Volume 5, Issue 8 e202200178
Research Article

Quadruply Fused Aromatic Heterocycles toward 4 V-Class Robust Organic Cathode-Active Materials

Dr. Kan Hatakeyama-Sato

Corresponding Author

Dr. Kan Hatakeyama-Sato

Department of Applied Chemistry, Waseda University, Tokyo, 169-8555 Japan

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Choitsu Go

Choitsu Go

Department of Applied Chemistry, Waseda University, Tokyo, 169-8555 Japan

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Tomoki Akahane

Tomoki Akahane

Department of Applied Chemistry, Waseda University, Tokyo, 169-8555 Japan

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Dr. Takahiro Kaseyama

Dr. Takahiro Kaseyama

Materials Research Laboratories, Frontier Material Research Department, Nissan Chemical Corporation, Chiba, 274-0052 Japan

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Dr. Takuji Yoshimoto

Dr. Takuji Yoshimoto

Materials Research Laboratories, Frontier Material Research Department, Nissan Chemical Corporation, Chiba, 274-0052 Japan

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Prof. Kenichi Oyaizu

Corresponding Author

Prof. Kenichi Oyaizu

Department of Applied Chemistry, Waseda University, Tokyo, 169-8555 Japan

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First published: 27 April 2022
Citations: 2

Graphical Abstract

High voltage: A dimethylfluoflavin-substituted polymer displays reversible charge/discharge at high potentials of 4.1 and 3.5 V (vs. Li/Li+) as organic cathode-active material. A long cycle-life (>1000) is achieved regardless of the high potentials. The successful polymer design and robust redox units in the charged states are keys to realizing high voltage and electrochemical stability.

Abstract

Quadruply fused aromatic heterocycles are examined as 4 V-class organic cathode-active materials. A newly synthesized dimethylfluoflavin-substituted polymer displays reversible charge/discharge at high potentials of 3.5 and 4.1 V (vs. Li/Li+) as a cathode-active material for organic secondary batteries. The robust redox-active heterocycles enable the long cycle-life (>1000) while maintaining the high potential over 4 V. The linear polymer backbone and radical spin configuration in the heterocycles are the keys to enhancing the voltages and the cycle life.

Conflict of interest

The authors declare no conflict of interest.

Data Availability Statement

The data that support the findings of this study are available from the corresponding author upon reasonable request.