title: Do transition metal carbonates have greater lithium storage capability than oxides? A case study of monodisperse CoCO3 and CoO microspindles.
abstract: As substitutions for transition metal oxides (MOs), transition metal carbonates (MCO3) have been attracting more and more attention because of their lithium storage ability in recent years. Is MCO3 better than MOs for lithium storage? To answer this question, monodisperse CoCO3 and CoO microspindles with comparable structures were synthesized and investigated as a case study. Excluding its structural effect, we found CoCO3 still exhibited reversible capacities and rate capabilities much higher than those of CoO. The reversible capacity of CoCO3 after 10 cycles was 1065 mAh g(-1), 48.2% higher than that (∼720 mAh g(-1)) of CoO. Furthermore, the greatly different electrochemical behaviors were investigated by analyzing the discharge-charge profiles, cyclic voltammetry curves, and Nyquist plots in depth. This work can improve our understanding of the lithium storage advantages of MCO3 against MOs and enlighten us in terms of developing high-performance MCO3 with favorable structures.
authors.affiliation: State Key Laboratory Breeding Base of Green Chemistry-Synthesis Technology, College of Chemical Engineering, Zhejiang University of Technology , Hangzhou 310014, China.
authors.forename: Lianbang
authors.initials: L
authors.lastname: Wang
authors.forename: Weijie
authors.initials: W
authors.lastname: Tang
authors.forename: Yu
authors.initials: Y
authors.lastname: Jing
authors.forename: Liwei
authors.initials: L
authors.lastname: Su
authors.forename: Zhen
authors.initials: Z
authors.lastname: Zhou