title: Nanostructured porous manganese carbonate spheres with capacitive effects on the high lithium storage capability.
abstract: In this paper, nanostructured porous MnCO3 spheres are facilely synthesized, which can simultaneously provide an increased surface for conversion reaction and capacitive storage as the anode material for lithium ion batteries. This material gives a superior specific capacity and excellent long-term cycling performance even at a high current density. It can deliver a stable capacity of 1049 mA h g(-1) after 200 cycles at a current density of 1000 mA g(-1), which is much higher than the theoretical capacity of 466 mA h g(-1). After 2000 cycles at a high current density of 5000 mA g(-1), a capacity of 510 mA h g(-1) can still be maintained. Their high rating performance at 5000 mA g(-1) is among the best-reported performances of anode materials. From the in situ or ex situ SEM observation, the porous MnCO3 nanostructure can provide a stable template for reversible lithium insertion and extraction without significant morphology change and accommodate the volume change during the charge-discharge process. Also this structure increases the capacitive contribution to the total capacity compared with other MnCO3 samples.
authors.affiliation: Center of Super-Diamond and Advanced Films (COSDAF), City University of Hong Kong, Hong Kong SAR, People's Republic of China. apcslee@cityu.edu.hk.
authors.forename: Wenpei
authors.initials: W
authors.lastname: Kang
authors.forename: Denis Yau Wai
authors.initials: DY
authors.lastname: Yu
authors.forename: Wenyue
authors.initials: W
authors.lastname: Li
authors.forename: Zhenyu
authors.initials: Z
authors.lastname: Zhang
authors.forename: Xia
authors.initials: X
authors.lastname: Yang
authors.forename: Tsz-Wai
authors.initials: TW
authors.lastname: Ng
authors.forename: Rujia
authors.initials: R
authors.lastname: Zou
authors.forename: Yongbing
authors.initials: Y
authors.lastname: Tang
authors.forename: Wenjun
authors.initials: W
authors.lastname: Zhang
authors.forename: Chun-Sing
authors.initials: CS
authors.lastname: Lee