Cage-like porous prussian blue as high-capacity cathode for sodium-ion batteries

Document Type

Article

Publication Date

3-22-2022

Abstract

Fast charge-discharge rate sodium-ion batteries (SIBs) can be considered as an ideal alternative candidate to lithium-ion batteries (LIBs) for low-cost and large-scale application. Prussian blue and its analogues (abbreviated as PB) as a cathode material for SIBs were proposed due to the similar working mechanisms with LIBs. However, the early synthesized PBs have suffered capacity fading at long cycles of charge/discharge and high C-rate. In this work, we synthesized a cage-like porous cubic structure (PB-C) via a simple single iron source precipitation method with a reheating process and acid etching. The galvanostatic charge-discharge measurements have shown that a high specific capacity could be maintained at a high C-rate. At 0.2 C, the specific capacity is 112 mA h g(-1), while at 10 C, the specific capacity is 97 mA h g(-1). Also, PB-C showed no obvious capacity fading at the 1000th cycle with more than 85% capacity retention. Cyclic voltammetry analysis at various scan rates proved that the nanoporous structure with a superior specific surface area carries the pseudocapacitance effect, leading to the excellent electrochemical performance. This exceptional performance discloses that the as-prepared cage-like porous PB is one of the potential candidates as a cathode material in low-cost and large-scale applications for practical SIBs.

Keywords

Sodium ion batteries, Cathode, Prussian blue, Porous structure, Pseudocapacitance

Publication Title

ACS Applied Nano Materials

Divisions

PHYSICS

Funders

Ministry of Higher Education of Malaysia FRGS grant [Grant No:FP085-2018A],Universiti Malaya [Grant No:GPF 038B-2018]

Volume

5

Issue

4

Publisher

Amer Chemical Soc

Publisher Location

1155 16TH ST, NW, WASHINGTON, DC 20036 USA

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