Open AccessIn situ polyaniline coating of Prussian blue as cathode material for sodium-ion battery
Author(s) -
Yu Luo,
Lei Yang,
Qing Liu,
Yunjun Yan
Publication year - 2021
Publication title -
royal society open science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.84
H-Index - 51
ISSN - 2054-5703
DOI - 10.1098/rsos.211092
Subject(s) - prussian blue , polyaniline , materials science , cathode , electrochemistry , coating , anode , chemical engineering , electrolyte , ascorbic acid , in situ polymerization , electrode , polymerization , nanotechnology , composite material , chemistry , polymer , food science , engineering
Prussian blue (PB) has great potential for use as a sodium cathode material owing to its high working potential and cube frame structure. Herein, this work reports a two-step method to synthesize PB with ascorbic acid as the ball-milling additive, which improves the electrochemical rate performance of PB during the traditional co-precipitation method. The obtained PB sample exhibited a superior specific capability (113.3 mAh g −1 even at 20 C, 1 C = 170 mA g −1 ) and a specific capacity retention of 84.8% after 100 cycles at 1 C rate. In order to enhance the cycling performance of the PB, an in situ polyaniline coating strategy was employed in which aniline was added into the electrolyte and polymerized under electrochemical conditions. The coated anode exhibited a high specific capacity retention of 62.7% after 500 cycles, which is significantly higher than that of the non-coated sample, which only remains 40.1% after 500 cycles. This development has shown a great potential as a low-cost, high-performance and environment-friendly technology for large-scale industrial application of PB.