Synthesis and charac terization of nano powders of Li(۱-y) Co(۰/۳) Ni(۰/۴-x)M n(۰/۳)Zn(x)M g(y)O۲ cathode materials via sol-gel and Freeze drying methods

Synthesis of positive active materials plays a major role in battery perfor mance, especially with respect to capacity an d shelf life. One app roach to improve the electrochemical performance is to dope manganese cobal t nickel oxid es for other metals, which may stabilize the la yered struct ure with or without par ticipating in the redox p rocesses. In this study, nano powde rs of Mg and Zn-dop ed Li(۱-y)C o۰/۳Ni۰/۴-xMn ۰/۳ZnxMgyO ۲(۰/۰۱ x ۰/۰۵ , ۰/۱ y ۰/۳) cathod e materials were synthesized via for lithium bat teries. Nano structure e lectrode materials have a stable cycling behavior during c harge-discha rge processing and also these materials have a better electrochemica l property than micropowders. Zn-doping increase electronic conductivity and improve the high rate discharge capability and therm al stability. Mg stabilizes the la yered structure and enhances the cycling stability. V arious synthesis parameters such as calcinatio ns time, temperature an d acid to me tal ions ratio were studied to determ ine the op timized condition for processing the cathode nano materials. Different techniques such as XRD, S EM were employed to characterize crystal structure, siz e and morph ology and optimal condition of the powder. [۱, ۲]

کلیدواژه ها:

Lithi um-ion battery ، Cathod e materials ، nano powd ers ، Zn and Mg doped ، Sol-Gel ، Freeze dryin g.