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Kim, Jae-Kwang
YK Research
Research Interests
  • Organic rechargeable batteries
  • Advanced Functional Materials
  • Polymer electrolyte, Lonic liquid, Sodium Batteries
  • New Energy Conversion and Storage

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New chemical route for the synthesis of -Na0.33V2O5 and its fully reversible Li intercalation

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Title
New chemical route for the synthesis of -Na0.33V2O5 and its fully reversible Li intercalation
Author
Kim, Jae-KwangSenthilkumar, BSahgong, Sun HyeKim, Jung-HyunChi, MiaofangKim, Youngsik
Issue Date
2015-04
Publisher
AMER CHEMICAL SOC
Citation
ACS APPLIED MATERIALS & INTERFACES, v.7, no.12, pp.7025 - 7032
Abstract
To obtain good electrochemical performance and thermal stability of rechargeable batteries, various cathode materials have been explored including NaVS2, -Na0.33V2O5, and LixV2O5. In particular, LixV2O5 has attracted attention as a cathode material in Li-ion batteries owing to its large theoretical capacity, but its stable electrochemical cycling (i.e., reversibility) still remains as a challenge and strongly depends on its synthesis methods. In this study, we prepared the LixV2O5 from electrochemical ion exchange of -Na0.33V2O5, which is obtained by chemical conversion of NaVS2 in air at high temperatures. Crystal structure and particle morphology of -Na0.33V2O5 are characterized by using X-ray diffraction, scanning electron microscopy, and transmission electron microscopy techniques. Energy-dispersive X-ray spectroscopy and X-ray photoelectron spectroscopy, in combination with electrochemical data, suggest that Na ions are extracted from -Na0.33V2O5 without irreversible structural collapse and replaced with Li ions during the following intercalation (i.e., charging) process. The thus obtained LixV2O5 delivers a high discharge capacity of 295 mAh g-1, which corresponds to x = 2, with crystal structural stability in the voltage range of 1.5-4.0 V versus. Li, as evidenced by its good cycling performance and high Coulombic efficiency (under 0.1 mA cm-2) at room temperature. Furthermore, the ion-exchanged LixV2O5 from -Na0.33V2O5 shows stable electrochemical behavior without structural collapse, even at a case of deep discharge to 1.5 V versus Li. © 2015 American Chemical Society
URI
https://scholarworks.unist.ac.kr/handle/201301/11365
URL
http://pubs.acs.org/doi/abs/10.1021/acsami.5b01260
DOI
10.1021/acsami.5b01260
ISSN
1944-8244
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