Bipyridine carboxylic acid as a high-performance anode material for lithium- and sodium-ion batteries. (10th February 2022)

• Record Type: Journal Article
• Authors: Bo, Yiyang; Wu, Wanbao; Guo, Ruitian; Cao, Miaomiao; Liang, Yihong; Wang, Mi; Yu, Wen; Zhang, Ling; Zhang, Jiaheng
• Is Part Of: Electrochimica acta. Volume 405(2022)
• Publication Date: 2022-02-10
• Subjects: Lithium-ion batteries -- Sodium ion batteries -- Organic anode materials -- Heterocyclic carboxylic acid -- 2, 2′-bipyridine-5, 5′-dicarboxylic acid; Electrochemistry -- Periodicals; Electrochemistry, Industrial -- Periodicals; 541.37
• DOI: 10.1016/j.electacta.2021.139628
• Languages: English
• ISSNs: 0013-4686

Abstract

Abstract: Commercial lithium-ion batteries with carbon-based anodes exhibit low specific capacities and pose potential safety risks of lithium plating. As possible alternatives, conjugated carboxylic acid-based electrode materials have attracted extensive attention owing to their suitable discharge potential, low solubility in electrolytes, and low-cost reproducibility. However, their theoretical capacities are limited by the number of active sites. In this paper, we introduce 2, 2′-bipyridine-5, 5′-dicarboxylic acid (H2 bpy) as a new anode material demonstrating high specific capacity, good cycle stability, and remarkable rate performance in both lithium- and sodium-ion batteries. In particular, H2 bpy possesses an ultrahigh initial capacity of lithium-ion battery of 1200 mAh g −1 at a current density of 200 mAg −1, and the specific capacity can maintain 550 mAhg −1 after 100 cycles. Whereas the sodium-ion battery retains a specific capacity of 258 mAhg −1 under the same conditions. We find, through density functional theory analysis, that the superior performance is due to the molecular structure and stacking form of H2 bpy. Furthermore, we perform an ex situ spectroscopic analysis and find that the H2 bpy electrode has good electrochemical stability. These findings suggest that bipyridine carboxylic acids can effectively broaden the application of heterocyclic carboxylic acids as anode materials.