Affiliation:
1. Institute of Organic Chemistry University of Freiburg Albertstraße 21 79104 Freiburg Germany
2. Freiburg Materials Research Center University of Freiburg Stefan-Meier-Straße 19 79104 Freiburg Germany
3. Nantes Université CNRS Institut des Matériaux de Nantes Jean Rouxel IMN Nantes F-44000 France
4. Current address: Institute of Organic Chemistry II and Advanced Materials Ulm University Albert-Einstein-Allee 11 89081 Ulm Germany
Abstract
AbstractOrganic electrode materials based on conjugated dicarboxylate moieties are particularly attractive to develop metal‐ion organic batteries. Exhibiting good stability properties in liquid electrolytes, such organic electrode materials can reversibly store alkali metal ions (Li, Na or K) at low working potential. Although many molecular designs have been investigated in the last decade, conjugated dicarboxylates are impeded by low coulombic efficiencies, especially at the first cycle, and sluggish kinetics in most cases. Herein, a new strategy in the design of conjugated carboxylates by fusing a thiadiazole heterocycle to the terephthalate core is reported. The synthesis and electrochemical performance of dilithium‐2,1,3‐benzothiadiazole‐4,7‐dicarboxylate (Li2‐DCBTZ) as positive electrode material is investigated for the first time. Next to being a new structural design, the presence of the thiadiazole ring enables (i) a better conjugation of π‐n electrons leading to a benefit in terms of rate capability, and (ii) a better stabilizing coordination network for Li ions through both oxygen and nitrogen atoms. In addition, the reduced state in Li4‐DCBTZ is stabilized due to a maintained aromaticity in the heteroaromatic core in comparison to the parent terephthalate. Theoretical calculations on the Li‐ion storage mechanism and bonding character support the experimental work.
Funder
Deutsche Forschungsgemeinschaft
Subject
General Energy,General Materials Science,General Chemical Engineering,Environmental Chemistry
Cited by
5 articles.
订阅此论文施引文献
订阅此论文施引文献,注册后可以免费订阅5篇论文的施引文献,订阅后可以查看论文全部施引文献