Journal
JOURNAL OF POWER SOURCES
Volume 124, Issue 2, Pages 533-537Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/S0378-7753(03)00804-8
Keywords
Li-ion secondary batteries; layered structure; Li(Li,Ni,Mn)O-2; quenching
Ask authors/readers for more resources
A 1: 1 mixture of electrochemically active Li(Ni0.5Mn0.5)O-2 and electrochemically inactive Li(Li1/3Mn2/3)O-2, i.e. Li(Li1/3Mn2/3)O-2, i.e. Li(Li0.17Ni0.25Mn0.58)O-2, has been synthesized by a sol-gel method. The mixture was calcined at 900 degreesC in air for 24 h and cooled at three different rates: quenched into liquid nitrogen, 2 degreesC/min, and 0.5 degreesC/min. It was found that the crystallographic structure and electrochemical properties of Li(Li0.17Ni0.25Mn0.58)O-2 highly depend on the cooling rate. The sample quenched into liquid nitrogen exhibited a long irreversible plateau at ca. 4.5 V during the first charge, and the discharge capacity gradually increased from 170 to 210 mAh/g after 40 cycles. The samples cooled at slower rates exhibited more monoclinic character and cubic spinel phase was observed; they showed no plateaus at 4.5 V during the first charge and the discharge capacities also gradually increased from 80 and 55 mAh/g to 130 and 85 mAh/g for 2 and 0.5 degreesC/min-cooled samples, respectively. (C) 2003 Elsevier B.V. All rights reserved.
Authors
I am an author on this paper
Click your name to claim this paper and add it to your profile.
Reviews
Recommended
No Data Available