Factors Influencing the Capacity Fade of Spinel Lithium Manganese Oxides

作者：Youngjoon Shin, Arumugam Manthiram · 发表于：Journal of The Electrochemical Society · 年份：2004 · DOI：10.1149/1.1634274 · 被引用次数：142 · 研究领域：Advancements in Battery Materials、Advanced Battery Materials and Technologies、Supercapacitor Materials and Fabrication

With the aim of developing a better understanding of the capacity fading mechanisms of spinel manganese oxides, the percent capacity fade of a number of singly substituted Al, Ti, Co, Ni, and Cu and and doubly substituted Ti, Fe, Co, Ni, Cu, and Ga, and oxides is correlated to the initial lattice parameter, initial manganese valence, degree of manganese dissolution, electrode resistance, irreversible capacity (IRC) loss in the first cycle, and lattice parameter difference between the two cubic phases formed in the two-phase region during the charge-discharge process. The doubly substituted samples exhibit a combination of superior capacity retention and rate capability with lower IRC compared to despite a similar amount of manganese dissolution due to a low and the consequent low microstrain. The samples with a low are also characterized by a lower initial lattice parameter and a higher initial Mn valence of >3.58+ for the as-prepared samples. The percent capacity fade, IRC, and all exhibit a sharp decrease as the initial Mn valence in the as-prepared sample exceeds 3.58+. © 2004 The Electrochemical Society. All rights reserved.