Regensburg 2019 – scientific programme

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MM: Fachverband Metall- und Materialphysik

MM 26: Materials for Energy Storage and Conversion

MM 26.6: Talk

Wednesday, April 3, 2019, 16:15–16:30, H43

poly(10-(4-styrene)-N-10H-phenothiazine) (PS-N-PT) as organic redox-active cathode materials for lithium-ion batteries — •Yuquan Wu¹, Fabian Otteny², Birgit Esser², and Rüdiger Klingeler¹ — ¹Kirchhoff-Institute for Physics, Heidelberg University, 69120 Heidelberg, Germany — ²Institut für Organische Chemie, Albert-Ludwigs-Universität Freiburg, 79104 Freiburg, Germany

Organic redox-active materials provide an environmentally friendly alternative to traditional inorganic electrode materials for lithium ion batteries. Due to structural stability and high-cycling performance, redox-active organic polymers are competitive candidates in this respect. We report electrochemical studies on the redox-active polymer poly(10-(4-styrene)-N-10H-phenothiazine) which is investigated with respect to its feasibility as cathode material. Cyclic voltammetry shows two pairs of redox peaks centered at 3.6 and 4.2 V, respectively, with a separation of 0.05 V. Changes of redox behavior between 1st and 2nd cycle indicate conformational changes on the polymer structure upon the first cycle at high voltage range of 4 - 4.5 V which cause electrochemical activation of the material. Galvanostatic cycling of the activated material between 3 and 4 V shows capacity amounts to 72 mAhg-1 in cycle 2 and capacity retention of 85% by cycle 100.