Spiro-based triphenylamine molecule with steric structure as a cathode material for high-stable all organic lithium dual-ion batteries  

作　　者：Liya Huang Zehao Yu Liubin Wang Bin Qin Fengshi Cai Zhihao Yuan Zhiqiang Luo 

机构地区：[1]Tianjin Key Lab for Photoelectric Materials&Devices,Tianjin Key Laboratory of Organic Solar Cells and Photochemical Conversion,Schoolof Materials Science and Engineering,Tianjin University of Technology,Tianjin 300384,China [2]College of Chemistry&Materials Science,Hebei University,Baoding 071002,Hebei,China [3]Department of Chemistry,The University of Hong Kong,Pokfulam Road,Hong Kong 999077,China [4]Haihe Laboratory of Sustainable Chemical Transformations,Tianjin 300192,China

出　　处：《Journal of Energy Chemistry》2023年第8期24-31,I0003,共9页能源化学（英文版）

基　　金：supported by the National Natural Science Foundation of China (21905205 and 22109037);the Natural Science Foundation of Tianjin City (20JCYBJC00380);the Advanced Talents Incubation Program of Hebei University (521000981408);the Haihe Laboratory of Sustainable Chemical Transformations(YYJC202110)。

摘　　要：Redox p-type organic compounds are promising cathode materials for dual-ion batteries.However,the triphenylamine-based polymers usually with agglomerate and intertwined molecular chain nature limit the maximum reaction of their active sites with large-sized anions.Herein,we demonstrate the application of a small molecule with rigid spirofluorene structu re,namely 2,2’,7,7’-tetrakis(diphenylamine)-9,9’-spirobifluorene(Spiro-TAD),as a cathode material for lithium dual-ion batteries.The inherent sterical structure endows the Spiro-TAD with good chemical stability and large internal space for fast diffusion kinetics of anions in the organic electrolyte.As a result,the Spiro-TAD electrode shows significant insolubility and less steric hindrance,and gives a high actual capacity of 109 mA h g^(-1)(active groups utilization ratio approximately 100%) at 50 mA g^(-1)with a high discharge voltage of 3.6 V(vs.Li+/Li),excellent rate capability(60 mA h g^(-1)at 2000 mA g^(-1)) and extremely stable cycling life(98.4% capacity retention after 1400 cycles at 500 mA g^(-1)) in half cells.Such good electrochemical performance is attributed to the robust and rapid adsorption/desorption of ClO4-anions,which can be proved by the in-situ FTIR and XPS.Moreover,an all-organic lithium dual-ion battery(a-OLDIBs) is constructed using the Spiro-TAD as cathode and 3,4,9,10-Perylenetetracarboxylic diimide(PTCDI) as anode and displays long-term cycling performance of 87.5 mA h g^(-1)after 800 cycles.This study will stimulate further developments in designing all organic battery systems.

关 键 词：Spiro-basedmolecule Cathodematerial P-typeorganiccompounds Longcycling life All organic lithiumdual-ionbatteries 

分 类 号：TM912[电气工程—电力电子与电力传动]