期刊
ACS APPLIED MATERIALS & INTERFACES
卷 8, 期 25, 页码 16078-16086出版社
AMER CHEMICAL SOC
DOI: 10.1021/acsami.6b04151
关键词
sodium-ion batteries; cathode materials; Prussian blue; structural optimization; porous submicron cubes
资金
- National Natural Science Foundation of China [21373028]
- Major Achievements Transformation Project for Central University in Beijing
- National Key Program for Basic Research of China [2015CB251100]
- Beijing Science and Technology Project [D151100003015001]
Traditional Prussian blue (Fe-4[Fe(CN)(6)](3)) synthesized by simple rapid precipitation shows poor electrochemical performance because of the presence of vacancies occupied by coordinated water. When the precipitation rate is reduced and polyvinylpyrrolidone K-30 is added as a surface active agent, the as-prepared Prussian blue has fewer vacancies in the crystal structure than in that of traditional Prussian blue. It has a well-defined face-centered-cubic structure, which can provide large channels for Na+ insertion/extraction. The material, synthesized by slow precipitation, has an initial discharge capacity of 113 mA h g(-1) and maintains 93 mA h g(-1) under a current density of 50 mA g(-1) after 150 charge-discharge cycles. After further optimization by a chemical etching method, the complex nanoporous structure of Prussian blue has a high Brunauer-Emmett-Teller surface area and a stable structure to achieve high specific capacity and long cycle life. Surprisingly, the electrode shows an initial discharge capacity of 115 mA h g(-1) and a Coulombic efficiency of approximately 100% with capacity retention of 96% after 150 cycles. Experimental results show that Prussian blue can also be used as a cathode for Na-ion batteries.
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