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Microstructure and electrochemical performance of LiNi0.6Co0.4−xMnxO2 cathode materials by P.Y. Liao; J.G. Duh; S.R. Sheen is a Engineering article available to read on EtoBox.

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LiNi 0.6 Co 0.4-x Mn x O 2 (0.15 x 0.25) cathode materials for lithium-ion batteries are synthesized by calcining a mixture of Ni 0.6 Co 0.4-x Mn x (OH) 2 and Li 2 CO 3 at 890-950 • C for 15 h in a flowing oxygen atmosphere. The Ni 0.6 Co 0.4-x Mn x (OH) 2 precursor is obtained by a chemical co-precipitation method at pH = 11. Thermal analysis of the precursor for LiNi 0.6 Co 0.4-x Mn x O 2 (0.15 x 0.25) shows that the weight loss is about 30% until the temperature reaches 750 • C. The X-ray diffraction patterns indicate the pure, layered, hexagonal structure of LiNi 0.6 Co 0.4-x Mn x O 2 . Scanning electron micrographs reveal that the morphology of the samples is characterized by larger agglomerates (5-15 m) of rather small layered particles (around 100 nm). The particle size tends to decrease with increasing Mn content. The electrochemical behaviour of LiNi 0.6 Co 0.4-x Mn x O 2 powder is examined by using test cells cycled within the voltage range 3-4.3 V at the 0.1 C rate for the first cycle and then at the 0.2 C rate. LiNi 0.6 Co 0.4-x Mn x O 2 (0.15 x 0.25) cathode materials exhibit good initial discharge capacity (165-180 mAh g -1 ) and a capacity retention of above 95% afte

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Author

P.Y. Liao; J.G. Duh; S.R. Sheen

Publisher

Elsevier Science; Elsevier ; Elsevier BV (ISSN 0378-7753)

Published

2005

Language

EN

Field

Engineering (Physical Sciences)