Enhanced electrochemical and storage properties of La sub(2/3)-XLi sub(3)XTiO sub(3)-coated Li[Ni sub(0.4)Co sub(0.3)Mn sub(0.3)]O sub(2)

A Li[Ni sub(0.4)Co sub(0.3)Mn sub(0.3)]O sub(2) cathode was modified by applying a La sub(2/3)-XLi sub(3)XTiO sub(3) (LLT) coating. Transmission electron microscope (TEM) images reveal that the coating layer consists of nanoparticles. The coated cathode demonstrated an enhanced rate capability, disc...

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Bibliographic Details
Published in:Electrochimica acta 2011-08, Vol.56 (20), p.6896-6905
Main Authors: Song, Han Gab, Kim, Je Young, Park, Yong Joon
Format: Article
Language:English
Subjects:
Cathodes
Coating
Discharge
Electrodes
Nanoparticles
Transition metals
Voltage
Online Access:Get full text
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Summary:A Li[Ni sub(0.4)Co sub(0.3)Mn sub(0.3)]O sub(2) cathode was modified by applying a La sub(2/3)-XLi sub(3)XTiO sub(3) (LLT) coating. Transmission electron microscope (TEM) images reveal that the coating layer consists of nanoparticles. The coated cathode demonstrated an enhanced rate capability, discharge capacity, and cyclic performance than the uncoated cathode. However, the influence of the coating upon these electrochemical properties is highly dependent upon the composition of the LLT coating layer. Coating layers having high la and low Li contents, such as La sub(0.67)TiO sub(3), effectively improved the rate capability of the cathode. However, coating layers with a low la and high Li content greatly enhanced the discharge capacity of the cathode under high cut-off voltage (4.8 V) conditions. Overall, the thermal stability of the Li[Ni sub(0.4)Co sub(0.3)Mn sub(0.3)]O sub(2) electrode was improved by the LLT coating. Storage tests confirmed that the La sub(2/3)-XLi sub(3)XTiO sub(3) coating dramatically suppressed the dissolution of transition metals into the electrolyte.
ISSN:0013-4686
DOI:10.1016/j.electacta.2011.06.030