Copper doped cobalt-manganese phosphate ternary composites for high-performance supercapattery devices. (March 2021)

• Record Type: Journal Article
• Authors: Iqbal, Muhammad Zahir; Khan, Junaid; Gul, Ayesha; Siddique, Saman; Alzaid, Meshal; Saleem, Murtaza; Iqbal, Muhammad Javaid
• Is Part Of: Journal of energy storage. Volume 35(2021)
• Publication Date: 2021-03
• Subjects: Supercapattery -- Phosphates -- Asymmetric device -- Stability -- Specific energy -- Specific power; Energy storage -- Periodicals; Energy storage -- Research -- Periodicals; 621.3126
• DOI: 10.1016/j.est.2021.102307
• Languages: English
• ISSNs: 2352-152X

Abstract

Highlights: Copper doped cobalt-manganese phosphate is synthesized via sonochemical approach. High specific capacity of 498.2 at 3 mV/s and 483 C/g at 0.5 A/g was obtained in three cell configuration. Supercapattery formed by coupling this electrode material with activated carbon. High power density of 6420 Wkg −1 and high energy density of 56 Whkg −1 . Specific capacity retention of 90.2% after continues 5000 GCD cycles. Abstract: This work demonstrates the electrochemical performance of binary as well as ternary metal phosphates synthesized via a cost-effective and facile sonochemical approach. The structural elemental and morphological study of the as-synthesized was investigated via XRD, EDX and SEM. The electrochemical performance of synthesized material was investigated in three and two cell configuration. An outstanding performance was delivered via copper doped cobalt manganese phosphate (Co0.125 Cu0.375 Mn0.50 (PO4 )2. ) which leads to a specific capacity of 498.2 at 3 mV/s and 483 C/g at 0.5 A/g. This electrode material was utilized as positive electrode material in an asymmetric (supercappatery) device. The activated carbon was employed as a negative electrode material. The fabricated device delivers splendid specific energy of 56 Wh/kg with a specific power of 800 W/kg holds an outstanding specific power of 6420 W/kg while still retaining specific energy of 16.88 Wh/kg. Moreover, the device praises excellent capacity retention of 97.2% after 2000 consective GCD cycles. The supercapattery performance was also analyzed via a simulation approach to investigate the contribution of capacitive and diffusion controlled mechanisms. A maximum capacitive and diffusion contribution of 34.2 (at 60 mV/s) and 86.4% (at 3 mV/s) respectively was observed in aggregate device performance. The morphological and compositional properties along with excellent electrochemical performance make Co0.125 Cu0.375 Mn0.50 (PO4 )2 a valuable electrode material for the development of advanced energy storage devices. Graphical abstract: Image, graphical abstract