title: Cobalt orthosilicate as a new electrode material for secondary lithium-ion batteries.
abstract: Herein, cobalt orthosilicate (Co2SiO4, CSO) is presented as a new electrode material for rechargeable lithium-ion batteries. Orthorhombic α-Co2SiO4 (space group: Pbnm) was synthesized by a conventional solid-state method and subsequently characterized using X-ray diffraction (XRD) and scanning electron microscopy (SEM). To study the reversible lithium uptake and release, cyclic voltammetry (CV), in situ XRD, as well as ex situ X-ray photoelectron spectroscopy (XPS) and SEM analysis were performed. Based on these results a new reaction mechanism is proposed including the reversible formation of lithium silicate. In addition, the electrochemical performance of CSO-based electrodes was investigated by galvanostatic cycling, applying varying specific currents. Such electrodes revealed a good high rate capability and a highly reversible cycling behavior, providing a specific capacity exceeding 650 mAh g(-1) after 60 cycles.
authors.affiliation: Institute of Physical Chemistry & MEET Battery Research Centre, University of Muenster, Corrensstr. 28/30 & 46, 48149 Muenster, Germany. stefano.passerini@kit.edu dominic.bresser@kit.edu.
authors.forename: Franziska
authors.initials: F
authors.lastname: Mueller
authors.forename: Dominic
authors.initials: D
authors.lastname: Bresser
authors.forename: Nathalie
authors.initials: N
authors.lastname: Minderjahn
authors.forename: Julian
authors.initials: J
authors.lastname: Kalhoff
authors.forename: Sebastian
authors.initials: S
authors.lastname: Menne
authors.forename: Steffen
authors.initials: S
authors.lastname: Krueger
authors.forename: Martin
authors.initials: M
authors.lastname: Winter
authors.forename: Stefano
authors.initials: S
authors.lastname: Passerini