CAJ | 학술논문

以共沉淀法制备的过渡金属氢氧化物前驱体合成锂离子电池层状正极材料Li[Ni1/3Co1/3Mn1/3]O2.考察氨与过渡金属阳离子的配位效应对Li[Ni1/3Co1/3Mn1/3]O2材料的结构和电化学性能的影响.SEM分析结果表明,当NH3·H2O与过渡金属阳离子的总摩尔比为2.7:1时,获得了分布均一的颗粒为过渡金属氢氧化物共沉淀,合成的Li[Ni1/3Co1/3Mn1/3]O2材料的平均粒径约为500 nm,振实密度接近2.37 g/cm3,接近商品化的LiCoO2正极材料的振实密度.XRD分析结果表明,合成的Li[Ni1/3Co1/3Mn1/3]O2材料具有六角晶格层状结构.Li/Li[Ni1/3Co1/3Mn1/3]O2电池在2.8-4.5 V电压范围内的0.1C倍率测试结果表明,首次放电容量达181.5 mA-h/g,0.5C倍率循环50次后的放电容量为170.6 mA-h/g.
이공침정법제비적과도금속경양화물전구체합성리리자전지층상정겁재료Li[Ni1/3Co1/3Mn1/3]O2.고찰안여과도금속양리자적배위효응대Li[Ni1/3Co1/3Mn1/3]O2재료적결구화전화학성능적영향.SEM분석결과표명,당NH3·H2O여과도금속양리자적총마이비위2.7:1시,획득료분포균일적과립위과도금속경양화물공침정,합성적Li[Ni1/3Co1/3Mn1/3]O2재료적평균립경약위500 nm,진실밀도접근2.37 g/cm3,접근상품화적LiCoO2정겁재료적진실밀도.XRD분석결과표명,합성적Li[Ni1/3Co1/3Mn1/3]O2재료구유륙각정격층상결구.Li/Li[Ni1/3Co1/3Mn1/3]O2전지재2.8-4.5 V전압범위내적0.1C배솔측시결과표명,수차방전용량체181.5 mA-h/g,0.5C배솔순배50차후적방전용량위170.6 mA-h/g.
Layered Li[Ni1/3Co1/3Mn1/3]O2 was synthesized with complex metal hydroxide precursors that were prepared by a co-precipitation method. The influence of coordination between ammonia and transition-metal cations on the structural and electrochemical properties of the Li[Ni1/3Co1/3Mn1/3]O2 materials was studied. It is found that when the molar ratio of ammonia to total transition-metal cations is 2.7:1, uniform particle size distribution of the complex metal hydroxide is observed via scanning electron microscopy. The average particle size of Li[Ni1/3Co1/3Mn1/3]O2 materials was measured to be about 500 nm, and the tap-density was measured to be approximately 2.37 g/cm3, which is comparable with that of commercialized LiCoO2. XRD analysis indicates that the presently synthesized Li[Ni1/3Co1/3Mn1/3]O2 has a hexagonal layered-structure. The initial discharge capacity of the Li[Ni1/3Co1/3Mn1/3]O2 positive-electrode material is determined to be 181.5 mA-h/g using a Li/Li[Ni1/3Co1/3Mn1/3]O2 cell operated at 0.1C in the voltage range of 2.8-4.5 V. The discharge capacity at the 50th cycle at 0.5C is 170.6 mA-h/g.