Harnessing benzimidazole moiety and annealing in ruthenium tetra-substituted benzimidazole phthalocyanine/carbon nanotube composite for enhanced Li-ion battery anodes

초록

We present a novel ruthenium tetra-substituted benzimidazole phthalocyanine (RuTBzPc)-based anode for the Li-ion batteries (LIBs). To address common issues such as side reactions, volume changes, and poor cycling performance, we introduced a benzimidazole moiety, thermal annealing, and single-walled carbon nanotubes (SWCNTs) into the preparation of RuTBzPc. Introducing the benzimidazole moiety during the synthesis facilitated electrochemical interactions, resulting in superior Li-ion diffusion kinetics, and suppressed capacity fading during cycling. Annealing removed impurities and increased the conductivity of RuTBzPc materials, leading to improved crystallinity and charge-transport properties. Incorporating SWCNTs increased the surface area and number of Li-ions inserted into the electrode surface. Electrochemical characterization of the RuTBzPc (annealed)/SWCNT electrode showed significantly improved specific capacity, rate capacity, and cycling stability, highlighting the promising potential of these innovative methodologies in improving LIB performance. In addition, the electrode exhibits a remarkably long cycling life, superior capacity (1185 mAh g−1 at 0.1 A g−1 over 100 cycles), and good rate performance. This study emphasizes the importance of exploring novel synthesis and processing strategies to optimize the anode materials for LIBs. © 2025 Elsevier B.V.

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