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CPP: Fachverband Chemische Physik und Polymerphysik

CPP 19: Energy Storage and Batteries II

CPP 19.3: Talk

Tuesday, March 19, 2024, 10:00–10:15, H 0111

Maximizing utilization of n-type redox sites in polyaniline copolymer for stable non-aqueous sodium/potassium-ion batteries — •Chengzhan Yan, Huaping Zhao, and Yong Lei — Fachgebiet Angewandte Nanophysik, Institut für Physik & IMN MacroNano, Technische Universität Ilmenau, 98693 Ilmenau, Germany.

Polyaniline (PANI) plays a multifaceted role in energy storage because of its tunable composition, structure and morphology. In non-aqueous sodium/potassium-ion batteries, PANI is a prime organic cathode with p-type anion storage. However, its specific capacity is limited owing to the partial utilization of the chain and is of ease decay in changeable electrochemical environments. Moreover, n-type redox sites that co-exist with the p-type sites have not received much attention because they are difficult to introduce by in situ chemical oxidation. To this end, the elucidation of n-type reaction in PANI chain and its practice are urgently needed. Herein, a series of carboxylated polyaniline copolymers (named PA2A) are synthesized with a high proportion of quinoid nitrogen. PA2A delivers a high specific capacity of more than 300 mAh/g at a low current density. To further improve the rate performance, PA2A is post-treated by ammonia to achieve a self-doped chain structure (named PA2A-de). This structure greatly accelerates the n-type reaction kinetics, and a low-carboxylated PA2A-de has a high capacity retention of over 70% as the current density increases 20 times from 0.1 A/g to 2 A/g. Besides, the long lifespan of PA2A-de is proven to be sustained in ether-based electrolytes.

Keywords: polyaniline; copolymer; n-type redox; non-aqueous; batteries