The development of anodes with fast electron and ion
transport
is indispensable for high-performance lithium-ion capacitors (LICs).
In this work, we have successfully incorporated chemically exfoliated
HNb3O8 nanosheets (E-HNb3O8) into PEDOT aerogel by electrostatic interactions between the negatively
charged E-HNb3O8 and positively charged PEDOT:PSS
through a facile hydrothermal method. The E-HNb3O8 nanosheets with shortened ion diffusion lengths offer numerous active
sites, while the interconnected PEDOT skeleton offers continuous and
conductive pathways for rapid electron and ion transport. Thereby,
the PEDOT-E-HNb3O8 aerogel (PDT-Nb) exhibits
large specific capacity (217 mAh g–1 at 0.1 A g–1), good rate capability (63 mAh g–1 at 1.0 A g–1), and decent cycling stability (153
mAh g–1 after 160 cycles at 0.1 A g–1). The LIC fabricated with PDT-Nb50 as the anode and activated carbon
as the cathode provides a maximum energy density of 64 Wh kg–1, while retaining 66% capacity and almost 100% Coulombic efficiency
over 5000 cycles at 1.0 A g–1. Our work demonstrates
that the PEDOT-E-HNb3O8 aerogel holds great
potential as an anode for the lithium-ion hybrid capacitor.