摘要
采用碳酸盐共沉淀法制备Li[Ni1/3Co1/3Mn1/3]O2。研究了前驱体合成温度、时间和焙烧温度、焙烧时间对材料结构和电化学性能的影响。测试结果表明,合成温度为40℃,时间30 h所得前驱体的振实密度和电化学性能较好。XRD测试结果表明,不同焙烧温度下得到的Li[Ni1/3Co1/3Mn1/3]O2均具有α-NaFeO2型层状结构。其中800℃下焙烧15 h得到的样品具有较好的层状结构和较低的阳离子混排程度。样品在2.8～4.3 V电压范围内,0.2 C放电倍率下的首次放电比容量最高可达159.1 mAh·g-1,循环50次后容量保持率为95.7%。
[ Ni1/3CO1/3Mn1/3 ] O2 powder was prepared by carbonate co-precipitation method. The effects of the synthesis temperature, synthesis time, calcination temperature and calcination time on the morphology, structure and electrochemical properties of the cathode material were investigated in detail. The results indicated that the [Ni1/3 Co1/3 Mn1/3 ] CO3 prepared at 40 ℃ for 30 h had the highest tap density and the best electrochemical performance. X-ray diffraction（XRD） revealed that the Li [ Ni1/3 Co1/3 Mn1/3 ] O2 prepared under different calcination temperature could be indexed by a hexagonal a-NaFeO2 layered structure. The sample prepared at 800 ℃ for 15 h had the best layered structure and low cation mixing. In the voltage range of 2.8-4.3 V, the maximum discharge specific capacity and the minimum capacity loss were obtained for the material synthesized at 800 ℃, which has the initial discharge capacity of 159.1 mAh · g^-1, and the initial capacity of 95.7% was retained after 50 charge-discharge cycling.
出处
《硅酸盐通报》
CAS
CSCD
北大核心
2012年第3期720-725,共6页
Bulletin of the Chinese Ceramic Society
