Journal of Inorganic Materials ›› 2019, Vol. 34 ›› Issue (12): 1301-1308.DOI: 10.15541/jim20190076

Special Issue: 离子电池材料

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High-quality Fe4[Fe(CN)6]3 Nanocubes: Synthesis and Electrochemical Performance as Cathode Material for Aqueous Sodium-ion Battery

WANG Wu-Lian1,2,ZHANG Jun2,WANG Qiu-Shi2,CHEN Liang2,LIU Zhao-Ping2()   

  1. 1. College of Materials Science and Engineering, Kunming University of Science and Technology, Kunming 650000, China
    2. Advanced Li-ion Battery Engineering Lab, Ningbo Institute of Materials Technology and Engineering, Chinese Academy of Sciences, Ningbo 315201, China
  • Received:2019-02-22 Revised:2019-04-08 Published:2019-12-20 Online:2019-05-29
  • Supported by:
    Youth Innovation Promotion Association CAS(2017341)

Abstract:

High-quality Fe4[Fe(CN)6]3 (HQ-FeHCF) nanocubes were synthesized by a simple hydrothermal method. Its structure, morphology and water content are characterized. Fe4[Fe(CN)6]3 exhibits regular cubic shape with a uniform size of ca. 500 nm, which belongs to the face-centered cubic phase. Fe4[Fe(CN)6]3 shows discharge capacities of 124, 118, 105, 94, 83, 74 and 64 mAh·g -1 at 1C, 2C, 5C, 10C, 20C, 30C and 40C rate, respectively, in the aqueous ternary electrolyte of NaClO4-H2O-Polyethylene glycol. Its capacity retention remains 100% after 500 charge/discharge cycles at the rate of 5C. The full battery with Fe4[Fe(CN)6]3 as cathode and NaTi2(PO4)3 as anode was fabricated, which delivers a specific energy density of 126 Wh·kg -1 (based on the active electrode materials) with a voltage output of 1.9 V. Furthermore, 92% of its initial discharge capacity retains after 140 charge/discharge cycles at a rate of 5C, and its Coulomb efficiency is close to 100%.

Key words: aqueous sodium-ion battery, cathode material, cubic structure, energy density

CLC Number: