Synthesis and electrochemical properties of Li[Ni 0.8Co 0.1Mn 0.1]O 2 and Li[Ni 0.8Co 0.2]O 2 via co-precipitation

• Published in: Journal of power sources Vol. 159; no. 2; pp. 1328 - 1333
• Main Authors: Kim, Myung-Hyoon, Shin, Ho-Suk, Shin, Dongwook, Sun, Yang-Kook
• Format: Journal Article
• Language: English
• Published: Elsevier B.V 22-09-2006
• Subjects: Cathode material; Co-precipitation; Lithium secondary batteries; Thermal stability; Cathode material; Co-precipitation; Lithium secondary batteries; Thermal stability
• ISSN: 0378-7753; 1873-2755
• DOI: 10.1016/j.jpowsour.2005.11.083

Spherical Li[Ni
0.8Co
0.2−
x
Mn
x
]O
2 (
x
=
0, 0.1) with phase-pure and well-ordered layered structure have been synthesized by heat-treatment of spherical [Ni
0.8Co
0.2−
x
Mn
x
](OH)
2 and LiOH·H
2O precursors. The structure, morphology, electrochemical properties, and thermal stability of Li[Ni
0.8Co
0.2−
x
Mn
x
]O
2 (
x
=
0, 0.1) were studied. The average particle size of the powders was about 10–15
μm and the size distribution was narrow due to the homogeneity of the metal hydroxide [Ni
0.8Co
0.2−
x
Mn
x
](OH)
2 (
x
=
0, 0.1). The Li[Ni
0.8Co
0.2−
x
Mn
x
]O
2 (
x
=
0, 0.1) delivered a discharge capacity of 197–202
mAh
g
−1 and showed excellent cycling performance. Compared to Li[Ni
0.8Co
0.2]O
2, Li[Ni
0.8Co
0.1Mn
0.1]O
2 exhibited greater thermal stability resulting from improved structural stability due to Mn substitution.