Surface-Engineered Black Niobium Oxide@Graphene Nanosheets for High-Performance Sodium-/Potassium-Ion Full Batteries

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)21_Publication in refereed journal

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Detail(s)

Original languageEnglish
Article number1901272
Journal / PublicationSmall
Volume15
Issue number28
Online published4 Jun 2019
Publication statusPublished - 12 Jul 2019

Abstract

Nanoscale surface-engineering plays an important role in improving the performance of battery electrodes. Nb2O5 is one typical model anode material with promising high-rate lithium storage. However, its modest reaction kinetics and low electrical conductivity obstruct the efficient storage of larger ions of sodium or potassium. In this work, partially surface-amorphized and defect-rich black niobium oxide@graphene (black Nb2O5−x@rGO) nanosheets are designed to overcome the above Na/K storage problems. The black Nb2O5−x@rGO nanosheets electrodes deliver a high-rate Na and K storage capacity (123 and 73 mAh g−1, respectively at 3 A g−1) with long-term cycling stability. Besides, both Na-ion and K-ion full batteries based on black Nb2O5−x@rGO nanosheets anodes and vanadate-based cathodes (Na0.33V2O5 and K0.5V2O5 for Na-ion and K-ion full batteries, respectively) demonstrate promising rate and cycling performance. Notably, the K-ion full battery delivers higher energy and power densities (172 Wh Kg−1 and 430 W Kg−1), comparable to those reported in state-of-the-art K-ion full batteries, accompanying with a capacity retention of ≈81.3% over 270 cycles. This result on Na-/K-ion batteries may pave the way to next-generation post-lithium batteries.

Research Area(s)

  • anode materials, Nb2O5, potassium-ion full batteries, sodium-ion full batteries, surface-engineering

Citation Format(s)