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Berlin 2015 – scientific programme

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MM: Fachverband Metall- und Materialphysik

MM 10: Functional materials II: Battery Materials

MM 10.4: Talk

Monday, March 16, 2015, 12:30–12:45, TC 010

A Mn3O4@MWCNT composite as anode material for Li-ion batteries — •Alexander Ottmann1, Philip Schneider1, Elisa Thauer1, Maik Scholz2, Marcel Haft2, Markus Gellesch2, Franziska Hammerath2, Bernd Büchner2, Silke Hampel2, and Rüdiger Klingeler11Kirchhoff-Institute for Physics, Heidelberg University, Germany — 2Leibniz Institute for Solid State and Materials Research (IFW), Dresden, Germany

Mn3O4 nano-sized particles have been incorporated into the inner hollow cavities of multi-walled carbon nanotubes (MWCNT) via a solution-based approach. The resulting composite material with about 40 wt% of incorporated Mn3O4 has been used for electrochemical half-cell studies against Li0/Li+ by means of cyclic voltammetry and galvanostatic cycling with potential limitation (GCPL). For electrode preparation, no additional carbon black has been used. Cyclic voltammetry shows well-performing working electrodes. The redox peaks during the first half-cycle indicate formation of MnO and subsequently its reversible conversion reaction to metallic Mn. This is confirmed, e.g., by our magnetic studies. In addition, the electrochemical data reveal the formation of a solid electrolyte interface (SEI) and reversible lithium de/-intercalation into the MWCNT. The GCPL data confirm complete conversion of Mn3O4 to MnO during the first half-cycle and full accessibility of the theoretical capacity of the MnO + 2Li+ + 2e <=> Li2O + Mn conversion reaction (703 mAhg−1). The composite material reaches a maximum discharge capacity of 461 mAhg−1 at a current of 100 mAg−1 and maintains 97 % of it in the 30th cycle.

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