Poly(benzobisthiazole-dione) Frameworks for Highly Reversible Sodium- and Potassium-Ion Storage
Mochun Zhang, Wei Huang, Qiliang Huang, Xiaohan Yu, Jia‐Ling Wu, Sijia Di, Hualin Ye, Yunling Wu, Yanguang Li
Abstract
The search of electrode materials for highly reversible electrochemical sodium/potassium-ion storage is central to sodium/potassium-ion batteries. Organic electrode materials have recently emerged as potential candidates by virtue of their functional diversity and tunability. Unfortunately, their long-term cyclability remains a challenge because of the structural instability and dissolution issue in common organic electrolytes. Herein, we report a quinone-based polymer [poly(benzobisthiazole-dione), PBTD] as a promising cathode material for sodium/potassium-ion storage. It is prepared from the selective amine–aldehyde condensation reaction and features extended π-conjugation along the molecular chain and diminished solubility in electrolytes. This polymeric electrode material exhibits excellent cycle performances with 93% of the initial capacity retained after 2000 cycles for sodium-ion batteries and a specific capacity of 87 mA h g–1 retained after 1500 cycles for potassium-ion batteries.