공침법을 이용한 구형 스피넬 Li1.05M0.05Mn1.9O4 (M=Ni, Mg, Al) 합성 및 전기화학적 특성

Abstract

A commercial lithium-ion batteries employ layered LiCoO2 as a cathode material. But it has still some limits such as high cost, environmental problems and limited sources of cobalt ore. Recently, the spinel LiMn2O4 and its derivatives are considered as one of the most attractive cathode materials for lithium secondary batteries because of their low cost, abundance, and non-toxicity. And the spinel cathodes are very attractive for Hybrid Electric Vehicle (HEV) power. But Mn spinel has problem for application. It is the capacity fading on cycling under severe condition (above 40℃). To overcome capacity fading, the manganese site was replaced by some of transition metals to enhance structural stability. In this study, we report the preparation of (M-Mn)3O4 precursor by a hydroxide co-precipitation method. Li1.05M0.05Mn1.9O4 (M = Ni, Mg, Al) powders were characterized by X-ray diffraction, scanning electron microscopy, and electrochemical testing.