High Rate and Long Lifespan Sodium-Organic Batteries Using Pseudocapacitive Porphyrin Complexes-Based Cathode

Nano-Micro Letters

Zhi Chen¹  Xiukang Yang²  Xin Feng²  Liangzhu Jiang²  Ping Gao²  Xiujuan Sun²  Enhui Liu²  Bo Ren²  Xi Chen²  Hongbo Shu² 

[1] International Collaborative Laboratory of 2D Materials for Optoelectronics Science and Technology of Ministry of Education, Institute of Microscale Optoelectronics, College of Chemistry and Enviromental Engineering, Shenzhen University, 518060, Shenzhen, People’s Republic of China;Key Laboratory of Environmentally Friendly Chemistry and Application of Ministry of Education, Key Laboratory for Green Organic Synthesis and Application of Hunan Province, College of Chemistry, Xiangtan University, 411105, Xiangtan, People’s Republic of China;

关键词: Organic cathode;    Sodium-organic batteries;    Porphyrin complex;    Rechargeable batteries;    Pseudocapacitive effect;   

DOI  :  10.1007/s40820-021-00593-8

来源: Springer

【 摘 要 】

tsFunctionalized porphyrin complexes are proposed as new pseudocapacitive cathodes for SIBs based on four-electron transfer.The presence of copper(II) ion partially contributes the charge storage and significantly stabilizes the structure of porphyrin complex for electrochemical energy storage.The electrochemical polymerization of porphyrin complex through the ethynyl groups in self-stabilization process contributes to high rate capability and excellent cycling stability.AbstractSodium-organic batteries utilizing natural abundance of sodium element and renewable active materials gain great attentions for grid-scale applications. However, the development is still limited by lack of suitable organic cathode materials with high electronic conductivity that can be operated stably in liquid electrolyte. Herein, we present 5,15-bis(ethynyl)-10,20-diphenylporphyrin (DEPP) and [5,15-bis(ethynyl)-10,20-diphenylporphinato]copper(II) (CuDEPP) as new cathodes for extremely stable sodium-organic batteries. The copper(II) ion partially contributes the charge storage and significantly stabilizes the structure of porphyrin complex for electrochemical energy storage. In situ electrochemical stabilization of organic cathode with a lower charging current density was identified which enables both improved high energy density and power density. An excellent long-term cycling stability up to 600 cycles and an extremely high power density of 28 kW kg−1 were achieved for porphyrin-based cathode. This observation would open new pathway for developing highly stable sodium-organic cathode for electrochemical energy storage.

【 授权许可】

CC BY