[Nature Energy] Prof. Yong Yang published a cooperative paper entitled “Reversible multi-electron redox chemistry of π-conjugated N-containing heteroaromatic molecule-based organic cathodes”

Publish Date:2017-5-22     Visited571Times    bsp;  
Title: Reversible multi-electron redox chemistry of π-conjugated N-containing heteroaromatic molecule-based organic cathodes

Author: Chengxin Peng, Guo-Hong Ning, Jie Su, Guiming Zhong, Wei Tang, Bingbing Tian, Chenliang Su, Dingyi Yu, Lianhai Zu, Jinhu Yang, Man-Fai Ng, Yong-Sheng Hu, Yong Yang*, Michel Armand & Kian Ping Loh*

Abstract:
Even though organic molecules with well-designed functional groups can be programmed to have high electron density per unit mass, their poor electrical conductivity and low cycle stability limit their applications in batteries. Here we report a facile synthesis of π-conjugated quinoxaline-based heteroaromatic molecules (3Q) by condensation of cyclic carbonyl molecules with o-phenylenediamine. 3Q features a number of electron-deficient pyrazine sites, where multiple redox reactions take place. When hybridized with graphene and coupled with an ether-based electrolyte, an organic cathode based on 3Q molecules displays a discharge capacity of 395 mAh g−1at 400 mA g−1 (1C) in the voltage range of 1.2–3.9 V and a nearly 70% capacity retention after 10,000 cycles at 8 A g−1. It also exhibits a capacity of 222 mAh g−1 at 20C, which corresponds to 60% of the initial specific capacity. Our results offer evidence that heteroaromatic molecules with multiple redox sites are promising in developing high-energy-density, long-cycle-life organic rechargeable batteries.

                   
                

Full Link: https://www.nature.com/articles/nenergy201774