Regensburg 2025 – scientific programme

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CPP: Fachverband Chemische Physik und Polymerphysik

CPP 16: Energy Storage and Batteries I

CPP 16.5: Talk

Tuesday, March 18, 2025, 10:45–11:00, H34

In situ Mechanochemical Synthesis of Organic Anodes in Electrode Processing for Ultra-long Sodium Storage — •Ying Qi, Huaping Zhao, and Yong Lei — TU Ilmenau

Currently, hard carbon is commonly used as an anode material in sodium-ion batteries (SIBs). However, hard carbon anodes face several challenges, including time-consuming and energy-intensive synthesis processes, low-voltage operating platforms, and capacity storage with a steep slope. These issues contribute to severe dendrite growth and reduced full-cell capacity, negatively affecting electrochemical performance. In contrast, organic anodes are becoming a focal point in SIBs research due to their abundant availability, low cost, simple synthesis, and stable potential plateaus. In this study, we directly prepared a series of acid anhydrides including perylene-3,4,9,10-tetracarboxylic dianhydride (PTCDA), 1,4,5,8-naphthalenetetracarboxylic dianhydride (NTCDA), and pyromellitic dianhydride (PMDA) into electrodes using a one-step milling process during slurry preparation. The prepared Na4PTC electrodes show low potential plateaus and ultra-stable cycling performance in SIBs. It exhibited exceptional performance, demonstrating ultra-long cycling stability lasting nearly one year. Additionally, the assembled full cell delivered a high energy density of ~200 Wh kg-1.

Keywords: organic materials; mechanochemistry; semiconductor; Na-ion batteries