Affiliation:
1. Key laboratory of Enviromentally Friendly Chemistry and Application of Ministry of Education, College of Chemistry Xiangtan University 411105 Xiangtan China
2. College of Materials Science and Engineering, Hunan Joint International Laboratory of Advanced Materials and Technology of Clean Energy. Hunan University Changsha 410082 China
3. College of Materials Science and Engineering Fuzhou University Fuzhou 350108 China
4. School of Mechanical Engineering Xiangtan University Xiangtan 411105 China
Abstract
AbstractOrganic electrode materials are promising for next‐generation energy storage materials due to their environmental friendliness and sustainable renewability. However, problems such as their high solubility in electrolytes and low intrinsic conductivity have always plagued their further application. Polymerization to form conjugated organic polymers can not only inhibit the dissolution of organic electrodes in the electrolyte, but also enhance the intrinsic conductivity of organic molecules. Herein, we synthesized a new conjugated organic polymer (COPs) COP500‐CuT2TP (poly [5,10,15,20‐tetra(2,2′‐bithiophen‐5‐yl) porphyrinato] copper (II)) by electrochemical polymerization method. Due to the self‐exfoliation behavior, the porphyrin cathode exhibited a reversible discharge capacity of 420 mAh g−1, and a high specific energy of 900 Wh Kg−1 with a first coulombic efficiency of 96 % at 100 mA g−1. Excellent cycling stability up to 8000 cycles without capacity loss was achieved even at a high current density of 5 A g−1. This highly conjugated structure promotes COP500‐CuT2TP combined high energy density, high power density, and good cycling stability, which would open new opportunity for the designable and versatile organic electrodes for electrochemical energy storage.
Funder
National Natural Science Foundation of China
Natural Science Foundation of Hunan Province