Journal
ACS APPLIED MATERIALS & INTERFACES
Volume 8, Issue 50, Pages 34879-34887Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsami.6b11431
Keywords
lithium-ion battery; lithium-nickel-cobalt aluminum oxide; sodium peroxodisulfate; surface oxidation; crystal defect; cation disorder
Funding
- National Science Foundation of China [51577175]
- NSAF [U1630106]
- Hefei Center of Materials Science and Technology [2014FXZY006]
- Education Ministry of Anhui Province [KJ2014ZD36]
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A complete and ordered layered structure on the surface of LiNi0.815Co0.15Al0.035O2 (NCA) has been achieved via a facile surface-oxidation method with Na2S2O8. The field-emission transmission electron microscopy images clearly show that preoxidation of the hydroxide precursor can eliminate the crystal defects and convert Ni(OH)(2) into layered beta-NiOOH, which leads to a highly ordered crystalline NCA, with its (006) planes perpendicular to the surface in the sintering process. X-ray photoelectron spectroscopy and Raman shift results demonstrate that the contents of Ni2+ and Co2+ ions are reduced with preoxidization on the surface of the hydroxide precursor. The level of Li+/Ni2+ disordering in the modified NCA determined by the peak intensity ratio I-(003)/I-(104) in X-ray diffraction patterns decreases. Thanks to the complete and ordered layered structure on the surface of secondary particles, lithium ions can easily intercalate/extract in the discharging-charging process, leading to greatly improved electrochemical properties.
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