Extended π-conjugated N-containing heteroaromatic hexacarboxylate organic anode for high performance rechargeable batteries  

作　　者：Shu-Biao Xia Teng Liu Wen-Jin Huang Hong-Bo Suo Fei-Xiang Cheng Hong Guo Jian-Jun Liu 

机构地区：[1]Center for Yunnan-Guizhou Plateau Chemical Functional Materials and Pollution Control,Qujing Normal University,Qujing 655011,Yunnan,China [2]School of Pharmacy,Liaocheng University,Liaocheng 252059,Shandong,China [3]School of Materials Science and Engineering,Yunnan University,Kunming 650091,Yunnan,China

出　　处：《Journal of Energy Chemistry》2020年第12期303-311,共9页能源化学（英文版）

基　　金：financial support from the National Natural Science Foundation of China (51764048, 21961030 and 51474191);Yunnan Province Thousand Youth Talents Plan;the Application Basis Research Project of Yunnan Province Science and Technology Department (2017FD144);the Key Natural Science Foundation of Yunnan Province China (2018FA28, 2019FY003023 and 2018FH001-007)。

摘　　要：Organic electrode materials are desirable for green and sustainable Li-ion batteries(LIBs) due to their light-weight, low cost, abundance and multi-electron transfer reactions during battery operation. However, the successful utilization of organic electrodes is hindered by their poor electrical conductivity and low cyclic stability. Herein, a facile synthesis of π-conjugated N-containing heteroaromatic hexacarboxylate(Li6-HAT) compound and its electrochemical performance as an anode material in LIBs is reported.The as-synthesized Li6-HAT electrode renders an ultrahigh initial capacity of 1126.3 m Ah g^(-1) at the current density of 100 m A g^(-1). Moreover, π-conjugated N-containing heteroaromatic center provide excellent reversibility of(de)lithiation process, resulting in excellent capacity retention. Furthermore, a combination of density functional theory(DFT) calculations, in-situ Fourier transform infrared(FTIR) and ex-situ X-ray photoelectron spectroscopy(XPS) characterization reveal that the π-conjugated nitrogen and carboxyl oxygen act as electrochemically active sites during the charge/discharge process. The current work provides novel insights into the charge storage mechanism of organic electrodes and opens up avenues for further development and utilization of organic electrodes in Li-ion batteries.

关 键 词：Li-ion batteries Hexacarboxylate π-conjugated compounds N-containing Organic anode 

分 类 号：TB34[一般工业技术—材料科学与工程] TM912[电气工程—电力电子与电力传动]