Frontier Institute of Science and Technology jointly with College of Science, State Key Laboratory for Strength and Vibration of Mechanical Structures, Xi'an Jiaotong University, Xi'an, Shaanxi, 710054, China.
Department of Nuclear Science and Engineering and Department of Materials Science and Engineering, MIT, Cambridge, MA, 02139, USA.
Angew Chem Int Ed Engl. 2017 Nov 27;56(48):15334-15338. doi: 10.1002/anie.201708960. Epub 2017 Nov 2.
Organic room-temperature sodium-ion battery electrodes with carboxylate and carbonyl groups have been widely studied. Herein, for the first time, we report a family of sodium-ion battery electrodes obtained by replacing stepwise the oxygen atoms with sulfur atoms in the carboxylate groups of sodium terephthalate which improves electron delocalization, electrical conductivity and sodium uptake capacity. The versatile strategy based on molecular engineering greatly enhances the specific capacity of organic electrodes with the same carbon scaffold. By introducing two sulfur atoms to a single carboxylate scaffold, the molecular solid reaches a reversible capacity of 466 mAh g at a current density of 50 mA g . When four sulfur atoms are introduced, the capacity increases to 567 mAh g at a current density of 50 mA g , which is the highest capacity value reported for organic sodium-ion battery anodes until now.
具有羧基和羰基的有机室温钠离子电池电极得到了广泛的研究。在此，我们首次报道了一系列钠离子电池电极，通过逐步用硫原子取代对苯二甲酸钠中羧基中的氧原子，从而改善电子离域、导电性和钠离子吸收能力。基于分子工程的通用策略极大地提高了具有相同碳支架的有机电极的比容量。通过在单个羧酸盐支架中引入两个硫原子，该分子固体在 50 mA g 的电流密度下达到 466 mAh g 的可逆容量。当引入四个硫原子时，在 50 mA g 的电流密度下容量增加到 567 mAh g，这是迄今为止报道的有机钠离子电池阳极的最高容量值。
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