کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
1285652 | 1497928 | 2016 | 4 صفحه PDF | دانلود رایگان |
• O3-Li2/3Ni1/3Mn2/3O2 is synthesized by thermal treatment at 500 °C.
• The initial discharge capacity of Li2/3Ni1/3Mn2/3O2 with thermal treatment at 500 °C is 257 mA h g−1.
• The charge/discharge profiles show a novel high-potential plateau region at 4.8 V.
A lithium nickel manganese oxide, O3-Li2/3Ni1/3Mn2/3O2, is synthesized from the precursor, P3-Na2/3Ni1/3Mn2/3O2, by a Na+/Li+ ion exchange reaction using molten salt. Post-heating at 300, 400, 500, 600, and 700 °C is carried out for 5 h in air. The products are characterized by powder XRD, inductively coupled plasma-atomic emission spectroscopy (ICP-AES), SEM, 6Li-magic-angle-spinning-NMR, and electrochemical measurements. The charge/discharge profiles of O3-Li2/3Ni1/3Mn2/3O2, thermally treated at 500 °C, show a high-potential plateau region at 4.8 V. Furthermore, sloping voltage profiles are observed at an average voltage of 3.21 V. An initial discharge capacity of 257 mA h g−1 is obtained between 2.0 and 4.8 V with a current density of 15 mA g−1 at 25 °C. This capacity corresponds to 0.90 electron transfers per formula unit. This study shows that Post-heating of O3-Li2/3Ni1/3Mn2/3O2 is effective to improve its electrochemical properties.
Journal: Journal of Power Sources - Volume 304, 1 February 2016, Pages 60–63