Enhanced cycle stability of spinel LiMnO by a melting impregnation method

Abstract

Spinel LiMn₂O₄ particles were successfully coated with CuO, MgO, ZnO, Al₂O₃ and CeO₂ by a melting impregnation method. Except for the CeO₂-coated sample, all the others exhibit better cycling stability than bare LiMn₂O₄ at room temperature and at 55°C. Among these samples, the ZnO-coated sample shows the best cycling stability. A capacity of 100 mA·h·g^-1 still remained after 100 cycles at 55°C while the bare LiMn₂O₄ retains a capacity of only 80 mA·h·g^-1 after the same number of cycles. The improvement in the cycling stability is attributed to the suppressed Mn dissolution caused by HF.

Keywords

spinel lithium manganate / melting impregnation / cathode material / lithium-ion batteries