Prussian Blue Cathode Materials for Aqueous Sodium-ion Batteries:Preparation and Electrochemical Performance

doi:10.15541/jim20180272

Abstract

Abstract:

Prussian blue (PB) is a kind of metal-organic framework complex that displays wide application prospect as cathode material for aqueous sodium-ion batteries. In this study, PB composites were prepared by a single source method. Furthermore, effects of reaction temperature, time and concentration of hydrochloric acid on PB morphology and electrochemical performance were systematically investigated. The results showed that crystallinity and electrochemical stability of PB were improved by increasing reaction temperature. The aqueous sodium-ion battery with PB synthesized at 80 ℃ as cathode material displayed a capacity retention of 93.9% after 100 cycles. The particle size of PB grew with the extension of reaction time until 6 h. It’s exhibited that the extended reaction time was beneficial to the cycle performance of device fabricated with PB prepared for 10 h, delivering 90% capacity retention after 100 cycles. Increment of the hydrochloric concentration acid changed the surface morphology, and thus improved electrochemical performance of PB. When the concentration of hydrochloric acid reached 0.20 mol/L, a capacity of 67.5 mAh/g could be maintainted after 100 discharge-charge. This work may provide theoretical and experimental gaidence for preparing high performance PB-based aqueous sodium-ion batteries.

Key words: aqueous sodium-ion battery, single source method, Prussian blue, cycle performance

CLC Number:

TM912

Yong LI, Wei-Xin HE, Xin-Yue ZHENG, Sheng-Lan YU, Hai-Tong LI, Hong-Yi LI, Rong ZHANG, Yu WANG. Prussian Blue Cathode Materials for Aqueous Sodium-ion Batteries:Preparation and Electrochemical Performance[J]. Journal of Inorganic Materials, 2019, 34(4): 365-372.

Figures/Tables 19

Fig. 1 Diagram of PB precipitation mechanism

Fig. 2 XRD patterns of PB synthesized at different reaction temperatures

Fig. 3 (a-e) SEM and (f) TEM images of PB synthesized at different reaction temperatures

Fig. 4 Yield curve of PB synthesized at different reaction temperatures

Fig. 5 Charge/discharge curves of batteries based on PB synthesized at different reaction temperatures

Fig. 6 Cycle performances of batteries based on PB synthesized at different reaction temperatures

Fig. 7 Rate performances of batteries based on PB synthesized at different reaction temperatures

Fig. 8 XRD patterns of PB synthesized with different reaction time

Fig. 9 SEM images of PB synthesized with different reaction time

Fig. 10 (a) Particle size and (b) yield curves of PB synthesized with different reaction time

Fig. 11 Charge/discharge curves of batteries based on PB synthesized with different reaction time

Fig. 12 Cycle performances of batteries based on PB synthesized with different reaction time

Fig. 13 Rate performances of batteries based on PB synthesized with different reaction times

Fig. 14 XRD patterns of PB synthesized at different concentrations of hydrochloric acid

Fig. 15 SEM images of PB synthesized at different concentrations of hydrochloric acid

Fig. 16 Yield curve of PB synthesized at different concentrations of hydrochloric acid

Fig. 17 Charge/discharge curves of batteries based on PB synthesized at different concentrations of hydrochloric acid

Fig. 18 Cycle performances of batteries based on PB synthesized at different concentrations of hydrochloric acid

Fig. 19 Rate performances of batteries based on PB synthesized at different concentrations of hydrochloric acid

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