Description:
Organic electrode materials have significant advantages over conventional inorganic electrodes for rechargeable battery applications, such as low cost, high theoretical capacity, and environmental friendliness. However, the organic electrode materials generally suffer from slow rate-performance and poor cycling stability. Charge storage performance of the organic electrode materials can be significantly improved through the molecular design on conductive carbon substrates, such as carbon nanotube (CNT) and graphene. For example, we have demonstrated the organic positive electrodes by coating redox-active organic molecules on the surface of CNT and graphene substrates.1-4 This presentation introduces various structure-controlled organic electrodes with significantly enhanced charge storage performance. We establish the structure-property relationship of organic electrode materials by combining computations, structure and electrochemical characterizations. Based on the high-capacity organic positive electrodes, we demonstrate hybrid supercapacitors with significantly enhanced energy and power density. J. C. Bachman, R. Kavian, D. J. Graham, D. Y. Kim, S. Noda, D. G. Nocera, Y. Shao-Horn and S. W. Lee, Nature Communications, 6:7040 (2015). T. Liu, K. C. Kim, B. Lee, Z. Chen, S. Noda, S. S. Jang and S. W. Lee, Energy & Environmental Science, 10, 205 (2017). T. Liu, B. Lee, B. G. Kim, M. J. Lee, J. Park, and S. W. Lee, Small, 14, 1801236 (2018). T. Liu, B. Lee, M. J. Lee, J. Park, Z. Chen, S. Noda, and S. W. Lee, Journal of Materials Chemistry A, 6, 3367 (2018).