摘要
Well-developed crystalline LiNi0.5Mn1.5O4 was prepared by solid-state reaction using Li2CO3, NiO and electrolytic MnO2 at high heating and cooling rate. X-ray diffraction (XRD) patterns and scanning electron microscopic (SEM) images showed that LiNi0.5Mn1.5O4 synthesized at 900 ℃ and 950 ℃ had cubic spinel structure with clearly defined shape. LiNi0.5Mn1.5O4 spinel phase decomposed at 1 000 ℃ accompanying with structural and morphological degradation. TG measurement revealed that the weight loss during heating process could be mostly gained in cooling process, and the upward tendency of weight loss during heating process decreased, while that of irreversible weight loss rapidly increased with the increase of temperature. LiNi0.5Mn1.5O4 powders prepared at 900 ℃ for 12 h delivered the maximum discharge capacity of 134 mAh·g-1 with good cyclic performance at 2/7 C. In addition, by adjusting the calcination time at 900 ℃, the capacity and cycling performance of LiNi0.5Mn1.5O4 were further enhanced.
Well-developed crystalline LiNi0.5Mn1.504 was prepared by solid-state reaction using Li2CO3, NiO and electrolytic MnO2 at high heating and cooling rate. X-ray diffraction （XRD） patterns and scanning electron microscopic （SEM） images showed that LiNi0.5Mn1.5O4 synthesized at 900 ℃ and 950 ℃ had cubic spinel structure with clearly defined shape. LiNi0.5Mn1.5O4 spinel phase decomposed at 1 000 ℃ accompanying with structural and morphological degradation. TG measurement revealed that the weight loss during heating process could be mostly gained in cooling process, and the upward tendency of weight loss during heating process decreased, while that of irreversible weight loss rapidly increased with the increase of temperature. LiNi0.5Mn1.5O4 powders prepared at 900 ℃ for 12 h delivered the maximum discharge capacity of 134 mAh·g^-1 with good cyclic performance at 2/7 C. In addition, by adjusting the calcination time at 900 ℃, the capacity and cycling performance of LiNi0.5Mn1.5O4 were further enhanced.
出处
《无机化学学报》
SCIE
CAS
CSCD
北大核心
2006年第2期311-315,共5页
Chinese Journal of Inorganic Chemistry
基金
教育部留学回国人员科研启动基金资助项目
