TY - JOUR
T1 - High-Power and Long-Life Na3V2O2(PO4)2F-Na3V2(PO4)3@C/AC Bimaterial Electrodes for Hybrid Battery-Capacitor Energy Storage Devices
AU - Akhtar, Mainul
AU - Mitra, Arijit
AU - Chang, Jeng Kuei
AU - Majumder, Subhasish Basu
N1 - Publisher Copyright:
© 2022 The Authors. Published by American Chemical Society.
PY - 2022/4/25
Y1 - 2022/4/25
N2 - In this work, we have reported sol-gel synthesized in situ carbon-coated Na3V2O2(PO4)2F-Na3V2(PO4)3 (NVOPF-NVP@C) composites as excellent cathode materials for hybrid Li-ion batteries (HLIBs). The structure of as-synthesized material enhances the electrochemical performances by reducing the diffusion distance and improving the electrical conductivity and structural stability. In addition, to further improve the rate performance and cycleability, hybridization between NVOPF-NVP@C and supercapacitor-type activated carbon (AC) has been persuaded, and the concept of double hybridization has been introduced. Thus, NVOPF-NVP@C/AC bimaterials demonstrate excellent performances in hybrid battery-capacitor (bat-cap) devices. For example, NVOPF-NVP@C/AC50 can retain 75.2% of its initial capacity with ∼100% Coulombic efficiency at a current density of 1000 mA g-1 even after 2000 repeated charge-discharge cycles. The excellent electrochemical performances of the bimaterial electrodes are mainly attributed to the synergistic interaction between NVOPF-NVP@C and AC, which correlates well with the improvement of electronic conductivity and ionic diffusivity in the electrodes. Thus, these electrodes, thanks to their high capacities and capacity retentions at higher current densities, can play a significant role in the development of high-energy and high-power hybrid bat-cap devices with improved safety and stability.
AB - In this work, we have reported sol-gel synthesized in situ carbon-coated Na3V2O2(PO4)2F-Na3V2(PO4)3 (NVOPF-NVP@C) composites as excellent cathode materials for hybrid Li-ion batteries (HLIBs). The structure of as-synthesized material enhances the electrochemical performances by reducing the diffusion distance and improving the electrical conductivity and structural stability. In addition, to further improve the rate performance and cycleability, hybridization between NVOPF-NVP@C and supercapacitor-type activated carbon (AC) has been persuaded, and the concept of double hybridization has been introduced. Thus, NVOPF-NVP@C/AC bimaterials demonstrate excellent performances in hybrid battery-capacitor (bat-cap) devices. For example, NVOPF-NVP@C/AC50 can retain 75.2% of its initial capacity with ∼100% Coulombic efficiency at a current density of 1000 mA g-1 even after 2000 repeated charge-discharge cycles. The excellent electrochemical performances of the bimaterial electrodes are mainly attributed to the synergistic interaction between NVOPF-NVP@C and AC, which correlates well with the improvement of electronic conductivity and ionic diffusivity in the electrodes. Thus, these electrodes, thanks to their high capacities and capacity retentions at higher current densities, can play a significant role in the development of high-energy and high-power hybrid bat-cap devices with improved safety and stability.
KW - activated carbon
KW - bimaterial electrode
KW - hybrid Li-ion battery
KW - NaVO(PO)F-NaV(PO)@C composite
KW - supercapacitor
UR - http://www.scopus.com/inward/record.url?scp=85128520915&partnerID=8YFLogxK
U2 - 10.1021/acsaem.1c03079
DO - 10.1021/acsaem.1c03079
M3 - Article
AN - SCOPUS:85128520915
SN - 2574-0962
VL - 5
SP - 4070
EP - 4084
JO - ACS Applied Energy Materials
JF - ACS Applied Energy Materials
IS - 4
ER -