title: MnCO3 microstructures assembled with nanoparticles: shape-controlled synthesis and their application for Li-ion batteries.
abstract: MnCO3 ellipsoids and twinborn spheres have been synthesized by a hydrothermal process and a room temperature synthesis approach, respectively. The structures and morphologies of the products are investigated by X-ray powder diffraction (XRD) and field emission-scanning electron microscopy (FE-SEM). XRD patterns indicate the MnCO3 ellipsoids display higher crystallinity than twinborn spheres. SEM images show that both the MnCO3 ellipsoids and twinborn spheres have a similar size of about 1 microm and consist of nanoscale primary particles. Brunauer-Emmett-Teller (BET) surface areas of MnCO3 ellipsoids and twinborn spheres are 33.93 and 59.35 m2/g, respectively. Furthermore, the lithium storage properties of these MnCO3 samples with distinct morphologies have been investigated. When used as anode materials in lithium-ion batteries, MnCO3 ellipsoids and twinborn spheres exhibit the initial discharge capacities of 1375 and 1650 mAh/g, respectively. After charged/discharged for 50 cycles at a current density of 500 mA/g, the remaining discharge capacities for MnCO3 ellipsoids and twinborn spheres are 663 and 305 mAh/g, respectively.
authors.affiliation: Hefei National Laboratory for Physical Science at Microscale and Department of Chemistry, University of Science and Technology of China, Hefei, Anhui 230026, PR China.
authors.forename: Yan
authors.initials: Y
authors.lastname: Yan
authors.forename: Yongchun
authors.initials: Y
authors.lastname: Zhu
authors.forename: Yang
authors.initials: Y
authors.lastname: Yu
authors.forename: Jingfa
authors.initials: J
authors.lastname: Li
authors.forename: Tao
authors.initials: T
authors.lastname: Mei
authors.forename: Zhicheng
authors.initials: Z
authors.lastname: Ju
authors.forename: Yitai
authors.initials: Y
authors.lastname: Qian