Hybrid Battery-Capacitor System based on LiTi5O12 Anode and PTPAn Cathode

doi:10.13208/j.electrochem.171226

Abstract

Abstract: Owing to its high safe, high rate and long life characteristics, lithium titanate (Li₄Ti₅O₁₂) anode material has attracted extensive attention in recent years, and many efforts are being made to develop the Li₄Ti₅O₁₂ based high performance hybrid supercapacitors and Li-ion batteries. Herein, we prepared the organic cathode material polytriphenylamine (PTPAn) through chemical oxidation and polymerization of triphenylamine (TPAn), and investigated its charge storage mechanism and electrode kinetics withthe typical electrochemical methods in an organic electrolyte. It was demonstrated that the PTPAn exhibited the reversible capacity of 85 mA·g^-1. The charge storage depended on the reversible adsorption/desorption of anion, which is not controlled by the diffusion process, and thus, can be considered as the pseudocapacitive behavior. Then, the PTPAn cathode was coupled with the Li₄Ti₅O₁₂ anode to form a hybrid capacitor/battery system with high power and improved energy density. Finally, the inherent drawback and the challenge for practical application of such an organic cathode are briefly discussed.

Key words: polytriphenylamine, Li₄Ti₅O₁₂, hybrid Supercapacitor, Li-ion battery

CLC Number:

O646

SU Xiu-li, DONG Xiao-li, LIU Yao, WANG Yong-gang, YU Ai-shui. Hybrid Battery-Capacitor System based on LiTi₅O₁₂ Anode and PTPAn Cathode[J]. Journal of Electrochemistry, 2018, 24(4): 324-331.

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Hybrid Battery-Capacitor System based on LiTi₅O₁₂ Anode and PTPAn Cathode

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