Optimization of synthesis conditions of high-tap density FeVO4 hollow microspheres via spray pyrolysis for lithium-ion batteries

Title
Optimization of synthesis conditions of high-tap density FeVO4 hollow microspheres via spray pyrolysis for lithium-ion batteries
Authors
나인욱김형석파이잔 가니아시프 라자경대승임종주
Issue Date
2019-12
Publisher
Applied surface science
Citation
VOL 497-143727
Abstract
Iron orthovanadate (FeVO4) hollow microspheres were synthesized by a continuous, one– step, scalable process without the addition of a template material using the ultrasonic spray pyrolysis method. The synthesis conditions were optimized by changing the synthesis temperature in order to synthesize hollow microspheres of FeVO4 under the constant N2 gas atmosphere by means of a tubular furnace. The pure crystalline phase of hollow microspheres was achieved at 800  °C, and investigated using XRD, RAMAN, SEM, TEM. The electrochemical performance of hollow microspheres was considered with initial specific discharge/charge capacities of 1373.82  mA  h  g− 1, 1107.28  1, and an initial columbic efficiency of 80.59% at 0.1 C up to 100  cycles. Superior rate capability and cycle retention performance were due to the FeVO4 hollow microsphere morphology and high tap density, which improved the electrical contact between the electrolyte, active material, and current collector and shortened the diffusion length of Li+ ions during the intercalation/de– intercalation process. Moreover, electrical impedance spectroscopic measurements explained that the enhanced ionic conductivity was due to the morphology and porosity which improved the electrochemical performance of FeVO4 hollow microspheres and proved it as an auspicious anode material for LIBs.
URI
http://pubs.kist.re.kr/handle/201004/70087
ISSN
0169-4332
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KIST Publication > Article
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