Synthesis of Metal Oxides@C (Metal = Ni, Fe) Based Prussian Blue Analogs as a High-performance Anode Material for Lithium-ion Battery

doi:10.1007/s40195-021-01205-5

Abstract

Abstract:

Ni₃[Fe(CN)₆]₂ nano-cubic precursors were prepared by chemical coprecipitation at room temperature with nickel acetate and potassium ferricyanide as raw materials. The corresponding NiFe₂O₄-NiO@C composites with excellent crystallization were prepared by two-stage oxidation at low temperature. The microstructure and electrochemical behavior of the materials showed that the Prussian blue analog was transformed into metal oxide while the carbon coating was maintained in the two-stage oxidation at low temperature. The existence of the carbon coating reduces the charge transfer impedance to 31.5 Ω. At the current density of 500 mA/g, the reversible capacity of 632.7 mAh/g is maintained after 500 cycles. At the same time, carbon cladding can also enhance the role of pseudocapacitance in the material. At the scanning rate of 0.1 mV/s, the pseudocapacitance account for 54.4% of the total discharge capacity, which is significantly higher than that of uncoated materials.

Key words: Lithium-ion battery, Anode materials, Metal oxide, Prussian blue

Wei Yang, Xiaoxian Pang, Zhao Xue, Jinhao Ye, Haosen Fan, Ting Shu, Wenzhi Zheng, Shengzhou Chen. Synthesis of Metal Oxides@C (Metal = Ni, Fe) Based Prussian Blue Analogs as a High-performance Anode Material for Lithium-ion Battery[J]. Acta Metallurgica Sinica (English Letters), 2021, 34(3): 435-443.

Figures/Tables 7

Fig. 1 Preparation process diagram of NiFe2O4-NiO@C composite material with core shell structure

Fig. 2 XRD patterns of NiFe2O4-NiO@C sample

Fig. 3 SEM images: a Ni3[Fe(CN)6]2 precusor, b NiFe2O4-NiO calcined at 600 °C in air; c Ni3[Fe(CN)6]2@PDA precusor; d NiFe2O4-NiO@C obtained through two-stage low-temperature roasting

Fig. 4 Cyclic voltammogram curves of a NiFe2O4-NiO and b NiFe2O4-NiO@C at a scan rate of 0.1 mV/s; c rate cycle test at various current densities; d Nyquist plots and the equivalent circuit used to fit impedance statistics; e charge/discharge voltage profiles of NiFe2O4-NiO@C at 500 mA/g and f cyclability at 500 mA/g

Table 1 EIS spectrum fitting data of NiFe2O4-NiO@C and NiFe2O4-NiO

Samples	R_s (Ω)	CPE-T	CPE-P	R_ct (Ω)	W-R	W-T	W-P
NFO	20.3	3.2 × 10^-5	0.57	365.6	2.4 × 10³	2.8 × 10²	0.48
NFO@C	19.2	5.6 × 10^-7	0.55	32.1	4.2 × 10⁶	7.1 × 10⁵	0.78

Fig. 5 Kinetics information of working electrode, contribution analysis of pseudocapacitance calculation of NiFe2O4-NiO: a cyclic voltammogram curves at various scan rates; b b value calculation; c the fitted CV curves at 0.1 mV/s; d the fitted pseudocapacitance contribution rate at various scan rates

Fig. 6 Kinetics information of working electrode, contribution analysis of pseudocapacitance calculation of NiFe2O4-NiO@C: a cyclic voltammogram curves at different scan rates; b b value calculation; c the fitted CV curves at 0.1 mV/s; d the fitted pseudocapacitance contribution rate at various scan rates

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