Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
7740384 | Journal of Power Sources | 2013 | 7 Pages |
Abstract
The oxygen-stoichiometric spinel Li[Ni0.5Mn1.5]O4 is an insulator with ordered Ni(II) and Mn(IV). Although it delivers 4.7 V versus Li, the ordered phase gives poor performance as the cathode of a Li-ion battery. Here we demonstrate control of the degree of cation order by adjusting the oxygen stoichiometry with thermal history of the synthesis rather than by doping 2M(III) for Ni(II) + Mn(IV) (M = Cr, Mn, Fe, Co, Al, Ga). We report retention of capacity near 100 mAh gâ1 at room temperature at 10C/10C charge/discharge rate with little capacity fade; at 55 °C, a capacity fade occurs as a result of reaction with the electrolyte, but it is reduced to a level comparable to that obtained by doping.
Related Topics
Physical Sciences and Engineering
Chemistry
Electrochemistry
Authors
Guoqiang Liu, Kyu-Sung Park, Jie Song, John B. Goodenough,