Journal
IONICS
Volume 15, Issue 4, Pages 493-496Publisher
SPRINGER HEIDELBERG
DOI: 10.1007/s11581-008-0263-7
Keywords
Li-ion batteries; Cathode materials; LiNi1/3Co1/3Mn1/3O2 ZrO2 coating; Cathodes; Materials preparations; Zirconia
Funding
- Science and Technology Development General Project of Beijing Educational Committee
- Beijing Municipal Higher Education Foundation
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ZrO2-coated LiNi1/3Co1/3Mn1/3O2 materials were prepared by hydroxide precipitation. The structure and electrochemical properties of the ZrO2-coated LiNi1/3Co1/3Mn1/3O2 were investigated using X-ray diffraction, scanning electron microscope, and charge-discharge tests, indicating that the lattice structure of LiNi1/3Co1/3Mn1/3O2 were unchanged after the coating but the cycling stability was improved. As the coating amount increased from 0.0 to 0.5 mol.%, the initial capacity of the coated LiNi1/3Co1/3Mn1/3O2 decreased slightly; however, the cycling stability increased remarkably over the cut-off voltages of 2.5 similar to 4.3 V and the capacity retention reached 99.5% after 30 cycles at the coating amount of 0.5 mol.%. ZrO2 coating also improved the cycling stability of LiNi1/3Co1/3Mn1/3O2 over wider cut-off voltage of 2.5 similar to 4.6 V.
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