A carboxylate- and pyridine-based organic anode material for K-ion batteries
A carboxylate- and pyridine-based organic anode material for K-ion batteries
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用于钾离子电池的基于羧酸盐和吡啶的有机负极材料
DOI：
10.1039/d2nj03447f
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发表时间：
2022
影响因子：
3.3
通讯作者：
Luo, Chao
中科院分区：
文献类型：
--
作者：
Holguin, Kathryn;Qin, Kaiqiang;Huang, Jinghao;Luo, Chao
由于缺乏高性能和环境友好的电极材料，开发高容量、稳定和可持续的钾离子电池（KIB）是一个持续的挑战。为了应对这一挑战，价格实惠、丰富、高度可持续、高度可调和灵活的有机电极材料提供了机会。在此，我们报道了一种新型含氮羧酸盐 K2C12H6N2O4 (K-DCA)，具有两个联吡啶部分和两个羧酸根基团。 K-DCA 中的基于羧酸盐和吡啶的活性中心可以与四个 K 离子发生可逆反应，提供 163.3 mA h g−1 的比容量，并具有一对以~0.8 V 为中心的氧化还原平台。当与氮掺杂还原氧化石墨烯 (NrGO) 耦合时，复合阳极材料 K-DCA-NrGO 表现出 225.25 mA h g−1 的高比容量，并且在放电过程中容量保持率有所提高。长期骑自行车。此外，反应动力学和机理研究表明，该复合材料在循环时表现出低过电位、低相间电阻、部分赝电容行为和稳定的化学/形态结构，这有助于快速动力学和长循环寿命。
Developing high-capacity, stable, and sustainable K-ion batteries (KIBs) is an ongoing challenge due to the lack of high-performance and environmentally benign electrode materials. To address this challenge, organic electrode materials that are affordable, abundant, highly sustainable, highly tunable and flexible offer opportunities. Herein, we report a novel N-containing carboxylate salt, K2C12H6N2O4 (K-DCA), with two bipyridine moieties and two carboxylate groups. The carboxylate- and pyridine-based active centers in K-DCA can reversibly react with four K-ions to provide a specific capacity of 163.3 mA h g−1 with a pair of redox plateaus centered at ∼0.8 V. When coupling with nitrogen-doped reduced graphene oxide (NrGO), the composite anode material, K-DCA-NrGO, demonstrates a high specific capacity of 225.25 mA h g−1 and increased capacity retention during long-term cycling. Additionally, the reaction kinetics and mechanism studies demonstrate that the composite exhibits low overpotentials, low interphase resistance, a partial pseudo-capacitance behavior, and stable chemical/morphological structures upon cycling, which contribute to the fast kinetics and long cycle life.