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Song, Hyun-Kon
eclat: ElectroChemistry Lab of Advanced Technology
Research Interests
  • Electrochemical analysis, electroactive materials, electrochemistry-based energy devices

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Optimized evolution of a secondary structure of LiFePO4: balancing between shape and impurities

Cited 3 times inthomson ciCited 3 times inthomson ci
Title
Optimized evolution of a secondary structure of LiFePO4: balancing between shape and impurities
Author
Lee, Myeong-HeeKim, Tae-HeeKim, Young SooPark, Jeong-SeokSong, Hyun-Kon
Keywords
Cathode materials; High rate discharges; Hollow structure; Hydrothermal treatments; Kinetically controlled; LiFePO; Precipitation methods; Primary particles; Secondary structures; Solubility product; Thermodynamic process
Issue Date
201205
Publisher
ROYAL SOC CHEMISTRY
Citation
JOURNAL OF MATERIALS CHEMISTRY, v.22, no.17, pp.8228 - 8234
Abstract
The kinetically helpful hollow secondary structure of LiFePO4 olivine (LFP) was optimized by a balance between its impurities and shape. In a thermodynamic process using hydrothermal treatment (+HyT), a relatively small amount of hollow structure was developed without any impurities by a sequential precipitation method using the difference of the solubility products (K-sp) between two precipitates (Li3PO4 and Fe-3(PO4)(2)). On the other hand, a kinetically controlled process without hydrothermal treatment (-HyT) produced the opposite result of a greater amount of hollow structure with impurities (Li3PO4). By removing the LFP impurities from the latter process (-HyT*), therefore, optimized hollow LFP was obtained without impurities. The resultant cathode material showed enhanced capacities, especially at high rate discharges, due to the improved accessibility of ions into the primary particles of the hollow secondary structure of LFP.
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DOI
http://dx.doi.org/10.1039/c2jm30403a
ISSN
0959-9428
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