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LiFePO4 Particles Embedded in Fast Bifunctional Conductor rGO&C@Li3V2(PO4)3 Nanosheets as Cathodes for High‐Performance Li‐Ion Hybrid Capacitors

Journal Article


Abstract


  • The sluggish kinetics of Faradaic reactions in bulk electrodes is a significant obstacle to achieve high energy and power density in energy storage devices. Herein, a composite of LiFePO 4 particles trapped in fast bifunctional conductor rGO&C@Li 3 V 2 (PO 4 ) 3 nanosheets is prepared through an in situ competitive redox reaction. The composite exhibits extraordinary rate capability (71 mAh g −1 at 15 A g −1 ) and remarkable cycling stability (0.03% decay per cycle over 1000 cycles at 10 A g −1 ). Improved extrinsic pseudocapacitive contribution is the origin of fast kinetics, which endows this composite with high energy and power density, since the unique 2D nanosheets and embedded ultrafine LiFePO 4 nanoparticles can shorten the ion and electron diffusion length. Even applied to Li-ion hybrid capacitors, the obtained devices still achieve high power density of 3.36 kW kg −1 along with high energy density up to 77.8 Wh kg −1 . Density functional theory computations also validate that the remarkable rate performance is facilitated by the desirable ionic and electronic conductivity of the composite.

Authors


  •   Zhang, Yue (external author)
  •   Zhang, Zihe (external author)
  •   Tang, Yakun (external author)
  •   Jia, Dianzeng (external author)
  •   Haung, Yudai (external author)
  •   Pang, Wei Kong.
  •   Guo, Zaiping
  •   Zhou, Zhen (external author)

Publication Date


  • 2019

Citation


  • Zhang, Y., Zhang, Z., Tang, Y., Jia, D., Haung, Y., Pang, W., Guo, Z. & Zhou, Z. (2019). LiFePO4 Particles Embedded in Fast Bifunctional Conductor rGO&C@Li3V2(PO4)3 Nanosheets as Cathodes for High‐Performance Li‐Ion Hybrid Capacitors. Advanced Functional Materials, 29 (17), 1807895-1-1807895-11.

Scopus Eid


  • 2-s2.0-85062330350

Ro Metadata Url


  • http://ro.uow.edu.au/aiimpapers/3539

Start Page


  • 1807895-1

End Page


  • 1807895-11

Volume


  • 29

Issue


  • 17

Place Of Publication


  • Germany

Abstract


  • The sluggish kinetics of Faradaic reactions in bulk electrodes is a significant obstacle to achieve high energy and power density in energy storage devices. Herein, a composite of LiFePO 4 particles trapped in fast bifunctional conductor rGO&C@Li 3 V 2 (PO 4 ) 3 nanosheets is prepared through an in situ competitive redox reaction. The composite exhibits extraordinary rate capability (71 mAh g −1 at 15 A g −1 ) and remarkable cycling stability (0.03% decay per cycle over 1000 cycles at 10 A g −1 ). Improved extrinsic pseudocapacitive contribution is the origin of fast kinetics, which endows this composite with high energy and power density, since the unique 2D nanosheets and embedded ultrafine LiFePO 4 nanoparticles can shorten the ion and electron diffusion length. Even applied to Li-ion hybrid capacitors, the obtained devices still achieve high power density of 3.36 kW kg −1 along with high energy density up to 77.8 Wh kg −1 . Density functional theory computations also validate that the remarkable rate performance is facilitated by the desirable ionic and electronic conductivity of the composite.

Authors


  •   Zhang, Yue (external author)
  •   Zhang, Zihe (external author)
  •   Tang, Yakun (external author)
  •   Jia, Dianzeng (external author)
  •   Haung, Yudai (external author)
  •   Pang, Wei Kong.
  •   Guo, Zaiping
  •   Zhou, Zhen (external author)

Publication Date


  • 2019

Citation


  • Zhang, Y., Zhang, Z., Tang, Y., Jia, D., Haung, Y., Pang, W., Guo, Z. & Zhou, Z. (2019). LiFePO4 Particles Embedded in Fast Bifunctional Conductor rGO&C@Li3V2(PO4)3 Nanosheets as Cathodes for High‐Performance Li‐Ion Hybrid Capacitors. Advanced Functional Materials, 29 (17), 1807895-1-1807895-11.

Scopus Eid


  • 2-s2.0-85062330350

Ro Metadata Url


  • http://ro.uow.edu.au/aiimpapers/3539

Start Page


  • 1807895-1

End Page


  • 1807895-11

Volume


  • 29

Issue


  • 17

Place Of Publication


  • Germany