Sodium-Ion Storage Mechanism in Triquinoxalinylene and a Strategy for Improving Electrode Stability
journal contributionposted on 05.04.2020 by Qinglan Zhao, Wei Zhao, Cheng Zhang, Yilan Wu, Qinghong Yuan, Andrew K. Whittaker, X. S. Zhao
Any type of content formally published in an academic journal, usually following a peer-review process.
Sodium-ion batteries are a promising alternative to lithium-ion batteries. In particular, organic sodium-ion batteries employing environmentally friendly organic materials as electrodes are gaining increasing research interest for developing secondary batteries as a result of the ease of processing, low cost, and flexibility of the organic electrode materials. Triquinoxalinylene (TQA) is a very promising organic electrode material for sodium-ion batteries. However, the poor cycling stability of TQA is impeding its adoption as an electrode material. In this work, we investigated the sodium-ion storage mechanism in TQA and the decay in capacity using both experimental and computational means. A strategy for improving the cycling stability is proposed, and it is demonstrated that the retention of capacity can be significantly improved from 31 to 85%.