(中南大学 冶金科学与工程学院， 长沙 410083)
摘 要: 以化学共沉淀法制备的球形Ni1/3Co1/3Mn1/3CO3为前驱体合成了球形LiNi1/3Co1/3Mn1/3O2, 研究LiNi1/3Co1/3Mn1/3O2合成工艺对产物形貌的影响。结果表明： 直接以前驱体Ni1/3Co1/3Mn1/3CO3与Li2CO3反应合成的LiNi1/3Co1/3Mn1/3O2的一次颗粒较大，以前驱体分解后的氧化物与Li2CO3反应合成的LiNi1/3Co1/3Mn1/3O2的一次颗粒相对细小；合成的LiNi1/3Co1/3Mn1/3O2均为具有层状结构的纯相物质；球形正极材料LiNi1/3Co1/3Mn1/3O2充放电过程中存在一个材料活化的过程，在前10周期充放电时， 电池容量处于增加的状态； 在2.7～4.3 V的电压范围内1 C倍率下电池的放电比容量达到149 mA·h/g， 0.2 C倍率下为158 mA·h/g, 经50次循环后容量无衰减。
关键字: 锂离子电池； LiNi1/3Co1/3Mn1/3O2； 正极材料； 球形
spherical LiNi1/3Co1/3Mn1/3O2
（School of Metallurgical Science and Engineering,
Central South University, Changsha 410083, China）
Abstract: Spherical LiNi1/3Co1/3Mn1/3O2 powders were synthesized from the coprecipitated carbonate precursor, Ni1/3Co1/3Mn1/3CO3. The effect of synthesis conditions on the morphology of LiNi1/3Co1/3Mn1/3O2 materials was studied. The results show that LiNi1/3Co1/3Mn1/3O2 synthesized directly from Ni1/3Co1/3Mn1/3CO3 and Li2CO3 has big primary particle size, while LiNi1/3Co1/3Mn1/3O2 synthesized from the oxide Ni1/3Co1/3Mn1/3CO3 and Li2CO3 is relatively small. All LiNi1/3Co1/3Mn1/3O2 particles are pure phase with layered structure. The spherical cathode material LiNi1/3Co1/3Mn1/3O2 has an activation process and the capacity of LiNi1/3Co1/3Mn1/3O2 increases during the preliminary 10 cycles. The spherical LiNi1/3Co1/3Mn1/3O2 delivers 149 and 158 mA·h/g at the rate of 1 C and 0.2 C and voltage range of 2.7-4.3 V. The material also shows excellent cycling performance that the capacity does not fade after 50 cycles at the rate of 0.2 C.
Key words: Li-ion battery; LiNi1/3Co1/3Mn1/3O2; cathode material; spherical
