Effect of Particle Size and Anion Vacancy on Electrochemical Potassium Ion Insertion into Potassium Manganese Hexacyanoferrates

被引:47
作者
Hosaka, Tomooki [1 ]
Fukabori, Taiga [1 ]
Kojima, Haruka [1 ]
Kubota, Kei [1 ,2 ]
Komaba, Shinichi [1 ,2 ]
机构
[1] Tokyo Univ Sci, Dept Appl Chem, Shinjuku Ku, Tokyo 1628601, Japan
[2] Kyoto Univ, Elements Strategy Initiat Catalysts & Batteries E, Nishikyo Ku, Kyoto 6158245, Japan
关键词
batteries; insertion materials; ionic diffusion; potassium; Prussian blue analogues; INTERMITTENT TITRATION TECHNIQUE; PRUSSIAN WHITE ANALOGS; K-ION; SUPERIOR CATHODE; 3-DIMENSIONAL VISUALIZATION; BLUE ANALOGS; LI; INTERCALATION; BATTERIES; CELLS;
D O I
10.1002/cssc.202002628
中图分类号
O6 [化学];
学科分类号
0703 ;
摘要
Potassium manganese hexacyanoferrate (KMnHCF) can be used as a positive electrode for potassium-ion batteries because of its high energy density. The effect of particle size and [Fe(CN)(6)](n-) vacancies on the electrochemical potassium insertion of KMnHCFs was examined through experimental data and theoretical calculations. When nearly stoichiometric KMnHCF was synthesized and tested, smaller particle sizes were found to be important for achieving superior electrochemical performance in terms of capacity and rate capability. However, even in the case of larger particles, introducing a suitable number of anion vacancies enabled KMnHCF to exhibit comparable electrode performance. Electrochemical tests and density functional theory calculations indicated that anion vacancies contribute to the enhancement of K+ ion diffusion, which realizes good electrochemical performance. Structural design, including crystal vacancies and particle size, is the key to their high performance as a positive electrode.
引用
收藏
页码:1166 / 1175
页数:10
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