• 文献标题:   Conversion/insertion pseudocapacitance-driven vacancy defective perovskite fluorides K0.82Co0.43Mn0.57F2.66@reduced graphene oxide anode for powerful Na-based dual-ion batteries and capacitors
  • 文献类型:   Article
  • 作  者:   TAN CN, DING R, HUANG YF, YAN T, HUANG YX, YANG F, SUN XJ, GAO P, LIU EH
  • 作者关键词:   perovskite fluoride, naion storage, conversion insertion mechanism, vacancy defect, pseudocapacitance
  • 出版物名称:   ELECTROCHIMICA ACTA
  • ISSN:   0013-4686 EI 1873-3859
  • 通讯作者地址:  
  • 被引频次:   3
  • DOI:   10.1016/j.electacta.2021.138713 EA JUN 2021
  • 出版年:   2021

▎ 摘  要

Na-based dual-ion batteries (Na-DIBs) and capacitors (NICs) have received particular attention in the recent years because of the advantages of simple design, environmentally friendly, feasibility, and low cost, etc. Herein, we report a new vacancy defective perovskite fluorides K0.82Co0.43Mn0.57F2.66@reduced graphene oxide (KCMF(1-1)@rGO) nanocrystal as a promising anode material for Na-DIBs and NICs, showing the pseudocapacitance-dominated conversion-insertion hybrid mechanisms. Thanks for the synergistic effect of Co/Mn active species, the fast kinetics of pseudocapacitive behavior, the improved ion storage ability of K-ion vacancy, and the unique K0.82Co0.43Mn0.57F2.66@rGO nano-heterostructures, the KCMF(1-1)@rGO anode exhibits superior specific capacity, rate and cycling behavior (176-84 mAh g(-1) at 0.05-1 A g(-1), 67 % retention/500 cycles/0.3 A g(-1)). Furthermore, the designed Na-DIBs and NICs with the KCMF(1-1)@rGO anode and graphite (KS6)/activated carbon (AC) as cathodes demonstrate remarkable performance, showing the 145.9 Wh kg(-1)/0.83 kW kg(-1)/60%/1000 cycles/5 A g(-1) and 66.51 similar to 29 Wh kg(-1)/0.53 similar to 16.84 kW kg(-1)/81%/1000 cycles/5 A g(-1) for the KCMF(1-1)@rGO//KS6 Na-DIBs and KCMF(1-1)@rGO//AC NICs respectively, indicating a promising application for Na-ion energy storage. (C) 2021 Elsevier Ltd. All rights reserved.