Potassium pre-inserted K1.04Mn8O16 as cathode materials for aqueous Li-ion and Na-ion hybrid capacitors

• Published in: Journal of energy chemistry Vol. 46; pp. 53 - 61
• Main Authors: Zhang, Yamin, Chen, Lina, Hao, Chongyang, Zheng, Xiaowen, Guo, Yixuan, Chen, Long, Lai, Kangrong, Zhang, Yinghe, Ci, Lijie
• Format: Journal Article
• Language: English
• Published: Elsevier B.V 01-07-2020
• Subjects: Electrochemical behavior; K1.04Mn8O16; Li-ion hybrid capacitors; Na-ion hybrid capacitors; Pre-inserted; Na-ion hybrid capacitors; Li-ion hybrid capacitors; K1.04Mn8O16; Pre-inserted; Electrochemical behavior
• ISSN: 2095-4956
• DOI: 10.1016/j.jechem.2019.10.015

For the applications of aqueous Li-ion hybrid capacitors and Na-ion hybrid capacitors, potassium ions are pre-inserted into MnO2 tunnel structure, the as-prepared K1.04Mn8O16 materials consist of nanoparticles and nanorods were prepared by facile high-temperature solid-state reaction. The as-prepared materials were well studied and they show outstanding electrochemical behavior. We assembled hybrid supercapacitors with commercial activated carbon (YEC-8A) as anode and K1.04Mn8O16 as cathode. It shows high energy and power densities. Li-ion capacitors reach a high energy density of 127.61 Wh kg−1 at the power density of 99.86 W kg−1 and Na-ion capacitor obtains 170.96 Wh kg−1 at 133.79 W kg−1. In addition, the hybrid supercapacitors demonstrate excellent cycling performance which maintain 97% capacitance retention for Li-ion capacitor and 85% for Na-ion capacitor after 10,000 cycles.
Potassium pre-inserted KxMn8O16 cathode materials consisting nanoparticles and nanorods are obtained by a facile high-temperature calcination method, and excellent electrochemical performance is achieved. [Display omitted]