Abstract
In this work, Al, Si and Ti oxides are used to modify the surface of LiNi0.6Co0.2Mn0.2O2 (NCM622) electrode through the hydrolysis coating technology. SEM and TEM results revealed that three prepared oxide layers have different uniformity and morphology. Also, charge-discharge results showed different initial discharge capacity and cycle ability of three different oxide coatings. It is shown that when the temperature is increased from 25 to 50 °C, the capacity retention of Al2O3-coated NCM622 is reduced by only 4 %, what demonstrated the best ability of this oxide to restrain cycle deterioration. Additionally, when the charge cutoff voltage is increased to 4.6 V, Al2O3-coated NCM622 showed 74 % of capacity retention. As the number of charge-discharge cycles increases, the dissolution of some transition metal ions may be restrained by Al2O3 layer. Generally, the enhanced electrochemical performance of Al2O3-coated NCM622 could be ascribed to the suppression of mutual reaction between electrode and electrolyte and improvement of structural stability of the material by Al2O3 coating.
Highlights
In recent years, lithium ion batteries with high energy density have attracted much attention in the field of mobile devices such as notebook computers, cellular phones, and digital cameras [1,2,3,4]
For three oxide-coated NCM622 samples, there is no diffraction peaks of Al2O3, SiO2 and TiO2 observed in each X-ray diffraction (XRD) pattern, which may be attributed to low amount of oxide existing on the surface of NCM622.crystal lattice parameters listed in Table 1 were calculated from XRD patterns mentioned above
Oxide coating layers of Al, Si and Ti were successfully prepared on the surface of LiNi0.6Co0.2Mn0.2O2 (NCM622) electrode by the hydrolysis coating technology
Summary
Lithium ion batteries with high energy density have attracted much attention in the field of mobile devices such as notebook computers, cellular phones, and digital cameras [1,2,3,4]. To investigate the influence of oxide coating layer on the electrochemical performance of NCM622 cathode material, three oxide-coated samples and pristine counterpart cells with Li anodes were tested by galvanostatic charging/discharging at 0.1 and 1 C (1 C = 160 mA g-1) in the voltage range of 3.0-4.4 V, at different temperatures (25 and 50 °C).
Sign-in/Register to view highlights & summary Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callMore From: Journal of Electrochemical Science and Engineering
Disclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
