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Synthesis and Characterization of Spherical LiNi0.8Co0.1Mn0.1O2 Particles witha High Tap―density

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Author(s): LU Lei, ZHONG Wei-Pan, YANG Hui

Journal: Journal of Inorganic Materials
ISSN 1000-324X

Volume: 27;
Issue: 3;
Start page: 258;
Date: 2012;
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Keywords: spherical particle; coprecipitation; LiNi0.8Co0.1Mn0.1O2; Li-ion batteries

ABSTRACT
Spherical Ni0.8Co0.1Mn0.1(OH)2 precursors with a high tap―density and a narrow size―distribution were synthesized via coprecipitation using NaOH and NH3·H2O as the precipitation and complexing agents. Spherical LiNi0.8Co0.1Mn0.1O2 particles were then prepared by sintering the mixture of this precursor and LiOH·H2O. The prepared materials were characterized by XRD, SEM, TEM, TGA/DSC and galvanostatically charge/discharge tests. The results indicate that secondary spherulites of the precursors are formed by aggregation of crystals but not by elongated crystals. The reaction time shows a significant effect on the morphology, size―distribution and tap―density of the precursor. The LiNi0.8Co0.1Mn0.1O2 powders calcined under 750¡䟦or 16 h exhibit a spherical morphology with the highest tap―density (2.98 g/cm3) and the largest initial discharge capacity (202.4 mAh/g). More than 92.3% of the capacity is retained after 40 cycles. In addition, the cell delivers a discharge capacity of 174.1 mAh/g at 3C rate.
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