·g^-1 and 98%, respectively, indicating good cycling stability.

作者苏继桃苏玉长赖智广方惠会

机构地区中南大学材料科学与工程学院

出处《中南大学学报（自然科学版）》 EI CAS CSCD 北大核心 2008年第2期221-227,共7页 Journal of Central South University:Science and Technology

基金教育部高等学校骨干教师基金资助项目(2000年)

关键词锂离子电池固相法 LINI1/3CO1/3MN1/3O2 Li-ion battery solid state method LiNi1/3Co1/3Mn1/3O2

分类号 TM912.9 [电气工程—电力电子与电力传动]

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