Year: 2004
Type: article
Abstract: 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.
DOI: 10.1149/1.1634274
Authors: Youngjoon Shin, Arumugam Manthiram
Institution: The University of Texas at Austin
Language: English
Subfield: Electrical and Electronic Engineering
Field: Engineering
Domain: Physical Sciences
Open Access status: bronze
OpenAlex ID: W2155343711