Electrochemical performances and mechanisms of MnSn2 as anode material for Li-ion batteries
2013 (English)In: Journal of Power Sources, ISSN 0378-7753, Vol. 244, 246-251 p.Article in journal (Refereed) Published
A synthesis method consisting of a mechanical ball milling activation process followed by a sinteringheating treatment is proposed to obtain MnSn2 as anode material for Li-ion batteries. This two-stepapproach strongly reduces the amount of bSn impurities and provides a better material morphology.This improves the electrochemical performances, even at high C-rate, as shown from the comparisonbetween electrode materials obtained with and without this preliminary activation process. The electrochemicalreactions have been followed at the atomic scale by in situ 119Sn Mössbauer spectroscopy.The first discharge is a restructuring step that transforms the pristine material into Mn/Li7Sn2 nanocompositewhich should be considered as the real starting material for cycling. The delithiation of thisnanocomposite is characterized by two plateaus of potential attributed to the de-alloying of Li7Sn2 followedby the back reaction of Mn with poorly lithiated LixSn alloys, respectively. The composition and thestability of the solid electrolyte interphase were characterized by X-ray photoelectron spectroscopy.
Place, publisher, year, edition, pages
Elsevier, 2013. Vol. 244, 246-251 p.
IdentifiersURN: urn:nbn:se:uu:diva-197842DOI: 10.1016/j.jpowsour.2013.01.110OAI: oai:DiVA.org:uu-197842DiVA: diva2:614498
16th International Meeting on Lithium Batteries (IMLB)