Park Jaehyun, Houser Abigail M, Zhang Shiyu
Department of Chemistry & Biochemistry, The Ohio State University, 100 West 18th Avenue Columbus, Ohio, 43210, USA.
Adv Mater. 2024 Dec;36(49):e2409946. doi: 10.1002/adma.202409946. Epub 2024 Oct 24.
Tetrabutylammonium (TBA) salt of hexacyano-substituted cyclopropane dianion (Cp(CN) ) is prepared through a facile two-step synthetic protocol from commercially available materials and fully characterized as a high-voltage n-type organic cathode in rechargeable aqueous zinc-ion batteries (AZIBs). The addition of tetrabutylammonium triflate (TBAOTf) to the electrolyte mitigates dissolution issues, leading to enhanced cycling stability. Remarkably, the Cp(CN) cathode demonstrates a high discharge voltage of 1.43 V in AZIBs and retains 85% of its capacity after 1000 cycles at a high loading of 10 mg cm and a cycling rate of 10C. These results, combined with spectroscopic analyses, elucidate a reversible two-electron redox process of Cp(CN) facilitated by the insertion/de-insertion of TBA cation. These findings underscore the potential of Cp(CN) as a conversion-based n-type cathode in energy storage applications.
六氰基取代环丙烷二价阴离子（Cp(CN) ）的四丁基铵（TBA）盐通过一种简便的两步合成方法，由市售材料制备而成，并被充分表征为可充电水系锌离子电池（AZIBs）中的一种高压n型有机阴极。向电解质中添加三氟甲磺酸四丁基铵（TBAOTf）可减轻溶解问题，从而提高循环稳定性。值得注意的是，Cp(CN) 阴极在AZIBs中展现出1.43 V的高放电电压，在10 mg cm 的高负载量和10C的循环速率下循环1000次后仍保留其容量的85%。这些结果与光谱分析相结合，阐明了由TBA阳离子的嵌入/脱嵌促进的Cp(CN) 的可逆双电子氧化还原过程。这些发现凸显了Cp(CN) 作为储能应用中基于转换的n型阴极的潜力。
