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Electrochemical characterization of high performance Al2O3 (MEA) coated LiNiVO4 cathode materials for secondary lithium batteries by George Ting-Kuo Fey; P. Muralidharan; Cheng-Zhang Lu; Yung-Da Cho is a Materials Science article available to read on EtoBox.

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Inverse spinel structured LiNiVO 4 has been prepared by a citric acid polymeric process in addition with urea. Al 2 O 3 derived from (methoxyethoxy) acetate-alumoxane (MEA) has been used to coat the LiNiVO 4 cathode and it has established sustainable extended cycle stability. The (MEA)-alumoxane was prepared by reacting pseudo-boehmite with (methoxyethoxy) acetic acid. XRD patterns showed that the formation of a crystalline phase occurred at 723 and 873K and for the coated material with no indication of new peaks. TEM micrographs of the pristine LiNiVO 4 and coated powder revealed that particle size ranged from 50 to 70 nm and the coating was compact with an average thickness of about 15 nm. ESCA depth profiles of the constituent elements in the coated particle confirmed a layer of Al 2 O 3 formed on the surface of the LiNiVO 4 . The galvanostatic cycling studies suggest that 0.5 wt.% coating resultant from a (methoxyethoxy) acetate-alumoxane enhanced the cycle stability two times compared with the pristine LiNiVO 4 . The improved performance is attributed to the ability of the Al 2 O 3 resultant (MEA) precursor layer on the core material to suppress the side reaction and dissoluti

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Author

George Ting-Kuo Fey; P. Muralidharan; Cheng-Zhang Lu; Yung-Da Cho

Publisher

Elsevier Science; Elsevier ; Elsevier BV (ISSN 0167-2738)

Published

2006

Language

EN

Field

Materials Science (Physical Sciences)