Journal
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
Volume 46, Issue 5, Pages 4252-4258Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.ijhydene.2020.10.260
Keywords
Prussian blue analogue; Hollow structure; Synergistic effect; Sodium ions battery
Categories
Funding
- National Natural Science Foundation of China [52002216, 51872161]
- Natural Science Foundation of Shandong Province [ZR2017ZB0316]
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In this study, a potassium ions stabilized hollow Mn-based Prussian blue analogue is synthesized for use as a cathode in sodium-ions batteries, showing high reversible specific capacity and superior rate performance due to its stable structure and enhanced sodium ions transport kinetics.
Mn-based Prussian blue analogue is regarded as one of the promising cathodes for sodium ions battery owing to its high theoretical capacity and low cost. However, the unstable structure during charging/discharging process and the poor cycle life hinder its commercial application. In this work, potassium ions stabilized hollow Mn-based Prussian blue analogue is synthesized through a simple sodium citrate assisted method using for cathode of sodium-ions batteries. Although unique hollow structure could suffer volume variation during charging/discharging process, the K+ is introduced to further stabilize its structure. The PBAs cathode exhibits a high reversible specific capacity of 128 mA h g(-1) at 50 mA and superior rate performance of 72 mA h g(-1) at a high current density of 3200 mA g(-1), which is attributed to its stable structure and enhanced sodium ions transport kinetics. Ex-situ XRD/Raman tests and electrochemical measurements further prove the synergistic effect of various alkali ions (K+/Na+) and unique hollow structure. They work together to improve the structural stability and promote sodium ions diffusion rate of Mn-based PBAs. (C) 2020 Hydrogen Energy Publications LLC. Published by Elsevier Ltd. All rights reserved.
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